Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

41 files changed, 14933 insertions, 0 deletions

diff --git a/ucb/source/ucp/webdav-curl/ContentProperties.cxx b/ucb/source/ucp/webdav-curl/ContentProperties.cxx
new file mode 100644
index 000000000..d78d138ab
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/ContentProperties.cxx
@@ -0,0 +1,566 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <memory>
+#include <com/sun/star/util/DateTime.hpp>
+#include "CurlUri.hxx"
+#include "DAVResource.hxx"
+#include "DAVProperties.hxx"
+#include "DateTimeHelper.hxx"
+#include "webdavprovider.hxx"
+#include "ContentProperties.hxx"
+
+using namespace com::sun::star;
+using namespace http_dav_ucp;
+
+/*
+=============================================================================
+
+                            Property Mapping
+
+=============================================================================
+HTTP (entity header)    WebDAV (property)   UCB (property)
+=============================================================================
+
+Allow
+Content-Encoding
+Content-Language        getcontentlanguage
+Content-Length          getcontentlength    Size
+Content-Location
+Content-MD5
+Content-Range
+Content-Type            getcontenttype      MediaType
+Expires
+Last-Modified           getlastmodified     DateModified
+                        creationdate        DateCreated
+                        resourcetype        IsFolder,IsDocument,ContentType
+                        displayname
+ETag (actually          getetag
+a response header )
+                        lockdiscovery
+                        supportedlock
+                        source
+                                            Title (always taken from URI)
+
+=============================================================================
+
+Important: HTTP headers will not be mapped to DAV properties; only to UCB
+           properties. (Content-Length,Content-Type,Last-Modified)
+*/
+
+
+// ContentProperties Implementation.
+
+
+// static member!
+uno::Any ContentProperties::m_aEmptyAny;
+
+ContentProperties::ContentProperties( const DAVResource& rResource )
+: m_xProps( new PropertyValueMap ),
+  m_bTrailingSlash( false )
+{
+    assert(!rResource.uri.isEmpty() &&
+                "ContentProperties ctor - Empty resource URI!");
+
+    // Title
+    try
+    {
+        CurlUri const aURI( rResource.uri );
+        m_aEscapedTitle = aURI.GetPathBaseName();
+
+        (*m_xProps)[ OUString( "Title" ) ]
+            = PropertyValue(
+                uno::Any( aURI.GetPathBaseNameUnescaped() ), true );
+    }
+    catch ( DAVException const & )
+    {
+        (*m_xProps)[ OUString( "Title" ) ]
+            = PropertyValue(
+                uno::Any(
+                    OUString( "*** unknown ***" ) ),
+                true );
+    }
+
+    for ( const auto& rProp : rResource.properties )
+    {
+        addProperty( rProp );
+    }
+
+    if ( rResource.uri.endsWith("/") )
+        m_bTrailingSlash = true;
+}
+
+
+ContentProperties::ContentProperties(
+                        const OUString & rTitle, bool bFolder )
+: m_xProps( new PropertyValueMap ),
+  m_bTrailingSlash( false )
+{
+    (*m_xProps)[ OUString( "Title" ) ]
+        = PropertyValue( uno::Any( rTitle ), true );
+    (*m_xProps)[ OUString( "IsFolder" ) ]
+        = PropertyValue( uno::Any( bFolder ), true );
+    (*m_xProps)[ OUString( "IsDocument" ) ]
+        = PropertyValue( uno::Any( bool( !bFolder ) ), true );
+}
+
+
+ContentProperties::ContentProperties( const OUString & rTitle )
+: m_xProps( new PropertyValueMap ),
+  m_bTrailingSlash( false )
+{
+    (*m_xProps)[ OUString( "Title" ) ]
+        = PropertyValue( uno::Any( rTitle ), true );
+}
+
+
+ContentProperties::ContentProperties()
+: m_xProps( new PropertyValueMap ),
+  m_bTrailingSlash( false )
+{
+}
+
+
+ContentProperties::ContentProperties( const ContentProperties & rOther )
+: m_aEscapedTitle( rOther.m_aEscapedTitle ),
+  m_xProps( rOther.m_xProps
+            ? new PropertyValueMap( *rOther.m_xProps )
+            : new PropertyValueMap ),
+  m_bTrailingSlash( rOther.m_bTrailingSlash )
+{
+}
+
+
+bool ContentProperties::contains( const OUString & rName ) const
+{
+    if ( get( rName ) )
+        return true;
+    else
+        return false;
+}
+
+
+const uno::Any & ContentProperties::getValue(
+                                    const OUString & rName ) const
+{
+    const PropertyValue * pProp = get( rName );
+    if ( pProp )
+        return pProp->value();
+    else
+        return m_aEmptyAny;
+}
+
+
+const PropertyValue * ContentProperties::get(
+                                    const OUString & rName ) const
+{
+    PropertyValueMap::const_iterator it = m_xProps->find( rName );
+    const PropertyValueMap::const_iterator end = m_xProps->end();
+
+    if ( it == end )
+    {
+        it = std::find_if(m_xProps->cbegin(), end,
+            [&rName](const PropertyValueMap::value_type& rEntry) {
+                return rEntry.first.equalsIgnoreAsciiCase( rName );
+            });
+        if ( it != end )
+            return &(*it).second;
+
+        return nullptr;
+    }
+    else
+        return &(*it).second;
+}
+
+
+// static
+void ContentProperties::UCBNamesToDAVNames(
+                            const uno::Sequence< beans::Property > & rProps,
+                            std::vector< OUString > & propertyNames )
+{
+
+    // Assemble list of DAV properties to obtain from server.
+    // Append DAV properties needed to obtain requested UCB props.
+
+
+    //       DAV              UCB
+    // creationdate     <- DateCreated
+    // getlastmodified  <- DateModified
+    // getcontenttype   <- MediaType
+    // getcontentlength <- Size
+    // resourcetype     <- IsFolder, IsDocument, ContentType
+    // (taken from URI) <- Title
+
+    bool bCreationDate  = false;
+    bool bLastModified  = false;
+    bool bContentType   = false;
+    bool bContentLength = false;
+    bool bResourceType  = false;
+
+    sal_Int32 nCount = rProps.getLength();
+    for ( sal_Int32 n = 0; n < nCount; ++n )
+    {
+        const beans::Property & rProp = rProps[ n ];
+
+        if ( rProp.Name == "Title" )
+        {
+            // Title is always obtained from resource's URI.
+            continue;
+        }
+        else if ( rProp.Name == "DateCreated" ||
+                  ( rProp.Name == DAVProperties::CREATIONDATE ) )
+        {
+            if ( !bCreationDate )
+            {
+                propertyNames.push_back( DAVProperties::CREATIONDATE );
+                bCreationDate = true;
+            }
+        }
+        else if ( rProp.Name == "DateModified" ||
+                  ( rProp.Name == DAVProperties::GETLASTMODIFIED ) )
+        {
+            if ( !bLastModified )
+            {
+                propertyNames.push_back(
+                    DAVProperties::GETLASTMODIFIED );
+                bLastModified = true;
+            }
+        }
+        else if ( rProp.Name == "MediaType" ||
+                  ( rProp.Name == DAVProperties::GETCONTENTTYPE ) )
+        {
+            if ( !bContentType )
+            {
+                propertyNames.push_back(
+                        DAVProperties::GETCONTENTTYPE );
+                bContentType = true;
+            }
+        }
+        else if ( rProp.Name == "Size" ||
+                  ( rProp.Name == DAVProperties::GETCONTENTLENGTH ) )
+        {
+            if ( !bContentLength )
+            {
+                propertyNames.push_back(
+                    DAVProperties::GETCONTENTLENGTH );
+                bContentLength = true;
+            }
+        }
+        else if ( rProp.Name == "ContentType" ||
+                  rProp.Name == "IsDocument" ||
+                  rProp.Name == "IsFolder" ||
+                  ( rProp.Name == DAVProperties::RESOURCETYPE ) )
+        {
+            if ( !bResourceType )
+            {
+                propertyNames.push_back( DAVProperties::RESOURCETYPE );
+                bResourceType = true;
+            }
+        }
+        else
+        {
+            propertyNames.push_back( rProp.Name );
+        }
+    }
+}
+
+
+// static
+void ContentProperties::UCBNamesToHTTPNames(
+                            const uno::Sequence< beans::Property > & rProps,
+                            std::vector< OUString > & propertyNames )
+{
+
+    // Assemble list of HTTP header names to obtain from server.
+    // Append HTTP headers needed to obtain requested UCB props.
+
+
+    //       HTTP              UCB
+    // Last-Modified  <- DateModified
+    // Content-Type   <- MediaType
+    // Content-Length <- Size
+
+    sal_Int32 nCount = rProps.getLength();
+    for ( sal_Int32 n = 0; n < nCount; ++n )
+    {
+        const beans::Property & rProp = rProps[ n ];
+
+        if ( rProp.Name == "DateModified" )
+        {
+            propertyNames.push_back( OUString( "Last-Modified" ) );
+        }
+        else if ( rProp.Name == "MediaType" )
+        {
+            propertyNames.push_back( OUString( "Content-Type" ) );
+        }
+        else if ( rProp.Name == "Size" )
+        {
+            propertyNames.push_back( OUString( "Content-Length" ) );
+        }
+        else
+        {
+            propertyNames.push_back( rProp.Name );
+        }
+    }
+}
+
+
+bool ContentProperties::containsAllNames(
+                    const uno::Sequence< beans::Property >& rProps,
+                    std::vector< OUString > & rNamesNotContained ) const
+{
+    rNamesNotContained.clear();
+
+    sal_Int32 nCount = rProps.getLength();
+    for ( sal_Int32 n = 0; n < nCount; ++n )
+    {
+        const OUString & rName = rProps[ n ].Name;
+        if ( !contains( rName ) )
+        {
+            // Not found.
+            rNamesNotContained.push_back( rName );
+        }
+    }
+
+    return ( rNamesNotContained.size() == 0 );
+}
+
+
+void ContentProperties::addProperties(
+                                const std::vector< OUString > & rProps,
+                                const ContentProperties & rContentProps )
+{
+    for ( const OUString & rName : rProps )
+    {
+        if ( !contains( rName ) ) // ignore duplicates
+        {
+            const PropertyValue * pProp = rContentProps.get( rName );
+            if ( pProp )
+            {
+                // Add it.
+                addProperty( rName, pProp->value(), pProp->isCaseSensitive() );
+            }
+            else
+            {
+                addProperty( rName, uno::Any(), false );
+            }
+        }
+    }
+}
+
+void ContentProperties::addProperty( const DAVPropertyValue & rProp )
+{
+    addProperty( rProp.Name, rProp.Value, rProp.IsCaseSensitive );
+}
+
+
+void ContentProperties::addProperty( const OUString & rName,
+                                     const css::uno::Any & rValue,
+                                     bool bIsCaseSensitive )
+{
+    if ( rName == DAVProperties::CREATIONDATE )
+    {
+        // Map DAV:creationdate to UCP:DateCreated
+        OUString aValue;
+        rValue >>= aValue;
+        util::DateTime aDate;
+        DateTimeHelper::convert( aValue, aDate );
+
+        (*m_xProps)[ OUString( "DateCreated" ) ]
+            = PropertyValue( uno::Any( aDate ), true );
+    }
+    //  else if ( rName.equals( DAVProperties::DISPLAYNAME ) )
+    //  {
+    //  }
+    //  else if ( rName.equals( DAVProperties::GETCONTENTLANGUAGE ) )
+    //  {
+    //  }
+    else if ( rName == DAVProperties::GETCONTENTLENGTH )
+    {
+        // Map DAV:getcontentlength to UCP:Size
+        OUString aValue;
+        rValue >>= aValue;
+
+        (*m_xProps)[ OUString( "Size" ) ]
+            = PropertyValue( uno::Any( aValue.toInt64() ), true );
+    }
+    else if ( rName.equalsIgnoreAsciiCase( "Content-Length" ) )
+    {
+        // Do NOT map Content-Length entity header to DAV:getcontentlength!
+        // Only DAV resources have this property.
+
+        // Map Content-Length entity header to UCP:Size
+        OUString aValue;
+        rValue >>= aValue;
+
+        (*m_xProps)[ OUString( "Size" ) ]
+            = PropertyValue( uno::Any( aValue.toInt64() ), true );
+    }
+    else if ( rName == DAVProperties::GETCONTENTTYPE )
+    {
+        // Map DAV:getcontenttype to UCP:MediaType (1:1)
+        (*m_xProps)[ OUString( "MediaType" ) ]
+            = PropertyValue( rValue, true );
+    }
+    else if ( rName.equalsIgnoreAsciiCase( "Content-Type" ) )
+    {
+        // Do NOT map Content-Type entity header to DAV:getcontenttype!
+        // Only DAV resources have this property.
+
+        // Map DAV:getcontenttype to UCP:MediaType (1:1)
+        (*m_xProps)[ OUString( "MediaType" ) ]
+            = PropertyValue( rValue, true );
+    }
+    //  else if ( rName.equals( DAVProperties::GETETAG ) )
+    //  {
+    //  }
+    else if ( rName == DAVProperties::GETLASTMODIFIED )
+    {
+        // Map the DAV:getlastmodified entity header to UCP:DateModified
+        OUString aValue;
+        rValue >>= aValue;
+        util::DateTime aDate;
+        DateTimeHelper::convert( aValue, aDate );
+
+        (*m_xProps)[ OUString( "DateModified" ) ]
+            = PropertyValue( uno::Any( aDate ), true );
+    }
+    else if ( rName.equalsIgnoreAsciiCase( "Last-Modified" ) )
+    {
+        // Do not map Last-Modified entity header to DAV:getlastmodified!
+        // Only DAV resources have this property.
+
+        // Map the Last-Modified entity header to UCP:DateModified
+        OUString aValue;
+        rValue >>= aValue;
+        util::DateTime aDate;
+        DateTimeHelper::convert( aValue, aDate );
+
+        (*m_xProps)[ OUString( "DateModified" ) ]
+            = PropertyValue( uno::Any( aDate ), true );
+    }
+    //  else if ( rName.equals( DAVProperties::LOCKDISCOVERY ) )
+    //  {
+    //  }
+    else if ( rName == DAVProperties::RESOURCETYPE )
+    {
+        OUString aValue;
+        rValue >>= aValue;
+
+        // Map DAV:resourcetype to UCP:IsFolder, UCP:IsDocument, UCP:ContentType
+        bool bFolder =
+            aValue.equalsIgnoreAsciiCase( "collection" );
+
+        (*m_xProps)[ OUString( "IsFolder" ) ]
+            = PropertyValue( uno::Any( bFolder ), true );
+        (*m_xProps)[ OUString( "IsDocument" ) ]
+            = PropertyValue( uno::Any( bool( !bFolder ) ), true );
+        (*m_xProps)[ OUString( "ContentType" ) ]
+            = PropertyValue( uno::Any( bFolder
+                ? OUString( WEBDAV_COLLECTION_TYPE )
+                : OUString( WEBDAV_CONTENT_TYPE ) ), true );
+    }
+    //  else if ( rName.equals( DAVProperties::SUPPORTEDLOCK ) )
+    //  {
+    //  }
+
+    // Save property.
+    (*m_xProps)[ rName ] = PropertyValue( rValue, bIsCaseSensitive );
+}
+
+
+// CachableContentProperties Implementation.
+
+
+namespace
+{
+    bool isCachable( OUString const & rName,
+                     bool isCaseSensitive )
+    {
+        const OUString aNonCachableProps [] =
+        {
+            DAVProperties::LOCKDISCOVERY,
+
+            DAVProperties::GETETAG,
+            OUString( "ETag" ),
+
+            OUString( "DateModified" ),
+            OUString( "Last-Modified" ),
+            DAVProperties::GETLASTMODIFIED,
+
+            OUString( "Size" ),
+            OUString( "Content-Length" ),
+            DAVProperties::GETCONTENTLENGTH,
+
+            OUString( "Date" )
+        };
+
+        for ( sal_uInt32 n = 0;
+              n <  ( sizeof( aNonCachableProps )
+                     / sizeof( aNonCachableProps[ 0 ] ) );
+              ++n )
+        {
+            if ( isCaseSensitive )
+            {
+                if ( rName.equals( aNonCachableProps[ n ] ) )
+                    return false;
+            }
+            else
+                if ( rName.equalsIgnoreAsciiCase( aNonCachableProps[ n ] ) )
+                    return false;
+        }
+        return true;
+    }
+
+} // namespace
+
+
+CachableContentProperties::CachableContentProperties(
+    const ContentProperties & rProps )
+{
+    addProperties( rProps );
+}
+
+
+void CachableContentProperties::addProperties(
+    const ContentProperties & rProps )
+{
+    const std::unique_ptr< PropertyValueMap > & props = rProps.getProperties();
+
+    for ( const auto& rProp : *props )
+    {
+        if ( isCachable( rProp.first, rProp.second.isCaseSensitive() ) )
+            m_aProps.addProperty( rProp.first,
+                                  rProp.second.value(),
+                                  rProp.second.isCaseSensitive() );
+    }
+}
+
+
+void CachableContentProperties::addProperties(
+    const std::vector< DAVPropertyValue > & rProps )
+{
+    for ( const auto& rProp : rProps )
+    {
+        if ( isCachable( rProp.Name, rProp.IsCaseSensitive ) )
+            m_aProps.addProperty( rProp );
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/ContentProperties.hxx b/ucb/source/ucp/webdav-curl/ContentProperties.hxx
new file mode 100644
index 000000000..0256450c2
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/ContentProperties.hxx
@@ -0,0 +1,173 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#pragma once
+
+#include <memory>
+#include <unordered_map>
+#include <vector>
+#include <rtl/ustring.hxx>
+#include <com/sun/star/uno/Any.hxx>
+#include <com/sun/star/uno/Sequence.hxx>
+#include "DAVResource.hxx"
+
+namespace com::sun::star::beans {
+    struct Property;
+}
+
+namespace http_dav_ucp
+{
+
+struct DAVResource;
+
+// PropertyValueMap.
+class PropertyValue
+{
+private:
+    css::uno::Any   m_aValue;
+    bool            m_bIsCaseSensitive;
+
+public:
+    PropertyValue()
+    : m_bIsCaseSensitive( true ) {}
+
+    explicit PropertyValue( const css::uno::Any & rValue,
+                   bool bIsCaseSensitive )
+    : m_aValue( rValue),
+      m_bIsCaseSensitive( bIsCaseSensitive ) {}
+
+    bool isCaseSensitive() const { return m_bIsCaseSensitive; }
+    const css::uno::Any & value() const { return m_aValue; }
+
+};
+
+typedef std::unordered_map< OUString, PropertyValue > PropertyValueMap;
+
+class ContentProperties
+{
+public:
+    ContentProperties();
+
+    explicit ContentProperties( const DAVResource& rResource );
+
+    // Mini props for transient contents.
+    ContentProperties( const OUString & rTitle, bool bFolder );
+
+    // Micro props for non-existing contents.
+    explicit ContentProperties( const OUString & rTitle );
+
+    ContentProperties( const ContentProperties & rOther );
+
+    bool contains( const OUString & rName ) const;
+
+    const css::uno::Any& getValue( const OUString & rName ) const;
+
+    // Maps the UCB property names contained in rProps with their DAV property
+    // counterparts, if possible. All unmappable properties will be included
+    // unchanged in resulting vector.
+    // The vector filled by this method can directly be handed over to
+    // DAVResourceAccess::PROPFIND. The result from PROPFIND
+    // (vector< DAVResource >) can be used to create a ContentProperties
+    // instance which can map DAV properties back to UCB properties.
+    static void UCBNamesToDAVNames( const css::uno::Sequence< css::beans::Property > & rProps,
+                                    std::vector< OUString > & resources );
+
+    // Maps the UCB property names contained in rProps with their HTTP header
+    // counterparts, if possible. All unmappable properties will be included
+    // unchanged in resulting vector.
+    // The vector filled by this method can directly be handed over to
+    // DAVResourceAccess::HEAD. The result from HEAD (vector< DAVResource >)
+    // can be used to create a ContentProperties instance which can map header
+    // names back to UCB properties.
+    static void UCBNamesToHTTPNames( const css::uno::Sequence< css::beans::Property > & rProps,
+                                    std::vector< OUString > & resources );
+
+    // return true, if all properties contained in rProps are contained in
+    // this ContentProperties instance. Otherwise, false will be returned.
+    // rNamesNotContained contain the missing names.
+    bool containsAllNames(
+                    const css::uno::Sequence< css::beans::Property >& rProps,
+                    std::vector< OUString > & rNamesNotContained ) const;
+
+    // adds all properties described by rProps that are actually contained in
+    // rContentProps to this instance. In case of duplicates the value
+    // already contained in this will left unchanged.
+    void addProperties( const std::vector< OUString > & rProps,
+                        const ContentProperties & rContentProps );
+
+    // overwrites probably existing entry.
+    void addProperty( const OUString & rName,
+                     const css::uno::Any & rValue,
+                     bool bIsCaseSensitive );
+
+    // overwrites probably existing entry.
+    void addProperty( const DAVPropertyValue & rProp );
+
+    bool isTrailingSlash() const { return m_bTrailingSlash; }
+
+    const OUString & getEscapedTitle() const { return m_aEscapedTitle; }
+
+    // Not good to expose implementation details, but this is actually an
+    // internal class.
+    const std::unique_ptr< PropertyValueMap > & getProperties() const
+    { return m_xProps; }
+
+private:
+    OUString m_aEscapedTitle;
+    std::unique_ptr< PropertyValueMap > m_xProps;
+    bool m_bTrailingSlash;
+
+    static css::uno::Any m_aEmptyAny;
+
+    ContentProperties & operator=( const ContentProperties & ); // n.i.
+
+    const PropertyValue * get( const OUString & rName ) const;
+};
+
+class CachableContentProperties
+{
+private:
+    ContentProperties m_aProps;
+
+    CachableContentProperties & operator=( const CachableContentProperties & ); // n.i.
+    CachableContentProperties( const CachableContentProperties & ); // n.i.
+
+public:
+    explicit CachableContentProperties( const ContentProperties & rProps );
+
+    void addProperties( const ContentProperties & rProps );
+
+    void addProperties( const std::vector< DAVPropertyValue > & rProps );
+
+    bool containsAllNames(
+                    const css::uno::Sequence< css::beans::Property >& rProps,
+                    std::vector< OUString > & rNamesNotContained ) const
+    { return m_aProps.containsAllNames( rProps, rNamesNotContained ); }
+
+    const css::uno::Any &
+    getValue( const OUString & rName ) const
+    { return m_aProps.getValue( rName ); }
+
+    operator const ContentProperties & () const { return m_aProps; }
+};
+
+} // namespace http_dav_ucp
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/CurlSession.cxx b/ucb/source/ucp/webdav-curl/CurlSession.cxx
new file mode 100644
index 000000000..f05797b76
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/CurlSession.cxx
@@ -0,0 +1,2442 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include "CurlSession.hxx"
+
+#include "SerfLockStore.hxx"
+#include "DAVProperties.hxx"
+#include "UCBDeadPropertyValue.hxx"
+#include "webdavresponseparser.hxx"
+
+#include <comphelper/attributelist.hxx>
+#include <comphelper/scopeguard.hxx>
+#include <comphelper/string.hxx>
+
+#include <o3tl/safeint.hxx>
+#include <o3tl/string_view.hxx>
+
+#include <officecfg/Inet.hxx>
+
+#include <com/sun/star/beans/NamedValue.hpp>
+#include <com/sun/star/io/Pipe.hpp>
+#include <com/sun/star/io/SequenceInputStream.hpp>
+#include <com/sun/star/io/SequenceOutputStream.hpp>
+#include <com/sun/star/xml/sax/Writer.hpp>
+
+#include <osl/time.h>
+#include <sal/log.hxx>
+#include <rtl/uri.hxx>
+#include <rtl/strbuf.hxx>
+#include <rtl/ustrbuf.hxx>
+#include <config_version.h>
+
+#include <map>
+#include <optional>
+#include <tuple>
+
+using namespace ::com::sun::star;
+
+namespace
+{
+/// globals container
+struct Init
+{
+    /// note: LockStore has its own mutex and calls CurlSession from its thread
+    ///       so don't call LockStore with m_Mutex held to prevent deadlock.
+    ::http_dav_ucp::SerfLockStore LockStore;
+
+    Init()
+    {
+        if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
+        {
+            assert(!"curl_global_init failed");
+        }
+    }
+    // do not call curl_global_cleanup() - this is not the only client of curl
+};
+Init g_Init;
+
+struct ResponseHeaders
+{
+    ::std::vector<::std::pair<::std::vector<OString>, ::std::optional<long>>> HeaderFields;
+    CURL* pCurl;
+    ResponseHeaders(CURL* const i_pCurl)
+        : pCurl(i_pCurl)
+    {
+    }
+};
+
+auto GetResponseCode(ResponseHeaders const& rHeaders) -> ::std::optional<long>
+{
+    return (rHeaders.HeaderFields.empty()) ? ::std::optional<long>{}
+                                           : rHeaders.HeaderFields.back().second;
+}
+
+struct DownloadTarget
+{
+    uno::Reference<io::XOutputStream> xOutStream;
+    ResponseHeaders const& rHeaders;
+    DownloadTarget(uno::Reference<io::XOutputStream> const& i_xOutStream,
+                   ResponseHeaders const& i_rHeaders)
+        : xOutStream(i_xOutStream)
+        , rHeaders(i_rHeaders)
+    {
+    }
+};
+
+struct UploadSource
+{
+    uno::Sequence<sal_Int8> const& rInData;
+    size_t nPosition;
+    UploadSource(uno::Sequence<sal_Int8> const& i_rInData)
+        : rInData(i_rInData)
+        , nPosition(0)
+    {
+    }
+};
+
+auto GetErrorString(CURLcode const rc, char const* const pErrorBuffer = nullptr) -> OString
+{
+    char const* const pMessage( // static fallback
+        (pErrorBuffer && pErrorBuffer[0] != '\0') ? pErrorBuffer : curl_easy_strerror(rc));
+    return OString::Concat("(") + OString::number(sal_Int32(rc)) + ") " + pMessage;
+}
+
+auto GetErrorStringMulti(CURLMcode const mc) -> OString
+{
+    return OString::Concat("(") + OString::number(sal_Int32(mc)) + ") " + curl_multi_strerror(mc);
+}
+
+/// represent an option to be passed to curl_easy_setopt()
+struct CurlOption
+{
+    CURLoption const Option;
+    enum class Type
+    {
+        Pointer,
+        Long,
+        CurlOffT
+    };
+    Type const Tag;
+    union {
+        void const* const pValue;
+        long /*const*/ lValue;
+        curl_off_t /*const*/ cValue;
+    };
+    char const* const pExceptionString;
+
+    CurlOption(CURLoption const i_Option, void const* const i_Value,
+               char const* const i_pExceptionString)
+        : Option(i_Option)
+        , Tag(Type::Pointer)
+        , pValue(i_Value)
+        , pExceptionString(i_pExceptionString)
+    {
+    }
+    // Depending on platform, curl_off_t may be "long" or a larger type
+    // so cannot use overloading to distinguish these cases.
+    CurlOption(CURLoption const i_Option, curl_off_t const i_Value,
+               char const* const i_pExceptionString, Type const type = Type::Long)
+        : Option(i_Option)
+        , Tag(type)
+        , pExceptionString(i_pExceptionString)
+    {
+        static_assert(sizeof(long) <= sizeof(curl_off_t));
+        switch (type)
+        {
+            case Type::Long:
+                lValue = i_Value;
+                break;
+            case Type::CurlOffT:
+                cValue = i_Value;
+                break;
+            default:
+                assert(false);
+        }
+    }
+};
+
+// NOBODY will prevent logging the response body in ProcessRequest() exception
+// handler, so only use it if logging is disabled
+const CurlOption g_NoBody{ CURLOPT_NOBODY,
+                           sal_detail_log_report(SAL_DETAIL_LOG_LEVEL_INFO, "ucb.ucp.webdav.curl")
+                                   == SAL_DETAIL_LOG_ACTION_IGNORE
+                               ? 1L
+                               : 0L,
+                           nullptr };
+
+/// combined guard class to ensure things are released in correct order,
+/// particularly in ProcessRequest() error handling
+class Guard
+{
+private:
+    /// mutex *first* because m_oGuard requires it
+    ::std::unique_lock<::std::mutex> m_Lock;
+    ::std::vector<CurlOption> const m_Options;
+    ::http_dav_ucp::CurlUri const& m_rURI;
+    CURL* const m_pCurl;
+
+public:
+    explicit Guard(::std::mutex& rMutex, ::std::vector<CurlOption> const& rOptions,
+                   ::http_dav_ucp::CurlUri const& rURI, CURL* const pCurl)
+        : m_Lock(rMutex, ::std::defer_lock)
+        , m_Options(rOptions)
+        , m_rURI(rURI)
+        , m_pCurl(pCurl)
+    {
+        Acquire();
+    }
+    ~Guard()
+    {
+        if (m_Lock.owns_lock())
+        {
+            Release();
+        }
+    }
+
+    void Acquire()
+    {
+        assert(!m_Lock.owns_lock());
+        m_Lock.lock();
+        for (auto const& it : m_Options)
+        {
+            CURLcode rc(CURL_LAST); // warning C4701
+            if (it.Tag == CurlOption::Type::Pointer)
+            {
+                rc = curl_easy_setopt(m_pCurl, it.Option, it.pValue);
+            }
+            else if (it.Tag == CurlOption::Type::Long)
+            {
+                rc = curl_easy_setopt(m_pCurl, it.Option, it.lValue);
+            }
+            else if (it.Tag == CurlOption::Type::CurlOffT)
+            {
+                rc = curl_easy_setopt(m_pCurl, it.Option, it.cValue);
+            }
+            else
+            {
+                assert(false);
+            }
+            if (it.pExceptionString != nullptr)
+            {
+                if (rc != CURLE_OK)
+                {
+                    SAL_WARN("ucb.ucp.webdav.curl",
+                             "set " << it.pExceptionString << " failed: " << GetErrorString(rc));
+                    throw ::http_dav_ucp::DAVException(
+                        ::http_dav_ucp::DAVException::DAV_SESSION_CREATE,
+                        ::http_dav_ucp::ConnectionEndPointString(m_rURI.GetHost(),
+                                                                 m_rURI.GetPort()));
+                }
+            }
+            else // many of the options cannot fail
+            {
+                assert(rc == CURLE_OK);
+            }
+        }
+    }
+    void Release()
+    {
+        assert(m_Lock.owns_lock());
+        for (auto const& it : m_Options)
+        {
+            CURLcode rc(CURL_LAST); // warning C4701
+            if (it.Tag == CurlOption::Type::Pointer)
+            {
+                rc = curl_easy_setopt(m_pCurl, it.Option, nullptr);
+            }
+            else if (it.Tag == CurlOption::Type::Long)
+            {
+                rc = curl_easy_setopt(m_pCurl, it.Option, 0L);
+            }
+            else if (it.Tag == CurlOption::Type::CurlOffT)
+            {
+                rc = curl_easy_setopt(m_pCurl, it.Option, curl_off_t(-1));
+            }
+            else
+            {
+                assert(false);
+            }
+            assert(rc == CURLE_OK);
+            (void)rc;
+        }
+        m_Lock.unlock();
+    }
+};
+
+} // namespace
+
+namespace http_dav_ucp
+{
+// libcurl callbacks:
+
+static int debug_callback(CURL* handle, curl_infotype type, char* data, size_t size,
+                          void* /*userdata*/)
+{
+    char const* pType(nullptr);
+    switch (type)
+    {
+        case CURLINFO_TEXT:
+            SAL_INFO("ucb.ucp.webdav.curl", "debug log: " << handle << ": " << data);
+            return 0;
+        case CURLINFO_HEADER_IN:
+            SAL_INFO("ucb.ucp.webdav.curl",
+                     "CURLINFO_HEADER_IN: " << handle << ": " << OString(data, size));
+            return 0;
+        case CURLINFO_HEADER_OUT:
+        {
+            // unlike IN, this is all headers in one call
+            OString tmp(data, size);
+            sal_Int32 const start(tmp.indexOf("Authorization: "));
+            if (start != -1)
+            {
+                sal_Int32 const end(tmp.indexOf("\r\n", start));
+                assert(end != -1);
+                sal_Int32 const len(SAL_N_ELEMENTS("Authorization: ") - 1);
+                tmp = tmp.replaceAt(
+                    start + len, end - start - len,
+                    OStringConcatenation(OString::number(end - start - len) + " bytes redacted"));
+            }
+            SAL_INFO("ucb.ucp.webdav.curl", "CURLINFO_HEADER_OUT: " << handle << ": " << tmp);
+            return 0;
+        }
+        case CURLINFO_DATA_IN:
+            pType = "CURLINFO_DATA_IN";
+            break;
+        case CURLINFO_DATA_OUT:
+            pType = "CURLINFO_DATA_OUT";
+            break;
+        case CURLINFO_SSL_DATA_IN:
+            pType = "CURLINFO_SSL_DATA_IN";
+            break;
+        case CURLINFO_SSL_DATA_OUT:
+            pType = "CURLINFO_SSL_DATA_OUT";
+            break;
+        default:
+            SAL_WARN("ucb.ucp.webdav.curl", "unexpected debug log type");
+            return 0;
+    }
+    SAL_INFO("ucb.ucp.webdav.curl", "debug log: " << handle << ": " << pType << " " << size);
+    return 0;
+}
+
+static size_t write_callback(char* const ptr, size_t const size, size_t const nmemb,
+                             void* const userdata)
+{
+    auto* const pTarget(static_cast<DownloadTarget*>(userdata));
+    if (!pTarget) // looks like ~every request may have a response body
+    {
+        return nmemb;
+    }
+    assert(size == 1); // says the man page
+    (void)size;
+    assert(pTarget->xOutStream.is());
+    auto const oResponseCode(GetResponseCode(pTarget->rHeaders));
+    if (!oResponseCode)
+    {
+        return 0; // that is an error
+    }
+    // always write, for exception handler in ProcessRequest()
+    //    if (200 <= *oResponseCode && *oResponseCode < 300)
+    {
+        try
+        {
+            uno::Sequence<sal_Int8> const data(reinterpret_cast<sal_Int8*>(ptr), nmemb);
+            pTarget->xOutStream->writeBytes(data);
+        }
+        catch (...)
+        {
+            SAL_WARN("ucb.ucp.webdav.curl", "exception in write_callback");
+            return 0; // error
+        }
+    }
+    // else: ignore the body? CurlSession will check the status eventually
+    return nmemb;
+}
+
+static size_t read_callback(char* const buffer, size_t const size, size_t const nitems,
+                            void* const userdata)
+{
+    auto* const pSource(static_cast<UploadSource*>(userdata));
+    assert(pSource);
+    size_t const nBytes(size * nitems);
+    size_t nRet(0);
+    try
+    {
+        assert(pSource->nPosition <= o3tl::make_unsigned(pSource->rInData.getLength()));
+        nRet = ::std::min<size_t>(pSource->rInData.getLength() - pSource->nPosition, nBytes);
+        ::std::memcpy(buffer, pSource->rInData.getConstArray() + pSource->nPosition, nRet);
+        pSource->nPosition += nRet;
+    }
+    catch (...)
+    {
+        SAL_WARN("ucb.ucp.webdav.curl", "exception in read_callback");
+        return CURL_READFUNC_ABORT; // error
+    }
+    return nRet;
+}
+
+static size_t header_callback(char* const buffer, size_t const size, size_t const nitems,
+                              void* const userdata)
+{
+    auto* const pHeaders(static_cast<ResponseHeaders*>(userdata));
+    assert(pHeaders);
+#if 0
+    if (!pHeaders) // TODO maybe not needed in every request? not sure
+    {
+        return nitems;
+    }
+#endif
+    assert(size == 1); // says the man page
+    (void)size;
+    try
+    {
+        if (nitems <= 2)
+        {
+            // end of header, body follows...
+            if (pHeaders->HeaderFields.empty())
+            {
+                SAL_WARN("ucb.ucp.webdav.curl", "header_callback: empty header?");
+                return 0; // error
+            }
+            // unfortunately there's no separate callback when the body begins,
+            // so have to manually retrieve the status code here
+            long statusCode(SC_NONE);
+            auto rc = curl_easy_getinfo(pHeaders->pCurl, CURLINFO_RESPONSE_CODE, &statusCode);
+            assert(rc == CURLE_OK);
+            (void)rc;
+            // always put the current response code here - wasn't necessarily in this header
+            pHeaders->HeaderFields.back().second.emplace(statusCode);
+        }
+        else if (buffer[0] == ' ' || buffer[0] == '\t') // folded header field?
+        {
+            size_t i(0);
+            do
+            {
+                ++i;
+            } while (i == ' ' || i == '\t');
+            if (pHeaders->HeaderFields.empty() || pHeaders->HeaderFields.back().second
+                || pHeaders->HeaderFields.back().first.empty())
+            {
+                SAL_WARN("ucb.ucp.webdav.curl",
+                         "header_callback: folded header field without start");
+                return 0; // error
+            }
+            pHeaders->HeaderFields.back().first.back()
+                += OString::Concat(" ") + ::std::string_view(&buffer[i], nitems - i);
+        }
+        else
+        {
+            if (pHeaders->HeaderFields.empty() || pHeaders->HeaderFields.back().second)
+            {
+                pHeaders->HeaderFields.emplace_back();
+            }
+            pHeaders->HeaderFields.back().first.emplace_back(OString(buffer, nitems));
+        }
+    }
+    catch (...)
+    {
+        SAL_WARN("ucb.ucp.webdav.curl", "exception in header_callback");
+        return 0; // error
+    }
+    return nitems;
+}
+
+static auto ProcessHeaders(::std::vector<OString> const& rHeaders) -> ::std::map<OUString, OUString>
+{
+    ::std::map<OUString, OUString> ret;
+    for (OString const& rLine : rHeaders)
+    {
+        OString line;
+        if (!rLine.endsWith("\r\n", &line))
+        {
+            SAL_WARN("ucb.ucp.webdav.curl", "invalid header field (no CRLF)");
+            continue;
+        }
+        if (line.startsWith("HTTP/") // first line
+            || line.isEmpty()) // last line
+        {
+            continue;
+        }
+        auto const nColon(line.indexOf(':'));
+        if (nColon == -1)
+        {
+            {
+                SAL_WARN("ucb.ucp.webdav.curl", "invalid header field (no :)");
+            }
+            continue;
+        }
+        if (nColon == 0)
+        {
+            SAL_WARN("ucb.ucp.webdav.curl", "invalid header field (empty name)");
+            continue;
+        }
+        // case insensitive; must be ASCII
+        auto const name(::rtl::OStringToOUString(line.copy(0, nColon).toAsciiLowerCase(),
+                                                 RTL_TEXTENCODING_ASCII_US));
+        sal_Int32 nStart(nColon + 1);
+        while (nStart < line.getLength() && (line[nStart] == ' ' || line[nStart] == '\t'))
+        {
+            ++nStart;
+        }
+        sal_Int32 nEnd(line.getLength());
+        while (nStart < nEnd && (line[nEnd - 1] == ' ' || line[nEnd - 1] == '\t'))
+        {
+            --nEnd;
+        }
+        // RFC 7230 says that only ASCII works reliably anyway (neon also did this)
+        auto const value(::rtl::OStringToOUString(line.subView(nStart, nEnd - nStart),
+                                                  RTL_TEXTENCODING_ASCII_US));
+        auto const it(ret.find(name));
+        if (it != ret.end())
+        {
+            it->second = it->second + "," + value;
+        }
+        else
+        {
+            ret[name] = value;
+        }
+    }
+    return ret;
+}
+
+static auto ExtractRequestedHeaders(
+    ResponseHeaders const& rHeaders,
+    ::std::pair<::std::vector<OUString> const&, DAVResource&> const* const pRequestedHeaders)
+    -> void
+{
+    ::std::map<OUString, OUString> const headerMap(
+        ProcessHeaders(rHeaders.HeaderFields.back().first));
+    if (pRequestedHeaders)
+    {
+        for (OUString const& rHeader : pRequestedHeaders->first)
+        {
+            auto const it(headerMap.find(rHeader.toAsciiLowerCase()));
+            if (it != headerMap.end())
+            {
+                DAVPropertyValue value;
+                value.IsCaseSensitive = false;
+                value.Name = it->first;
+                value.Value <<= it->second;
+                pRequestedHeaders->second.properties.push_back(value);
+            }
+        }
+    }
+}
+
+// this appears to be the only way to get the "realm" from libcurl
+static auto ExtractRealm(ResponseHeaders const& rHeaders, char const* const pAuthHeaderName)
+    -> ::std::optional<OUString>
+{
+    ::std::map<OUString, OUString> const headerMap(
+        ProcessHeaders(rHeaders.HeaderFields.back().first));
+    auto const it(headerMap.find(OUString::createFromAscii(pAuthHeaderName).toAsciiLowerCase()));
+    if (it == headerMap.end())
+    {
+        SAL_WARN("ucb.ucp.webdav.curl", "cannot find auth header");
+        return {};
+    }
+    // It may be possible that the header contains multiple methods each with
+    // a different realm - extract only the first one bc the downstream API
+    // only supports one anyway.
+    // case insensitive!
+    auto i(it->second.toAsciiLowerCase().indexOf("realm="));
+    // is optional
+    if (i == -1)
+    {
+        SAL_INFO("ucb.ucp.webdav.curl", "auth header has no realm");
+        return {};
+    }
+    // no whitespace allowed before or after =
+    i += ::std::strlen("realm=");
+    if (it->second.getLength() < i + 2 || it->second[i] != '\"')
+    {
+        SAL_WARN("ucb.ucp.webdav.curl", "no realm value");
+        return {};
+    }
+    ++i;
+    OUStringBuffer buf;
+    while (i < it->second.getLength() && it->second[i] != '\"')
+    {
+        if (it->second[i] == '\\') // quoted-pair escape
+        {
+            ++i;
+            if (it->second.getLength() <= i)
+            {
+                SAL_WARN("ucb.ucp.webdav.curl", "unterminated quoted-pair");
+                return {};
+            }
+        }
+        buf.append(it->second[i]);
+        ++i;
+    }
+    if (it->second.getLength() <= i)
+    {
+        SAL_WARN("ucb.ucp.webdav.curl", "unterminated realm");
+        return {};
+    }
+    return buf.makeStringAndClear();
+}
+
+CurlSession::CurlSession(uno::Reference<uno::XComponentContext> const& xContext,
+                         ::rtl::Reference<DAVSessionFactory> const& rpFactory, OUString const& rURI,
+                         uno::Sequence<beans::NamedValue> const& rFlags,
+                         ::ucbhelper::InternetProxyDecider const& rProxyDecider)
+    : DAVSession(rpFactory)
+    , m_xContext(xContext)
+    , m_Flags(rFlags)
+    , m_URI(rURI)
+    , m_Proxy(rProxyDecider.getProxy(m_URI.GetScheme(), m_URI.GetHost(), m_URI.GetPort()))
+{
+    assert(m_URI.GetScheme() == "http" || m_URI.GetScheme() == "https");
+    m_pCurlMulti.reset(curl_multi_init());
+    if (!m_pCurlMulti)
+    {
+        SAL_WARN("ucb.ucp.webdav.curl", "curl_multi_init failed");
+        throw DAVException(DAVException::DAV_SESSION_CREATE,
+                           ConnectionEndPointString(m_URI.GetHost(), m_URI.GetPort()));
+    }
+    m_pCurl.reset(curl_easy_init());
+    if (!m_pCurl)
+    {
+        SAL_WARN("ucb.ucp.webdav.curl", "curl_easy_init failed");
+        throw DAVException(DAVException::DAV_SESSION_CREATE,
+                           ConnectionEndPointString(m_URI.GetHost(), m_URI.GetPort()));
+    }
+    curl_version_info_data const* const pVersion(curl_version_info(CURLVERSION_NOW));
+    assert(pVersion);
+    SAL_INFO("ucb.ucp.webdav.curl",
+             "curl version: " << pVersion->version << " " << pVersion->host
+                              << " features: " << ::std::hex << pVersion->features << " ssl: "
+                              << pVersion->ssl_version << " libz: " << pVersion->libz_version);
+    // Make sure a User-Agent header is always included, as at least
+    // en.wikipedia.org:80 forces back 403 "Scripts should use an informative
+    // User-Agent string with contact information, or they may be IP-blocked
+    // without notice" otherwise:
+    OString const useragent(
+        OString::Concat("LibreOffice " LIBO_VERSION_DOTTED " denylistedbackend/")
+        + ::std::string_view(pVersion->version, strlen(pVersion->version)) + " "
+        + pVersion->ssl_version);
+    // looks like an explicit "User-Agent" header in CURLOPT_HTTPHEADER
+    // will override CURLOPT_USERAGENT, see Curl_http_useragent(), so no need
+    // to check anything here
+    auto rc = curl_easy_setopt(m_pCurl.get(), CURLOPT_USERAGENT, useragent.getStr());
+    if (rc != CURLE_OK)
+    {
+        SAL_WARN("ucb.ucp.webdav.curl", "CURLOPT_USERAGENT failed: " << GetErrorString(rc));
+        throw DAVException(DAVException::DAV_SESSION_CREATE,
+                           ConnectionEndPointString(m_URI.GetHost(), m_URI.GetPort()));
+    }
+    m_ErrorBuffer[0] = '\0';
+    // this supposedly gives the highest quality error reporting
+    rc = curl_easy_setopt(m_pCurl.get(), CURLOPT_ERRORBUFFER, m_ErrorBuffer);
+    assert(rc == CURLE_OK);
+#if 1
+    // just for debugging...
+    rc = curl_easy_setopt(m_pCurl.get(), CURLOPT_DEBUGFUNCTION, debug_callback);
+    assert(rc == CURLE_OK);
+#endif
+    rc = curl_easy_setopt(m_pCurl.get(), CURLOPT_VERBOSE, 1L);
+    assert(rc == CURLE_OK);
+    // accept any encoding supported by libcurl
+    rc = curl_easy_setopt(m_pCurl.get(), CURLOPT_ACCEPT_ENCODING, "");
+    if (rc != CURLE_OK)
+    {
+        SAL_WARN("ucb.ucp.webdav.curl", "CURLOPT_ACCEPT_ENCODING failed: " << GetErrorString(rc));
+        throw DAVException(DAVException::DAV_SESSION_CREATE,
+                           ConnectionEndPointString(m_URI.GetHost(), m_URI.GetPort()));
+    }
+    auto const connectTimeout(officecfg::Inet::Settings::ConnectTimeout::get());
+    // default is 300s
+    rc = curl_easy_setopt(m_pCurl.get(), CURLOPT_CONNECTTIMEOUT,
+                          ::std::max<long>(2L, ::std::min<long>(connectTimeout, 180L)));
+    if (rc != CURLE_OK)
+    {
+        SAL_WARN("ucb.ucp.webdav.curl", "CURLOPT_CONNECTTIMEOUT failed: " << GetErrorString(rc));
+        throw DAVException(DAVException::DAV_SESSION_CREATE,
+                           ConnectionEndPointString(m_URI.GetHost(), m_URI.GetPort()));
+    }
+    auto const readTimeout(officecfg::Inet::Settings::ReadTimeout::get());
+    m_nReadTimeout = ::std::max<int>(20, ::std::min<long>(readTimeout, 180)) * 1000;
+    // default is infinite
+    rc = curl_easy_setopt(m_pCurl.get(), CURLOPT_TIMEOUT, 300L);
+    if (rc != CURLE_OK)
+    {
+        SAL_WARN("ucb.ucp.webdav.curl", "CURLOPT_TIMEOUT failed: " << GetErrorString(rc));
+        throw DAVException(DAVException::DAV_SESSION_CREATE,
+                           ConnectionEndPointString(m_URI.GetHost(), m_URI.GetPort()));
+    }
+    rc = curl_easy_setopt(m_pCurl.get(), CURLOPT_WRITEFUNCTION, &write_callback);
+    assert(rc == CURLE_OK);
+    rc = curl_easy_setopt(m_pCurl.get(), CURLOPT_READFUNCTION, &read_callback);
+    assert(rc == CURLE_OK);
+    rc = curl_easy_setopt(m_pCurl.get(), CURLOPT_HEADERFUNCTION, &header_callback);
+    assert(rc == CURLE_OK);
+    // tdf#149921 by default, with schannel (WNT) connection fails if revocation
+    // lists cannot be checked; try to limit the checking to when revocation
+    // lists can actually be retrieved (usually not the case for self-signed CA)
+#if CURL_AT_LEAST_VERSION(7, 70, 0)
+    rc = curl_easy_setopt(m_pCurl.get(), CURLOPT_SSL_OPTIONS, CURLSSLOPT_REVOKE_BEST_EFFORT);
+    assert(rc == CURLE_OK);
+    rc = curl_easy_setopt(m_pCurl.get(), CURLOPT_PROXY_SSL_OPTIONS, CURLSSLOPT_REVOKE_BEST_EFFORT);
+    assert(rc == CURLE_OK);
+#endif
+    // set this initially, may be overwritten during authentication
+    rc = curl_easy_setopt(m_pCurl.get(), CURLOPT_HTTPAUTH, CURLAUTH_ANY);
+    assert(rc == CURLE_OK); // ANY is always available
+    // always set CURLOPT_PROXY to suppress proxy detection in libcurl
+    OString const utf8Proxy(OUStringToOString(m_Proxy.aName, RTL_TEXTENCODING_UTF8));
+    rc = curl_easy_setopt(m_pCurl.get(), CURLOPT_PROXY, utf8Proxy.getStr());
+    if (rc != CURLE_OK)
+    {
+        SAL_WARN("ucb.ucp.webdav.curl", "CURLOPT_PROXY failed: " << GetErrorString(rc));
+        throw DAVException(DAVException::DAV_SESSION_CREATE,
+                           ConnectionEndPointString(m_Proxy.aName, m_Proxy.nPort));
+    }
+    if (!m_Proxy.aName.isEmpty())
+    {
+        rc = curl_easy_setopt(m_pCurl.get(), CURLOPT_PROXYPORT, static_cast<long>(m_Proxy.nPort));
+        assert(rc == CURLE_OK);
+        // set this initially, may be overwritten during authentication
+        rc = curl_easy_setopt(m_pCurl.get(), CURLOPT_PROXYAUTH, CURLAUTH_ANY);
+        assert(rc == CURLE_OK); // ANY is always available
+    }
+    auto const it(::std::find_if(m_Flags.begin(), m_Flags.end(),
+                                 [](auto const& rFlag) { return rFlag.Name == "KeepAlive"; }));
+    if (it != m_Flags.end() && it->Value.get<bool>())
+    {
+        // neon would close the connection from ne_end_request(), this seems
+        // to be the equivalent and not CURLOPT_TCP_KEEPALIVE
+        rc = curl_easy_setopt(m_pCurl.get(), CURLOPT_FORBID_REUSE, 1L);
+        assert(rc == CURLE_OK);
+    }
+}
+
+CurlSession::~CurlSession() {}
+
+auto CurlSession::CanUse(OUString const& rURI, uno::Sequence<beans::NamedValue> const& rFlags)
+    -> bool
+{
+    try
+    {
+        CurlUri const uri(rURI);
+
+        return m_URI.GetScheme() == uri.GetScheme() && m_URI.GetHost() == uri.GetHost()
+               && m_URI.GetPort() == uri.GetPort() && m_Flags == rFlags;
+    }
+    catch (DAVException const&)
+    {
+        return false;
+    }
+}
+
+auto CurlSession::UsesProxy() -> bool
+{
+    assert(m_URI.GetScheme() == "http" || m_URI.GetScheme() == "https");
+    return !m_Proxy.aName.isEmpty();
+}
+
+auto CurlSession::abort() -> void
+{
+    // note: abort() was a no-op since OOo 3.2 and before that it crashed.
+    bool expected(false);
+    // it would be pointless to lock m_Mutex here as the other thread holds it
+    if (m_AbortFlag.compare_exchange_strong(expected, true))
+    {
+        // This function looks safe to call without m_Mutex as long as the
+        // m_pCurlMulti handle is not destroyed, and the caller must own a ref
+        // to this object which keeps it alive; it should cause poll to return.
+        curl_multi_wakeup(m_pCurlMulti.get());
+    }
+}
+
+/// this is just a bunch of static member functions called from CurlSession
+struct CurlProcessor
+{
+    static auto URIReferenceToURI(CurlSession& rSession, OUString const& rURIReference) -> CurlUri;
+
+    static auto ProcessRequestImpl(
+        CurlSession& rSession, CurlUri const& rURI, OUString const& rMethod,
+        curl_slist* pRequestHeaderList, uno::Reference<io::XOutputStream> const* pxOutStream,
+        uno::Sequence<sal_Int8> const* pInData,
+        ::std::pair<::std::vector<OUString> const&, DAVResource&> const* pRequestedHeaders,
+        ResponseHeaders& rHeaders) -> void;
+
+    static auto ProcessRequest(
+        CurlSession& rSession, CurlUri const& rURI, OUString const& rMethod,
+        ::std::vector<CurlOption> const& rOptions, DAVRequestEnvironment const* pEnv,
+        ::std::unique_ptr<curl_slist, deleter_from_fn<curl_slist, curl_slist_free_all>>
+            pRequestHeaderList,
+        uno::Reference<io::XOutputStream> const* pxOutStream,
+        uno::Reference<io::XInputStream> const* pxInStream,
+        ::std::pair<::std::vector<OUString> const&, DAVResource&> const* pRequestedHeaders) -> void;
+
+    static auto
+    PropFind(CurlSession& rSession, CurlUri const& rURI, Depth depth,
+             ::std::tuple<::std::vector<OUString> const&, ::std::vector<DAVResource>* const,
+                          ::std::vector<ucb::Lock>* const> const* o_pRequestedProperties,
+             ::std::vector<DAVResourceInfo>* const o_pResourceInfos,
+             DAVRequestEnvironment const& rEnv) -> void;
+
+    static auto MoveOrCopy(CurlSession& rSession, OUString const& rSourceURIReference,
+                           ::std::u16string_view rDestinationURI, DAVRequestEnvironment const& rEnv,
+                           bool isOverwrite, char const* pMethod) -> void;
+
+    static auto Lock(CurlSession& rSession, CurlUri const& rURI, DAVRequestEnvironment const* pEnv,
+                     ::std::unique_ptr<curl_slist, deleter_from_fn<curl_slist, curl_slist_free_all>>
+                         pRequestHeaderList,
+                     uno::Reference<io::XInputStream> const* pxInStream)
+        -> ::std::vector<::std::pair<ucb::Lock, sal_Int32>>;
+
+    static auto Unlock(CurlSession& rSession, CurlUri const& rURI,
+                       DAVRequestEnvironment const* pEnv) -> void;
+};
+
+auto CurlProcessor::URIReferenceToURI(CurlSession& rSession, OUString const& rURIReference)
+    -> CurlUri
+{
+    // No need to acquire rSession.m_Mutex because accessed members are const.
+    if (rSession.UsesProxy())
+    // very odd, but see DAVResourceAccess::getRequestURI() :-/
+    {
+        assert(rURIReference.startsWith("http://") || rURIReference.startsWith("https://"));
+        return CurlUri(rURIReference);
+    }
+    else
+    {
+        assert(rURIReference.startsWith("/"));
+        return rSession.m_URI.CloneWithRelativeRefPathAbsolute(rURIReference);
+    }
+}
+
+/// main function to initiate libcurl requests
+auto CurlProcessor::ProcessRequestImpl(
+    CurlSession& rSession, CurlUri const& rURI, OUString const& rMethod,
+    curl_slist* const pRequestHeaderList,
+    uno::Reference<io::XOutputStream> const* const pxOutStream,
+    uno::Sequence<sal_Int8> const* const pInData,
+    ::std::pair<::std::vector<OUString> const&, DAVResource&> const* const pRequestedHeaders,
+    ResponseHeaders& rHeaders) -> void
+{
+    ::comphelper::ScopeGuard const g([&]() {
+        auto rc = curl_easy_setopt(rSession.m_pCurl.get(), CURLOPT_HEADERDATA, nullptr);
+        assert(rc == CURLE_OK);
+        (void)rc;
+        if (pxOutStream)
+        {
+            rc = curl_easy_setopt(rSession.m_pCurl.get(), CURLOPT_WRITEDATA, nullptr);
+            assert(rc == CURLE_OK);
+        }
+        if (pInData)
+        {
+            rc = curl_easy_setopt(rSession.m_pCurl.get(), CURLOPT_READDATA, nullptr);
+            assert(rc == CURLE_OK);
+            rc = curl_easy_setopt(rSession.m_pCurl.get(), CURLOPT_UPLOAD, 0L);
+            assert(rc == CURLE_OK);
+        }
+        if (pRequestHeaderList)
+        {
+            rc = curl_easy_setopt(rSession.m_pCurl.get(), CURLOPT_HTTPHEADER, nullptr);
+            assert(rc == CURLE_OK);
+        }
+    });
+
+    if (pRequestHeaderList)
+    {
+        auto rc = curl_easy_setopt(rSession.m_pCurl.get(), CURLOPT_HTTPHEADER, pRequestHeaderList);
+        assert(rc == CURLE_OK);
+        (void)rc;
+    }
+
+    auto rc = curl_easy_setopt(rSession.m_pCurl.get(), CURLOPT_CURLU, rURI.GetCURLU());
+    assert(rc == CURLE_OK); // can't fail since 7.63.0
+
+    rc = curl_easy_setopt(rSession.m_pCurl.get(), CURLOPT_HEADERDATA, &rHeaders);
+    assert(rc == CURLE_OK);
+    ::std::optional<DownloadTarget> oDownloadTarget;
+    if (pxOutStream)
+    {
+        oDownloadTarget.emplace(*pxOutStream, rHeaders);
+        rc = curl_easy_setopt(rSession.m_pCurl.get(), CURLOPT_WRITEDATA, &*oDownloadTarget);
+        assert(rc == CURLE_OK);
+    }
+    ::std::optional<UploadSource> oUploadSource;
+    if (pInData)
+    {
+        oUploadSource.emplace(*pInData);
+        rc = curl_easy_setopt(rSession.m_pCurl.get(), CURLOPT_READDATA, &*oUploadSource);
+        assert(rc == CURLE_OK);
+    }
+    rSession.m_ErrorBuffer[0] = '\0';
+
+    // note: easy handle must be added for *every* transfer!
+    // otherwise it gets stuck in MSTATE_MSGSENT forever after 1st transfer
+    auto mc = curl_multi_add_handle(rSession.m_pCurlMulti.get(), rSession.m_pCurl.get());
+    if (mc != CURLM_OK)
+    {
+        SAL_WARN("ucb.ucp.webdav.curl",
+                 "curl_multi_add_handle failed: " << GetErrorStringMulti(mc));
+        throw DAVException(
+            DAVException::DAV_SESSION_CREATE,
+            ConnectionEndPointString(rSession.m_URI.GetHost(), rSession.m_URI.GetPort()));
+    }
+    ::comphelper::ScopeGuard const gg([&]() {
+        mc = curl_multi_remove_handle(rSession.m_pCurlMulti.get(), rSession.m_pCurl.get());
+        if (mc != CURLM_OK)
+        {
+            SAL_WARN("ucb.ucp.webdav.curl",
+                     "curl_multi_remove_handle failed: " << GetErrorStringMulti(mc));
+        }
+    });
+
+    // this is where libcurl actually does something
+    rc = CURL_LAST; // clear current value
+    int nRunning;
+    do
+    {
+        mc = curl_multi_perform(rSession.m_pCurlMulti.get(), &nRunning);
+        if (mc != CURLM_OK)
+        {
+            SAL_WARN("ucb.ucp.webdav.curl",
+                     "curl_multi_perform failed: " << GetErrorStringMulti(mc));
+            throw DAVException(
+                DAVException::DAV_HTTP_CONNECT,
+                ConnectionEndPointString(rSession.m_URI.GetHost(), rSession.m_URI.GetPort()));
+        }
+        if (nRunning == 0)
+        { // short request like HEAD on loopback could be done in first call
+            break;
+        }
+        int nFDs;
+        mc = curl_multi_poll(rSession.m_pCurlMulti.get(), nullptr, 0, rSession.m_nReadTimeout,
+                             &nFDs);
+        if (mc != CURLM_OK)
+        {
+            SAL_WARN("ucb.ucp.webdav.curl", "curl_multi_poll failed: " << GetErrorStringMulti(mc));
+            throw DAVException(
+                DAVException::DAV_HTTP_CONNECT,
+                ConnectionEndPointString(rSession.m_URI.GetHost(), rSession.m_URI.GetPort()));
+        }
+        if (rSession.m_AbortFlag.load())
+        { // flag was set by abort() -> not sure what exception to throw?
+            throw DAVException(DAVException::DAV_HTTP_ERROR, "abort() was called", 0);
+        }
+    } while (nRunning != 0);
+    // there should be exactly 1 CURLMsg now, but the interface is
+    // extensible so future libcurl versions could yield additional things
+    do
+    {
+        CURLMsg const* const pMsg = curl_multi_info_read(rSession.m_pCurlMulti.get(), &nRunning);
+        if (pMsg && pMsg->msg == CURLMSG_DONE)
+        {
+            assert(pMsg->easy_handle == rSession.m_pCurl.get());
+            rc = pMsg->data.result;
+        }
+        else
+        {
+            SAL_WARN("ucb.ucp.webdav.curl", "curl_multi_info_read unexpected result");
+        }
+    } while (nRunning != 0);
+
+    // error handling part 1: libcurl errors
+    if (rc != CURLE_OK)
+    {
+        // TODO: is there any value in extracting CURLINFO_OS_ERRNO
+        SAL_WARN("ucb.ucp.webdav.curl",
+                 "curl_easy_perform failed: " << GetErrorString(rc, rSession.m_ErrorBuffer));
+        switch (rc)
+        {
+            case CURLE_UNSUPPORTED_PROTOCOL:
+                throw DAVException(DAVException::DAV_UNSUPPORTED);
+            case CURLE_COULDNT_RESOLVE_PROXY:
+                throw DAVException(
+                    DAVException::DAV_HTTP_LOOKUP,
+                    ConnectionEndPointString(rSession.m_Proxy.aName, rSession.m_Proxy.nPort));
+            case CURLE_COULDNT_RESOLVE_HOST:
+                throw DAVException(
+                    DAVException::DAV_HTTP_LOOKUP,
+                    ConnectionEndPointString(rSession.m_URI.GetHost(), rSession.m_URI.GetPort()));
+            case CURLE_COULDNT_CONNECT:
+            case CURLE_SSL_CONNECT_ERROR:
+            case CURLE_SSL_CERTPROBLEM:
+            case CURLE_SSL_CIPHER:
+            case CURLE_PEER_FAILED_VERIFICATION:
+            case CURLE_SSL_ISSUER_ERROR:
+            case CURLE_SSL_PINNEDPUBKEYNOTMATCH:
+            case CURLE_SSL_INVALIDCERTSTATUS:
+            case CURLE_FAILED_INIT:
+#if CURL_AT_LEAST_VERSION(7, 69, 0)
+            case CURLE_QUIC_CONNECT_ERROR:
+#endif
+                throw DAVException(
+                    DAVException::DAV_HTTP_CONNECT,
+                    ConnectionEndPointString(rSession.m_URI.GetHost(), rSession.m_URI.GetPort()));
+            case CURLE_REMOTE_ACCESS_DENIED:
+            case CURLE_LOGIN_DENIED:
+            case CURLE_AUTH_ERROR:
+                throw DAVException(
+                    DAVException::DAV_HTTP_AUTH, // probably?
+                    ConnectionEndPointString(rSession.m_URI.GetHost(), rSession.m_URI.GetPort()));
+            case CURLE_WRITE_ERROR:
+            case CURLE_READ_ERROR: // error returned from our callbacks
+            case CURLE_OUT_OF_MEMORY:
+            case CURLE_ABORTED_BY_CALLBACK:
+            case CURLE_BAD_FUNCTION_ARGUMENT:
+            case CURLE_SEND_ERROR:
+            case CURLE_RECV_ERROR:
+            case CURLE_SSL_CACERT_BADFILE:
+            case CURLE_SSL_CRL_BADFILE:
+            case CURLE_RECURSIVE_API_CALL:
+                throw DAVException(
+                    DAVException::DAV_HTTP_FAILED,
+                    ConnectionEndPointString(rSession.m_URI.GetHost(), rSession.m_URI.GetPort()));
+            case CURLE_OPERATION_TIMEDOUT:
+                throw DAVException(
+                    DAVException::DAV_HTTP_TIMEOUT,
+                    ConnectionEndPointString(rSession.m_URI.GetHost(), rSession.m_URI.GetPort()));
+            default: // lots of generic errors
+                throw DAVException(DAVException::DAV_HTTP_ERROR, "", 0);
+        }
+    }
+    // error handling part 2: HTTP status codes
+    long statusCode(SC_NONE);
+    rc = curl_easy_getinfo(rSession.m_pCurl.get(), CURLINFO_RESPONSE_CODE, &statusCode);
+    assert(rc == CURLE_OK);
+    assert(statusCode != SC_NONE); // ??? should be error returned from perform?
+    SAL_INFO("ucb.ucp.webdav.curl", "HTTP status code: " << statusCode);
+    if (statusCode < 300)
+    {
+        // neon did this regardless of status or even error, which seems odd
+        ExtractRequestedHeaders(rHeaders, pRequestedHeaders);
+    }
+    else
+    {
+        // create message containing the HTTP method and response status line
+        OUString statusLine("\n" + rMethod + "\n=>\n");
+        if (!rHeaders.HeaderFields.empty() && !rHeaders.HeaderFields.back().first.empty()
+            && rHeaders.HeaderFields.back().first.front().startsWith("HTTP"))
+        {
+            statusLine += ::rtl::OStringToOUString(
+                ::o3tl::trim(rHeaders.HeaderFields.back().first.front()),
+                RTL_TEXTENCODING_ASCII_US);
+        }
+        switch (statusCode)
+        {
+            case SC_REQUEST_TIMEOUT:
+            {
+                throw DAVException(
+                    DAVException::DAV_HTTP_TIMEOUT,
+                    ConnectionEndPointString(rSession.m_URI.GetHost(), rSession.m_URI.GetPort()));
+                break;
+            }
+            case SC_MOVED_PERMANENTLY:
+            case SC_MOVED_TEMPORARILY:
+            case SC_SEE_OTHER:
+            case SC_TEMPORARY_REDIRECT:
+            {
+                // could also use CURLOPT_FOLLOWLOCATION but apparently the
+                // upper layer wants to know about redirects?
+                char* pRedirectURL(nullptr);
+                rc = curl_easy_getinfo(rSession.m_pCurl.get(), CURLINFO_REDIRECT_URL,
+                                       &pRedirectURL);
+                assert(rc == CURLE_OK);
+                if (pRedirectURL)
+                {
+                    // Sharepoint 2016 workaround: contains unencoded U+0020
+                    OUString const redirectURL(::rtl::Uri::encode(
+                        pRedirectURL
+                            ? OUString(pRedirectURL, strlen(pRedirectURL), RTL_TEXTENCODING_UTF8)
+                            : OUString(),
+                        rtl_UriCharClassUric, rtl_UriEncodeKeepEscapes, RTL_TEXTENCODING_UTF8));
+
+                    throw DAVException(DAVException::DAV_HTTP_REDIRECT, redirectURL);
+                }
+                [[fallthrough]];
+            }
+            default:
+                throw DAVException(DAVException::DAV_HTTP_ERROR, statusLine, statusCode);
+        }
+    }
+
+    if (pxOutStream)
+    {
+        (*pxOutStream)->closeOutput(); // signal EOF
+    }
+}
+
+static auto TryRemoveExpiredLockToken(CurlSession& rSession, CurlUri const& rURI,
+                                      DAVRequestEnvironment const* const pEnv) -> bool
+{
+    if (!pEnv)
+    {
+        // caller was a NonInteractive_*LOCK function anyway, its caller is LockStore
+        return false;
+    }
+    OUString const* const pToken(g_Init.LockStore.getLockTokenForURI(rURI.GetURI(), nullptr));
+    if (!pToken)
+    {
+        return false;
+    }
+    try
+    {
+        // determine validity of existing lock via lockdiscovery request
+        ::std::vector<OUString> const propertyNames{ DAVProperties::LOCKDISCOVERY };
+        ::std::vector<ucb::Lock> locks;
+        ::std::tuple<::std::vector<OUString> const&, ::std::vector<DAVResource>* const,
+                     ::std::vector<ucb::Lock>* const> const args(propertyNames, nullptr, &locks);
+
+        CurlProcessor::PropFind(rSession, rURI, DAVZERO, &args, nullptr, *pEnv);
+
+        // https://datatracker.ietf.org/doc/html/rfc4918#section-15.8
+        // The response MAY not contain tokens, but hopefully it
+        // will if client is properly authenticated.
+        if (::std::any_of(locks.begin(), locks.end(), [pToken](ucb::Lock const& rLock) {
+                return ::std::any_of(
+                    rLock.LockTokens.begin(), rLock.LockTokens.end(),
+                    [pToken](OUString const& rToken) { return *pToken == rToken; });
+            }))
+        {
+            return false; // still have the lock
+        }
+
+        SAL_INFO("ucb.ucp.webdav.curl",
+                 "lock token expired, removing: " << rURI.GetURI() << " " << *pToken);
+        g_Init.LockStore.removeLock(rURI.GetURI());
+        return true;
+    }
+    catch (DAVException const&)
+    {
+        return false; // ignore, the caller already has a better exception
+    }
+}
+
+auto CurlProcessor::ProcessRequest(
+    CurlSession& rSession, CurlUri const& rURI, OUString const& rMethod,
+    ::std::vector<CurlOption> const& rOptions, DAVRequestEnvironment const* const pEnv,
+    ::std::unique_ptr<curl_slist, deleter_from_fn<curl_slist, curl_slist_free_all>>
+        pRequestHeaderList,
+    uno::Reference<io::XOutputStream> const* const pxOutStream,
+    uno::Reference<io::XInputStream> const* const pxInStream,
+    ::std::pair<::std::vector<OUString> const&, DAVResource&> const* const pRequestedHeaders)
+    -> void
+{
+    if (pEnv)
+    { // add custom request headers passed by caller
+        for (auto const& rHeader : pEnv->m_aRequestHeaders)
+        {
+            OString const utf8Header(
+                OUStringToOString(rHeader.first, RTL_TEXTENCODING_ASCII_US) + ": "
+                + OUStringToOString(rHeader.second, RTL_TEXTENCODING_ASCII_US));
+            pRequestHeaderList.reset(
+                curl_slist_append(pRequestHeaderList.release(), utf8Header.getStr()));
+            if (!pRequestHeaderList)
+            {
+                throw uno::RuntimeException("curl_slist_append failed");
+            }
+        }
+    }
+
+    uno::Sequence<sal_Int8> data;
+    if (pxInStream)
+    {
+        uno::Reference<io::XSeekable> const xSeekable(*pxInStream, uno::UNO_QUERY);
+        if (xSeekable.is())
+        {
+            auto const len(xSeekable->getLength() - xSeekable->getPosition());
+            if ((**pxInStream).readBytes(data, len) != len)
+            {
+                throw uno::RuntimeException("short readBytes");
+            }
+        }
+        else
+        {
+            ::std::vector<uno::Sequence<sal_Int8>> bufs;
+            bool isDone(false);
+            do
+            {
+                bufs.emplace_back();
+                isDone = (**pxInStream).readSomeBytes(bufs.back(), 65536) == 0;
+            } while (!isDone);
+            sal_Int32 nSize(0);
+            for (auto const& rBuf : bufs)
+            {
+                if (o3tl::checked_add(nSize, rBuf.getLength(), nSize))
+                {
+                    throw std::bad_alloc(); // too large for Sequence
+                }
+            }
+            data.realloc(nSize);
+            size_t nCopied(0);
+            for (auto const& rBuf : bufs)
+            {
+                ::std::memcpy(data.getArray() + nCopied, rBuf.getConstArray(), rBuf.getLength());
+                nCopied += rBuf.getLength(); // can't overflow
+            }
+        }
+    }
+
+    // Clear flag before transfer starts; only a transfer started before
+    // calling abort() will be aborted, not one started later.
+    rSession.m_AbortFlag.store(false);
+
+    Guard guard(rSession.m_Mutex, rOptions, rURI, rSession.m_pCurl.get());
+
+    // authentication data may be in the URI, or requested via XInteractionHandler
+    struct Auth
+    {
+        OUString UserName;
+        OUString PassWord;
+        decltype(CURLAUTH_ANY) AuthMask; ///< allowed auth methods
+        Auth(OUString const& rUserName, OUString const& rPassword,
+             decltype(CURLAUTH_ANY) const & rAuthMask)
+            : UserName(rUserName)
+            , PassWord(rPassword)
+            , AuthMask(rAuthMask)
+        {
+        }
+    };
+    ::std::optional<Auth> oAuth;
+    ::std::optional<Auth> oAuthProxy;
+    if (pEnv && !rSession.m_isAuthenticatedProxy && !rSession.m_Proxy.aName.isEmpty())
+    {
+        // the hope is that this must be a URI
+        CurlUri const uri(rSession.m_Proxy.aName);
+        if (!uri.GetUser().isEmpty() || !uri.GetPassword().isEmpty())
+        {
+            oAuthProxy.emplace(uri.GetUser(), uri.GetPassword(), CURLAUTH_ANY);
+        }
+    }
+    decltype(CURLAUTH_ANY) const authSystem(CURLAUTH_NEGOTIATE | CURLAUTH_NTLM | CURLAUTH_NTLM_WB);
+    if (pRequestedHeaders || (pEnv && !rSession.m_isAuthenticated))
+    {
+    // m_aRequestURI *may* be a path or *may* be URI - wtf
+    // TODO: why is there this m_aRequestURI and also rURIReference argument?
+    // ... only caller is DAVResourceAccess - always identical except MOVE/COPY
+    // which doesn't work if it's just a URI reference so let's just use
+    // rURIReference via rURI instead
+#if 0
+        CurlUri const uri(pEnv->m_aRequestURI);
+#endif
+        // note: due to parsing bug pwd didn't work in previous webdav ucps
+        if (pEnv && !rSession.m_isAuthenticated
+            && (!rURI.GetUser().isEmpty() || !rURI.GetPassword().isEmpty()))
+        {
+            oAuth.emplace(rURI.GetUser(), rURI.GetPassword(), CURLAUTH_ANY);
+        }
+        if (pRequestedHeaders)
+        {
+            // note: Previously this would be the rURIReference directly but
+            // that ends up in CurlUri anyway and curl is unhappy.
+            // But it looks like all consumers of this .uri are interested
+            // only in the path, so it shouldn't make a difference to give
+            // the entire URI when the caller extracts the path anyway.
+            pRequestedHeaders->second.uri = rURI.GetURI();
+            pRequestedHeaders->second.properties.clear();
+        }
+    }
+    bool isRetry(false);
+    bool isFallbackHTTP10(false);
+    int nAuthRequests(0);
+    int nAuthRequestsProxy(0);
+
+    // libcurl does not have an authentication callback so handle auth
+    // related status codes and requesting credentials via this loop
+    do
+    {
+        isRetry = false;
+
+        // re-check m_isAuthenticated flags every time, could have been set
+        // by re-entrant call
+        if (oAuth && !rSession.m_isAuthenticated)
+        {
+            OString const utf8UserName(OUStringToOString(oAuth->UserName, RTL_TEXTENCODING_UTF8));
+            auto rc
+                = curl_easy_setopt(rSession.m_pCurl.get(), CURLOPT_USERNAME, utf8UserName.getStr());
+            if (rc != CURLE_OK)
+            {
+                SAL_WARN("ucb.ucp.webdav.curl", "CURLOPT_USERNAME failed: " << GetErrorString(rc));
+                throw DAVException(DAVException::DAV_INVALID_ARG);
+            }
+            OString const utf8PassWord(OUStringToOString(oAuth->PassWord, RTL_TEXTENCODING_UTF8));
+            rc = curl_easy_setopt(rSession.m_pCurl.get(), CURLOPT_PASSWORD, utf8PassWord.getStr());
+            if (rc != CURLE_OK)
+            {
+                SAL_WARN("ucb.ucp.webdav.curl", "CURLOPT_PASSWORD failed: " << GetErrorString(rc));
+                throw DAVException(DAVException::DAV_INVALID_ARG);
+            }
+            rc = curl_easy_setopt(rSession.m_pCurl.get(), CURLOPT_HTTPAUTH, oAuth->AuthMask);
+            assert(
+                rc
+                == CURLE_OK); // it shouldn't be possible to reduce auth to 0 via the authSystem masks
+        }
+
+        if (oAuthProxy && !rSession.m_isAuthenticatedProxy)
+        {
+            OString const utf8UserName(
+                OUStringToOString(oAuthProxy->UserName, RTL_TEXTENCODING_UTF8));
+            auto rc = curl_easy_setopt(rSession.m_pCurl.get(), CURLOPT_PROXYUSERNAME,
+                                       utf8UserName.getStr());
+            if (rc != CURLE_OK)
+            {
+                SAL_WARN("ucb.ucp.webdav.curl",
+                         "CURLOPT_PROXYUSERNAME failed: " << GetErrorString(rc));
+                throw DAVException(DAVException::DAV_INVALID_ARG);
+            }
+            OString const utf8PassWord(
+                OUStringToOString(oAuthProxy->PassWord, RTL_TEXTENCODING_UTF8));
+            rc = curl_easy_setopt(rSession.m_pCurl.get(), CURLOPT_PROXYPASSWORD,
+                                  utf8PassWord.getStr());
+            if (rc != CURLE_OK)
+            {
+                SAL_WARN("ucb.ucp.webdav.curl",
+                         "CURLOPT_PROXYPASSWORD failed: " << GetErrorString(rc));
+                throw DAVException(DAVException::DAV_INVALID_ARG);
+            }
+            rc = curl_easy_setopt(rSession.m_pCurl.get(), CURLOPT_PROXYAUTH, oAuthProxy->AuthMask);
+            assert(
+                rc
+                == CURLE_OK); // it shouldn't be possible to reduce auth to 0 via the authSystem masks
+        }
+
+        ResponseHeaders headers(rSession.m_pCurl.get());
+        // always pass a stream for debug logging, buffer the result body
+        uno::Reference<io::XSequenceOutputStream> const xSeqOutStream(
+            io::SequenceOutputStream::create(rSession.m_xContext));
+        uno::Reference<io::XOutputStream> const xTempOutStream(xSeqOutStream);
+        assert(xTempOutStream.is());
+
+        try
+        {
+            ProcessRequestImpl(rSession, rURI, rMethod, pRequestHeaderList.get(), &xTempOutStream,
+                               pxInStream ? &data : nullptr, pRequestedHeaders, headers);
+            if (pxOutStream)
+            { // only copy to result stream if transfer was successful
+                (*pxOutStream)->writeBytes(xSeqOutStream->getWrittenBytes());
+                (*pxOutStream)->closeOutput(); // signal EOF
+            }
+        }
+        catch (DAVException const& rException)
+        {
+            // log start of request body if there was any
+            auto const bytes(xSeqOutStream->getWrittenBytes());
+            auto const len(::std::min<sal_Int32>(bytes.getLength(), 10000));
+            SAL_INFO("ucb.ucp.webdav.curl",
+                     "DAVException; (first) " << len << " bytes of data received:");
+            if (0 < len)
+            {
+                OStringBuffer buf(len);
+                for (sal_Int32 i = 0; i < len; ++i)
+                {
+                    if (bytes[i] < 0x20) // also if negative
+                    {
+                        static char const hexDigit[16] = { '0', '1', '2', '3', '4', '5', '6', '7',
+                                                           '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
+                        buf.append("\\x");
+                        buf.append(hexDigit[static_cast<sal_uInt8>(bytes[i]) >> 4]);
+                        buf.append(hexDigit[bytes[i] & 0x0F]);
+                    }
+                    else
+                    {
+                        buf.append(static_cast<char>(bytes[i]));
+                    }
+                }
+                SAL_INFO("ucb.ucp.webdav.curl", buf.makeStringAndClear());
+            }
+
+            // error handling part 3: special HTTP status codes
+            // that require unlocking m_Mutex to handle
+            if (rException.getError() == DAVException::DAV_HTTP_ERROR)
+            {
+                auto const statusCode(rException.getStatus());
+                switch (statusCode)
+                {
+                    case SC_LOCKED:
+                    {
+                        guard.Release(); // release m_Mutex before accessing LockStore
+                        if (g_Init.LockStore.getLockTokenForURI(rURI.GetURI(), nullptr))
+                        {
+                            throw DAVException(DAVException::DAV_LOCKED_SELF);
+                        }
+                        else // locked by third party
+                        {
+                            throw DAVException(DAVException::DAV_LOCKED);
+                        }
+                        break;
+                    }
+                    case SC_PRECONDITION_FAILED:
+                    case SC_BAD_REQUEST:
+                    {
+                        guard.Release(); // release m_Mutex before accessing LockStore
+                        // Not obvious but apparently these codes may indicate
+                        // the expiration of a lock.
+                        // Initiate a new request *outside* ProcessRequestImpl
+                        // *after* rGuard.unlock() to avoid messing up m_pCurl state.
+                        if (TryRemoveExpiredLockToken(rSession, rURI, pEnv))
+                        {
+                            throw DAVException(DAVException::DAV_LOCK_EXPIRED);
+                        }
+                        break;
+                    }
+                    case SC_UNAUTHORIZED:
+                    case SC_PROXY_AUTHENTICATION_REQUIRED:
+                    {
+                        auto& rnAuthRequests(statusCode == SC_UNAUTHORIZED ? nAuthRequests
+                                                                           : nAuthRequestsProxy);
+                        if (rnAuthRequests == 10)
+                        {
+                            SAL_INFO("ucb.ucp.webdav.curl", "aborting authentication after "
+                                                                << rnAuthRequests << " attempts");
+                        }
+                        else if (pEnv && pEnv->m_xAuthListener)
+                        {
+                            ::std::optional<OUString> const oRealm(ExtractRealm(
+                                headers, statusCode == SC_UNAUTHORIZED ? "WWW-Authenticate"
+                                                                       : "Proxy-Authenticate"));
+
+                            ::std::optional<Auth>& roAuth(
+                                statusCode == SC_UNAUTHORIZED ? oAuth : oAuthProxy);
+                            OUString userName(roAuth ? roAuth->UserName : OUString());
+                            OUString passWord(roAuth ? roAuth->PassWord : OUString());
+                            long authAvail(0);
+                            auto const rc = curl_easy_getinfo(rSession.m_pCurl.get(),
+                                                              statusCode == SC_UNAUTHORIZED
+                                                                  ? CURLINFO_HTTPAUTH_AVAIL
+                                                                  : CURLINFO_PROXYAUTH_AVAIL,
+                                                              &authAvail);
+                            assert(rc == CURLE_OK);
+                            (void)rc;
+                            // only allow SystemCredentials once - the
+                            // PasswordContainer may have stored it in the
+                            // Config (TrySystemCredentialsFirst or
+                            // AuthenticateUsingSystemCredentials) and then it
+                            // will always force its use no matter how hopeless
+                            bool const isSystemCredSupported((authAvail & authSystem) != 0
+                                                             && rnAuthRequests == 0);
+                            ++rnAuthRequests;
+
+                            // Ask user via XInteractionHandler.
+                            // Warning: This likely runs an event loop which may
+                            // end up calling back into this instance, so all
+                            // changes to m_pCurl must be undone now and
+                            // restored after return.
+                            guard.Release();
+
+                            auto const ret = pEnv->m_xAuthListener->authenticate(
+                                oRealm ? *oRealm : "",
+                                statusCode == SC_UNAUTHORIZED ? rSession.m_URI.GetHost()
+                                                              : rSession.m_Proxy.aName,
+                                userName, passWord, isSystemCredSupported);
+
+                            if (ret == 0)
+                            {
+                                // NTLM may either use a password requested
+                                // from the user, or from the system via SSPI
+                                // so i guess it should not be disabled here
+                                // regardless of the state of the system auth
+                                // checkbox, particularly since SSPI is only
+                                // available on WNT.
+                                // Additionally, "Negotiate" has a "legacy"
+                                // mode that is actually just NTLM according to
+                                // https://curl.se/rfc/ntlm.html#ntlmHttpAuthentication
+                                // so there's nothing in authSystem that can be
+                                // disabled here.
+                                roAuth.emplace(userName, passWord,
+                                               ((userName.isEmpty() && passWord.isEmpty())
+                                                    ? (authAvail & authSystem)
+                                                    : authAvail));
+                                isRetry = true;
+                                // Acquire is only necessary in case of success.
+                                guard.Acquire();
+                                break; // break out of switch
+                            }
+                            // else: throw
+                        }
+                        SAL_INFO("ucb.ucp.webdav.curl", "no auth credentials provided");
+                        throw DAVException(DAVException::DAV_HTTP_NOAUTH,
+                                           ConnectionEndPointString(rSession.m_URI.GetHost(),
+                                                                    rSession.m_URI.GetPort()));
+                        break;
+                    }
+                }
+            }
+            else if (rException.getError() == DAVException::DAV_UNSUPPORTED)
+            {
+                // tdf#152493 libcurl can't handle "Transfer-Encoding: chunked"
+                // in HTTP/1.1 100 Continue response.
+                // workaround: if HTTP/1.1 didn't work, try HTTP/1.0
+                // (but fallback only once - to prevent infinite loop)
+                if (isFallbackHTTP10)
+                {
+                    throw DAVException(DAVException::DAV_HTTP_ERROR);
+                }
+                isFallbackHTTP10 = true;
+                // note: this is not reset - future requests to this URI use it!
+                auto rc = curl_easy_setopt(rSession.m_pCurl.get(), CURLOPT_HTTP_VERSION,
+                                           CURL_HTTP_VERSION_1_0);
+                if (rc != CURLE_OK)
+                {
+                    throw DAVException(DAVException::DAV_HTTP_ERROR);
+                }
+                SAL_INFO("ucb.ucp.webdav.curl", "attempting fallback to HTTP/1.0");
+                isRetry = true;
+            }
+            if (!isRetry)
+            {
+                throw; // everything else: re-throw
+            }
+        }
+    } while (isRetry);
+
+    if (oAuth)
+    {
+        // assume this worked, leave auth data as stored in m_pCurl
+        rSession.m_isAuthenticated = true;
+    }
+    if (oAuthProxy)
+    {
+        // assume this worked, leave auth data as stored in m_pCurl
+        rSession.m_isAuthenticatedProxy = true;
+    }
+}
+
+auto CurlSession::OPTIONS(OUString const& rURIReference,
+
+                          DAVOptions& rOptions, DAVRequestEnvironment const& rEnv) -> void
+{
+    SAL_INFO("ucb.ucp.webdav.curl", "OPTIONS: " << rURIReference);
+
+    rOptions.init();
+
+    CurlUri const uri(CurlProcessor::URIReferenceToURI(*this, rURIReference));
+
+    ::std::vector<OUString> const headerNames{ "allow", "dav" };
+    DAVResource result;
+    ::std::pair<::std::vector<OUString> const&, DAVResource&> const headers(headerNames, result);
+
+    ::std::vector<CurlOption> const options{
+        g_NoBody, { CURLOPT_CUSTOMREQUEST, "OPTIONS", "CURLOPT_CUSTOMREQUEST" }
+    };
+
+    CurlProcessor::ProcessRequest(*this, uri, "OPTIONS", options, &rEnv, nullptr, nullptr, nullptr,
+                                  &headers);
+
+    for (auto const& it : result.properties)
+    {
+        OUString value;
+        it.Value >>= value;
+        SAL_INFO("ucb.ucp.webdav.curl", "OPTIONS: header: " << it.Name << ": " << value);
+        if (it.Name.equalsIgnoreAsciiCase("allow"))
+        {
+            rOptions.setAllowedMethods(value);
+        }
+        else if (it.Name.equalsIgnoreAsciiCase("dav"))
+        {
+            // see <http://tools.ietf.org/html/rfc4918#section-10.1>,
+            // <http://tools.ietf.org/html/rfc4918#section-18>,
+            // and <http://tools.ietf.org/html/rfc7230#section-3.2>
+            // we detect the class (1, 2 and 3), other elements (token, URL)
+            // are not used for now
+            auto const list(::comphelper::string::convertCommaSeparated(value));
+            for (OUString const& v : list)
+            {
+                if (v == "1")
+                {
+                    rOptions.setClass1();
+                }
+                else if (v == "2")
+                {
+                    rOptions.setClass2();
+                }
+                else if (v == "3")
+                {
+                    rOptions.setClass3();
+                }
+            }
+        }
+    }
+    if (rOptions.isClass2() || rOptions.isClass3())
+    {
+        if (g_Init.LockStore.getLockTokenForURI(uri.GetURI(), nullptr))
+        {
+            rOptions.setLocked();
+        }
+    }
+}
+
+auto CurlProcessor::PropFind(
+    CurlSession& rSession, CurlUri const& rURI, Depth const nDepth,
+    ::std::tuple<::std::vector<OUString> const&, ::std::vector<DAVResource>* const,
+                 ::std::vector<ucb::Lock>* const> const* const o_pRequestedProperties,
+    ::std::vector<DAVResourceInfo>* const o_pResourceInfos, DAVRequestEnvironment const& rEnv)
+    -> void
+{
+    assert((o_pRequestedProperties != nullptr) != (o_pResourceInfos != nullptr));
+    assert((o_pRequestedProperties == nullptr)
+           || (::std::get<1>(*o_pRequestedProperties) != nullptr)
+                  != (::std::get<2>(*o_pRequestedProperties) != nullptr));
+
+    ::std::unique_ptr<curl_slist, deleter_from_fn<curl_slist, curl_slist_free_all>> pList;
+    pList.reset(curl_slist_append(pList.release(), "Content-Type: application/xml"));
+    if (!pList)
+    {
+        throw uno::RuntimeException("curl_slist_append failed");
+    }
+    OString depth;
+    switch (nDepth)
+    {
+        case DAVZERO:
+            depth = "Depth: 0";
+            break;
+        case DAVONE:
+            depth = "Depth: 1";
+            break;
+        case DAVINFINITY:
+            depth = "Depth: infinity";
+            break;
+        default:
+            assert(false);
+    }
+    pList.reset(curl_slist_append(pList.release(), depth.getStr()));
+    if (!pList)
+    {
+        throw uno::RuntimeException("curl_slist_append failed");
+    }
+
+    uno::Reference<io::XSequenceOutputStream> const xSeqOutStream(
+        io::SequenceOutputStream::create(rSession.m_xContext));
+    uno::Reference<io::XOutputStream> const xRequestOutStream(xSeqOutStream);
+    assert(xRequestOutStream.is());
+
+    uno::Reference<xml::sax::XWriter> const xWriter(xml::sax::Writer::create(rSession.m_xContext));
+    xWriter->setOutputStream(xRequestOutStream);
+    xWriter->startDocument();
+    rtl::Reference<::comphelper::AttributeList> const pAttrList(new ::comphelper::AttributeList);
+    pAttrList->AddAttribute("xmlns", "CDATA", "DAV:");
+    xWriter->startElement("propfind", pAttrList);
+    if (o_pResourceInfos)
+    {
+        xWriter->startElement("propname", nullptr);
+        xWriter->endElement("propname");
+    }
+    else
+    {
+        if (::std::get<0>(*o_pRequestedProperties).empty())
+        {
+            xWriter->startElement("allprop", nullptr);
+            xWriter->endElement("allprop");
+        }
+        else
+        {
+            xWriter->startElement("prop", nullptr);
+            for (OUString const& rName : ::std::get<0>(*o_pRequestedProperties))
+            {
+                SerfPropName name;
+                DAVProperties::createSerfPropName(rName, name);
+                pAttrList->Clear();
+                pAttrList->AddAttribute("xmlns", "CDATA", OUString::createFromAscii(name.nspace));
+                xWriter->startElement(OUString::createFromAscii(name.name), pAttrList);
+                xWriter->endElement(OUString::createFromAscii(name.name));
+            }
+            xWriter->endElement("prop");
+        }
+    }
+    xWriter->endElement("propfind");
+    xWriter->endDocument();
+
+    uno::Reference<io::XInputStream> const xRequestInStream(
+        io::SequenceInputStream::createStreamFromSequence(rSession.m_xContext,
+                                                          xSeqOutStream->getWrittenBytes()));
+    assert(xRequestInStream.is());
+
+    curl_off_t const len(xSeqOutStream->getWrittenBytes().getLength());
+
+    ::std::vector<CurlOption> const options{
+        { CURLOPT_UPLOAD, 1L, nullptr },
+        { CURLOPT_CUSTOMREQUEST, "PROPFIND", "CURLOPT_CUSTOMREQUEST" },
+        // note: Sharepoint cannot handle "Transfer-Encoding: chunked"
+        { CURLOPT_INFILESIZE_LARGE, len, nullptr, CurlOption::Type::CurlOffT }
+    };
+
+    // stream for response
+    uno::Reference<io::XInputStream> const xResponseInStream(io::Pipe::create(rSession.m_xContext));
+    uno::Reference<io::XOutputStream> const xResponseOutStream(xResponseInStream, uno::UNO_QUERY);
+    assert(xResponseInStream.is());
+    assert(xResponseOutStream.is());
+
+    CurlProcessor::ProcessRequest(rSession, rURI, "PROPFIND", options, &rEnv, ::std::move(pList),
+                                  &xResponseOutStream, &xRequestInStream, nullptr);
+
+    if (o_pResourceInfos)
+    {
+        *o_pResourceInfos = parseWebDAVPropNameResponse(xResponseInStream);
+    }
+    else
+    {
+        if (::std::get<1>(*o_pRequestedProperties) != nullptr)
+        {
+            *::std::get<1>(*o_pRequestedProperties)
+                = parseWebDAVPropFindResponse(xResponseInStream);
+            for (DAVResource& it : *::std::get<1>(*o_pRequestedProperties))
+            {
+                // caller will give these uris to CurlUri so can't be relative
+                if (it.uri.startsWith("/"))
+                {
+                    try
+                    {
+                        it.uri = rSession.m_URI.CloneWithRelativeRefPathAbsolute(it.uri).GetURI();
+                    }
+                    catch (DAVException const&)
+                    {
+                        SAL_INFO("ucb.ucp.webdav.curl",
+                                 "PROPFIND: exception parsing uri " << it.uri);
+                    }
+                }
+            }
+        }
+        else
+        {
+            *::std::get<2>(*o_pRequestedProperties) = parseWebDAVLockResponse(xResponseInStream);
+        }
+    }
+}
+
+// DAV methods
+auto CurlSession::PROPFIND(OUString const& rURIReference, Depth const depth,
+                           ::std::vector<OUString> const& rPropertyNames,
+                           ::std::vector<DAVResource>& o_rResources,
+                           DAVRequestEnvironment const& rEnv) -> void
+{
+    SAL_INFO("ucb.ucp.webdav.curl", "PROPFIND: " << rURIReference << " " << depth);
+
+    CurlUri const uri(CurlProcessor::URIReferenceToURI(*this, rURIReference));
+
+    ::std::tuple<::std::vector<OUString> const&, ::std::vector<DAVResource>* const,
+                 ::std::vector<ucb::Lock>* const> const args(rPropertyNames, &o_rResources,
+                                                             nullptr);
+    return CurlProcessor::PropFind(*this, uri, depth, &args, nullptr, rEnv);
+}
+
+auto CurlSession::PROPFIND(OUString const& rURIReference, Depth const depth,
+                           ::std::vector<DAVResourceInfo>& o_rResourceInfos,
+                           DAVRequestEnvironment const& rEnv) -> void
+{
+    SAL_INFO("ucb.ucp.webdav.curl", "PROPFIND: " << rURIReference << " " << depth);
+
+    CurlUri const uri(CurlProcessor::URIReferenceToURI(*this, rURIReference));
+
+    return CurlProcessor::PropFind(*this, uri, depth, nullptr, &o_rResourceInfos, rEnv);
+}
+
+auto CurlSession::PROPPATCH(OUString const& rURIReference,
+                            ::std::vector<ProppatchValue> const& rValues,
+                            DAVRequestEnvironment const& rEnv) -> void
+{
+    SAL_INFO("ucb.ucp.webdav.curl", "PROPPATCH: " << rURIReference);
+
+    CurlUri const uri(CurlProcessor::URIReferenceToURI(*this, rURIReference));
+
+    // TODO: either set CURLOPT_INFILESIZE_LARGE or chunked?
+    ::std::unique_ptr<curl_slist, deleter_from_fn<curl_slist, curl_slist_free_all>> pList;
+    pList.reset(curl_slist_append(pList.release(), "Content-Type: application/xml"));
+    if (!pList)
+    {
+        throw uno::RuntimeException("curl_slist_append failed");
+    }
+
+    // generate XML document for PROPPATCH
+    uno::Reference<io::XSequenceOutputStream> const xSeqOutStream(
+        io::SequenceOutputStream::create(m_xContext));
+    uno::Reference<io::XOutputStream> const xRequestOutStream(xSeqOutStream);
+    assert(xRequestOutStream.is());
+    uno::Reference<xml::sax::XWriter> const xWriter(xml::sax::Writer::create(m_xContext));
+    xWriter->setOutputStream(xRequestOutStream);
+    xWriter->startDocument();
+    rtl::Reference<::comphelper::AttributeList> const pAttrList(new ::comphelper::AttributeList);
+    pAttrList->AddAttribute("xmlns", "CDATA", "DAV:");
+    xWriter->startElement("propertyupdate", pAttrList);
+    for (ProppatchValue const& rPropValue : rValues)
+    {
+        assert(rPropValue.operation == PROPSET || rPropValue.operation == PROPREMOVE);
+        OUString const operation((rPropValue.operation == PROPSET) ? OUString("set")
+                                                                   : OUString("remove"));
+        xWriter->startElement(operation, nullptr);
+        xWriter->startElement("prop", nullptr);
+        SerfPropName name;
+        DAVProperties::createSerfPropName(rPropValue.name, name);
+        pAttrList->Clear();
+        pAttrList->AddAttribute("xmlns", "CDATA", OUString::createFromAscii(name.nspace));
+        xWriter->startElement(OUString::createFromAscii(name.name), pAttrList);
+        if (rPropValue.operation == PROPSET)
+        {
+            if (DAVProperties::isUCBDeadProperty(name))
+            {
+                ::std::optional<::std::pair<OUString, OUString>> const oProp(
+                    UCBDeadPropertyValue::toXML(rPropValue.value));
+                if (oProp)
+                {
+                    xWriter->startElement("ucbprop", nullptr);
+                    xWriter->startElement("type", nullptr);
+                    xWriter->characters(oProp->first);
+                    xWriter->endElement("type");
+                    xWriter->startElement("value", nullptr);
+                    xWriter->characters(oProp->second);
+                    xWriter->endElement("value");
+                    xWriter->endElement("ucbprop");
+                }
+            }
+            else
+            {
+                OUString value;
+                rPropValue.value >>= value;
+                xWriter->characters(value);
+            }
+        }
+        xWriter->endElement(OUString::createFromAscii(name.name));
+        xWriter->endElement("prop");
+        xWriter->endElement(operation);
+    }
+    xWriter->endElement("propertyupdate");
+    xWriter->endDocument();
+
+    uno::Reference<io::XInputStream> const xRequestInStream(
+        io::SequenceInputStream::createStreamFromSequence(m_xContext,
+                                                          xSeqOutStream->getWrittenBytes()));
+    assert(xRequestInStream.is());
+
+    curl_off_t const len(xSeqOutStream->getWrittenBytes().getLength());
+
+    ::std::vector<CurlOption> const options{
+        { CURLOPT_UPLOAD, 1L, nullptr },
+        { CURLOPT_CUSTOMREQUEST, "PROPPATCH", "CURLOPT_CUSTOMREQUEST" },
+        // note: Sharepoint cannot handle "Transfer-Encoding: chunked"
+        { CURLOPT_INFILESIZE_LARGE, len, nullptr, CurlOption::Type::CurlOffT }
+    };
+
+    CurlProcessor::ProcessRequest(*this, uri, "PROPPATCH", options, &rEnv, ::std::move(pList),
+                                  nullptr, &xRequestInStream, nullptr);
+}
+
+auto CurlSession::HEAD(OUString const& rURIReference, ::std::vector<OUString> const& rHeaderNames,
+                       DAVResource& io_rResource, DAVRequestEnvironment const& rEnv) -> void
+{
+    SAL_INFO("ucb.ucp.webdav.curl", "HEAD: " << rURIReference);
+
+    CurlUri const uri(CurlProcessor::URIReferenceToURI(*this, rURIReference));
+
+    ::std::vector<CurlOption> const options{ g_NoBody };
+
+    ::std::pair<::std::vector<OUString> const&, DAVResource&> const headers(rHeaderNames,
+                                                                            io_rResource);
+
+    CurlProcessor::ProcessRequest(*this, uri, "HEAD", options, &rEnv, nullptr, nullptr, nullptr,
+                                  &headers);
+}
+
+auto CurlSession::GET(OUString const& rURIReference, DAVRequestEnvironment const& rEnv)
+    -> uno::Reference<io::XInputStream>
+{
+    SAL_INFO("ucb.ucp.webdav.curl", "GET: " << rURIReference);
+
+    CurlUri const uri(CurlProcessor::URIReferenceToURI(*this, rURIReference));
+
+    // could use either com.sun.star.io.Pipe or com.sun.star.io.SequenceInputStream?
+    // Pipe can just write into its XOuputStream, which is simpler.
+    // Both resize exponentially, so performance should be fine.
+    // However, Pipe doesn't implement XSeekable, which is required by filters.
+
+    uno::Reference<io::XSequenceOutputStream> const xSeqOutStream(
+        io::SequenceOutputStream::create(m_xContext));
+    uno::Reference<io::XOutputStream> const xResponseOutStream(xSeqOutStream);
+    assert(xResponseOutStream.is());
+
+    ::std::vector<CurlOption> const options{ { CURLOPT_HTTPGET, 1L, nullptr } };
+
+    CurlProcessor::ProcessRequest(*this, uri, "GET", options, &rEnv, nullptr, &xResponseOutStream,
+                                  nullptr, nullptr);
+
+    uno::Reference<io::XInputStream> const xResponseInStream(
+        io::SequenceInputStream::createStreamFromSequence(m_xContext,
+                                                          xSeqOutStream->getWrittenBytes()));
+    assert(xResponseInStream.is());
+
+    return xResponseInStream;
+}
+
+auto CurlSession::GET(OUString const& rURIReference, uno::Reference<io::XOutputStream>& rxOutStream,
+                      DAVRequestEnvironment const& rEnv) -> void
+{
+    SAL_INFO("ucb.ucp.webdav.curl", "GET: " << rURIReference);
+
+    CurlUri const uri(CurlProcessor::URIReferenceToURI(*this, rURIReference));
+
+    ::std::vector<CurlOption> const options{ { CURLOPT_HTTPGET, 1L, nullptr } };
+
+    CurlProcessor::ProcessRequest(*this, uri, "GET", options, &rEnv, nullptr, &rxOutStream, nullptr,
+                                  nullptr);
+}
+
+auto CurlSession::GET(OUString const& rURIReference, ::std::vector<OUString> const& rHeaderNames,
+                      DAVResource& io_rResource, DAVRequestEnvironment const& rEnv)
+    -> uno::Reference<io::XInputStream>
+{
+    SAL_INFO("ucb.ucp.webdav.curl", "GET: " << rURIReference);
+
+    CurlUri const uri(CurlProcessor::URIReferenceToURI(*this, rURIReference));
+
+    ::std::vector<CurlOption> const options{ { CURLOPT_HTTPGET, 1L, nullptr } };
+
+    uno::Reference<io::XSequenceOutputStream> const xSeqOutStream(
+        io::SequenceOutputStream::create(m_xContext));
+    uno::Reference<io::XOutputStream> const xResponseOutStream(xSeqOutStream);
+    assert(xResponseOutStream.is());
+
+    ::std::pair<::std::vector<OUString> const&, DAVResource&> const headers(rHeaderNames,
+                                                                            io_rResource);
+
+    CurlProcessor::ProcessRequest(*this, uri, "GET", options, &rEnv, nullptr, &xResponseOutStream,
+                                  nullptr, &headers);
+
+    uno::Reference<io::XInputStream> const xResponseInStream(
+        io::SequenceInputStream::createStreamFromSequence(m_xContext,
+                                                          xSeqOutStream->getWrittenBytes()));
+    assert(xResponseInStream.is());
+
+    return xResponseInStream;
+}
+
+auto CurlSession::GET(OUString const& rURIReference, uno::Reference<io::XOutputStream>& rxOutStream,
+                      ::std::vector<OUString> const& rHeaderNames, DAVResource& io_rResource,
+                      DAVRequestEnvironment const& rEnv) -> void
+{
+    SAL_INFO("ucb.ucp.webdav.curl", "GET: " << rURIReference);
+
+    CurlUri const uri(CurlProcessor::URIReferenceToURI(*this, rURIReference));
+
+    ::std::vector<CurlOption> const options{ { CURLOPT_HTTPGET, 1L, nullptr } };
+
+    ::std::pair<::std::vector<OUString> const&, DAVResource&> const headers(rHeaderNames,
+                                                                            io_rResource);
+
+    CurlProcessor::ProcessRequest(*this, uri, "GET", options, &rEnv, nullptr, &rxOutStream, nullptr,
+                                  &headers);
+}
+
+auto CurlSession::PUT(OUString const& rURIReference,
+                      uno::Reference<io::XInputStream> const& rxInStream,
+                      DAVRequestEnvironment const& rEnv) -> void
+{
+    SAL_INFO("ucb.ucp.webdav.curl", "PUT: " << rURIReference);
+
+    CurlUri const uri(CurlProcessor::URIReferenceToURI(*this, rURIReference));
+
+    // NextCloud silently fails with chunked encoding
+    uno::Reference<io::XSeekable> const xSeekable(rxInStream, uno::UNO_QUERY);
+    if (!xSeekable.is())
+    {
+        throw uno::RuntimeException("TODO: not seekable");
+    }
+    curl_off_t const len(xSeekable->getLength() - xSeekable->getPosition());
+
+    ::std::unique_ptr<curl_slist, deleter_from_fn<curl_slist, curl_slist_free_all>> pList;
+    OUString const* const pToken(g_Init.LockStore.getLockTokenForURI(uri.GetURI(), nullptr));
+    if (pToken)
+    {
+        OString const utf8If("If: "
+        // disabled as Sharepoint 2013 workaround, it accepts only
+        // "No-Tag-List", see fed2984281a85a5a2f308841ec810f218c75f2ab
+#if 0
+                "<" + OUStringToOString(rURIReference, RTL_TEXTENCODING_ASCII_US)
+                             + "> "
+#endif
+                             "(<"
+                             + OUStringToOString(*pToken, RTL_TEXTENCODING_ASCII_US) + ">)");
+        pList.reset(curl_slist_append(pList.release(), utf8If.getStr()));
+        if (!pList)
+        {
+            throw uno::RuntimeException("curl_slist_append failed");
+        }
+    }
+
+    // lock m_Mutex after accessing global LockStore to avoid deadlock
+
+    // note: Nextcloud 20 cannot handle "Transfer-Encoding: chunked"
+    ::std::vector<CurlOption> const options{
+        { CURLOPT_UPLOAD, 1L, nullptr }, // libcurl won't upload without setting this
+        { CURLOPT_INFILESIZE_LARGE, len, nullptr, CurlOption::Type::CurlOffT }
+    };
+
+    CurlProcessor::ProcessRequest(*this, uri, "PUT", options, &rEnv, ::std::move(pList), nullptr,
+                                  &rxInStream, nullptr);
+}
+
+auto CurlSession::POST(OUString const& rURIReference, OUString const& rContentType,
+                       OUString const& rReferer, uno::Reference<io::XInputStream> const& rxInStream,
+                       DAVRequestEnvironment const& rEnv) -> uno::Reference<io::XInputStream>
+{
+    SAL_INFO("ucb.ucp.webdav.curl", "POST: " << rURIReference);
+
+    CurlUri const uri(CurlProcessor::URIReferenceToURI(*this, rURIReference));
+
+    // TODO: either set CURLOPT_POSTFIELDSIZE_LARGE or chunked?
+    ::std::unique_ptr<curl_slist, deleter_from_fn<curl_slist, curl_slist_free_all>> pList(
+        curl_slist_append(nullptr, "Transfer-Encoding: chunked"));
+    if (!pList)
+    {
+        throw uno::RuntimeException("curl_slist_append failed");
+    }
+    OString const utf8ContentType("Content-Type: "
+                                  + OUStringToOString(rContentType, RTL_TEXTENCODING_ASCII_US));
+    pList.reset(curl_slist_append(pList.release(), utf8ContentType.getStr()));
+    if (!pList)
+    {
+        throw uno::RuntimeException("curl_slist_append failed");
+    }
+    OString const utf8Referer("Referer: " + OUStringToOString(rReferer, RTL_TEXTENCODING_ASCII_US));
+    pList.reset(curl_slist_append(pList.release(), utf8Referer.getStr()));
+    if (!pList)
+    {
+        throw uno::RuntimeException("curl_slist_append failed");
+    }
+
+    ::std::vector<CurlOption> const options{ { CURLOPT_POST, 1L, nullptr } };
+
+    uno::Reference<io::XSequenceOutputStream> const xSeqOutStream(
+        io::SequenceOutputStream::create(m_xContext));
+    uno::Reference<io::XOutputStream> const xResponseOutStream(xSeqOutStream);
+    assert(xResponseOutStream.is());
+
+    CurlProcessor::ProcessRequest(*this, uri, "POST", options, &rEnv, ::std::move(pList),
+                                  &xResponseOutStream, &rxInStream, nullptr);
+
+    uno::Reference<io::XInputStream> const xResponseInStream(
+        io::SequenceInputStream::createStreamFromSequence(m_xContext,
+                                                          xSeqOutStream->getWrittenBytes()));
+    assert(xResponseInStream.is());
+
+    return xResponseInStream;
+}
+
+auto CurlSession::POST(OUString const& rURIReference, OUString const& rContentType,
+                       OUString const& rReferer, uno::Reference<io::XInputStream> const& rxInStream,
+                       uno::Reference<io::XOutputStream>& rxOutStream,
+                       DAVRequestEnvironment const& rEnv) -> void
+{
+    SAL_INFO("ucb.ucp.webdav.curl", "POST: " << rURIReference);
+
+    CurlUri const uri(CurlProcessor::URIReferenceToURI(*this, rURIReference));
+
+    // TODO: either set CURLOPT_POSTFIELDSIZE_LARGE or chunked?
+    ::std::unique_ptr<curl_slist, deleter_from_fn<curl_slist, curl_slist_free_all>> pList(
+        curl_slist_append(nullptr, "Transfer-Encoding: chunked"));
+    if (!pList)
+    {
+        throw uno::RuntimeException("curl_slist_append failed");
+    }
+    OString const utf8ContentType("Content-Type: "
+                                  + OUStringToOString(rContentType, RTL_TEXTENCODING_ASCII_US));
+    pList.reset(curl_slist_append(pList.release(), utf8ContentType.getStr()));
+    if (!pList)
+    {
+        throw uno::RuntimeException("curl_slist_append failed");
+    }
+    OString const utf8Referer("Referer: " + OUStringToOString(rReferer, RTL_TEXTENCODING_ASCII_US));
+    pList.reset(curl_slist_append(pList.release(), utf8Referer.getStr()));
+    if (!pList)
+    {
+        throw uno::RuntimeException("curl_slist_append failed");
+    }
+
+    ::std::vector<CurlOption> const options{ { CURLOPT_POST, 1L, nullptr } };
+
+    CurlProcessor::ProcessRequest(*this, uri, "POST", options, &rEnv, ::std::move(pList),
+                                  &rxOutStream, &rxInStream, nullptr);
+}
+
+auto CurlSession::MKCOL(OUString const& rURIReference, DAVRequestEnvironment const& rEnv) -> void
+{
+    SAL_INFO("ucb.ucp.webdav.curl", "MKCOL: " << rURIReference);
+
+    CurlUri const uri(CurlProcessor::URIReferenceToURI(*this, rURIReference));
+
+    ::std::vector<CurlOption> const options{
+        g_NoBody, { CURLOPT_CUSTOMREQUEST, "MKCOL", "CURLOPT_CUSTOMREQUEST" }
+    };
+
+    CurlProcessor::ProcessRequest(*this, uri, "MKCOL", options, &rEnv, nullptr, nullptr, nullptr,
+                                  nullptr);
+}
+
+auto CurlProcessor::MoveOrCopy(CurlSession& rSession, OUString const& rSourceURIReference,
+                               ::std::u16string_view const rDestinationURI,
+                               DAVRequestEnvironment const& rEnv, bool const isOverwrite,
+                               char const* const pMethod) -> void
+{
+    CurlUri const uriSource(CurlProcessor::URIReferenceToURI(rSession, rSourceURIReference));
+
+    OString const utf8Destination("Destination: "
+                                  + OUStringToOString(rDestinationURI, RTL_TEXTENCODING_ASCII_US));
+    ::std::unique_ptr<curl_slist, deleter_from_fn<curl_slist, curl_slist_free_all>> pList(
+        curl_slist_append(nullptr, utf8Destination.getStr()));
+    if (!pList)
+    {
+        throw uno::RuntimeException("curl_slist_append failed");
+    }
+    OString const utf8Overwrite(OString::Concat("Overwrite: ") + (isOverwrite ? "T" : "F"));
+    pList.reset(curl_slist_append(pList.release(), utf8Overwrite.getStr()));
+    if (!pList)
+    {
+        throw uno::RuntimeException("curl_slist_append failed");
+    }
+
+    ::std::vector<CurlOption> const options{
+        g_NoBody, { CURLOPT_CUSTOMREQUEST, pMethod, "CURLOPT_CUSTOMREQUEST" }
+    };
+
+    CurlProcessor::ProcessRequest(rSession, uriSource, OUString::createFromAscii(pMethod), options,
+                                  &rEnv, ::std::move(pList), nullptr, nullptr, nullptr);
+}
+
+auto CurlSession::COPY(OUString const& rSourceURIReference, OUString const& rDestinationURI,
+                       DAVRequestEnvironment const& rEnv, bool const isOverwrite) -> void
+{
+    SAL_INFO("ucb.ucp.webdav.curl", "COPY: " << rSourceURIReference);
+
+    return CurlProcessor::MoveOrCopy(*this, rSourceURIReference, rDestinationURI, rEnv, isOverwrite,
+                                     "COPY");
+}
+
+auto CurlSession::MOVE(OUString const& rSourceURIReference, OUString const& rDestinationURI,
+                       DAVRequestEnvironment const& rEnv, bool const isOverwrite) -> void
+{
+    SAL_INFO("ucb.ucp.webdav.curl", "MOVE: " << rSourceURIReference);
+
+    return CurlProcessor::MoveOrCopy(*this, rSourceURIReference, rDestinationURI, rEnv, isOverwrite,
+                                     "MOVE");
+}
+
+auto CurlSession::DESTROY(OUString const& rURIReference, DAVRequestEnvironment const& rEnv) -> void
+{
+    SAL_INFO("ucb.ucp.webdav.curl", "DESTROY: " << rURIReference);
+
+    CurlUri const uri(CurlProcessor::URIReferenceToURI(*this, rURIReference));
+
+    ::std::vector<CurlOption> const options{
+        g_NoBody, { CURLOPT_CUSTOMREQUEST, "DELETE", "CURLOPT_CUSTOMREQUEST" }
+    };
+
+    CurlProcessor::ProcessRequest(*this, uri, "DESTROY", options, &rEnv, nullptr, nullptr, nullptr,
+                                  nullptr);
+}
+
+auto CurlProcessor::Lock(
+    CurlSession& rSession, CurlUri const& rURI, DAVRequestEnvironment const* const pEnv,
+    ::std::unique_ptr<curl_slist, deleter_from_fn<curl_slist, curl_slist_free_all>>
+        pRequestHeaderList,
+    uno::Reference<io::XInputStream> const* const pxRequestInStream)
+    -> ::std::vector<::std::pair<ucb::Lock, sal_Int32>>
+{
+    curl_off_t len(0);
+    if (pxRequestInStream)
+    {
+        uno::Reference<io::XSeekable> const xSeekable(*pxRequestInStream, uno::UNO_QUERY);
+        assert(xSeekable.is());
+        len = xSeekable->getLength();
+    }
+
+    ::std::vector<CurlOption> const options{
+        { CURLOPT_UPLOAD, 1L, nullptr },
+        { CURLOPT_CUSTOMREQUEST, "LOCK", "CURLOPT_CUSTOMREQUEST" },
+        // note: Sharepoint cannot handle "Transfer-Encoding: chunked"
+        { CURLOPT_INFILESIZE_LARGE, len, nullptr, CurlOption::Type::CurlOffT }
+    };
+
+    // stream for response
+    uno::Reference<io::XInputStream> const xResponseInStream(io::Pipe::create(rSession.m_xContext));
+    uno::Reference<io::XOutputStream> const xResponseOutStream(xResponseInStream, uno::UNO_QUERY);
+    assert(xResponseInStream.is());
+    assert(xResponseOutStream.is());
+
+    TimeValue startTime;
+    osl_getSystemTime(&startTime);
+
+    CurlProcessor::ProcessRequest(rSession, rURI, "LOCK", options, pEnv,
+                                  ::std::move(pRequestHeaderList), &xResponseOutStream,
+                                  pxRequestInStream, nullptr);
+
+    ::std::vector<ucb::Lock> const acquiredLocks(parseWebDAVLockResponse(xResponseInStream));
+    SAL_WARN_IF(acquiredLocks.empty(), "ucb.ucp.webdav.curl",
+                "could not get LOCK for " << rURI.GetURI());
+
+    TimeValue endTime;
+    osl_getSystemTime(&endTime);
+    auto const elapsedSeconds(endTime.Seconds - startTime.Seconds);
+
+    // determine expiration time (seconds from endTime) for each acquired lock
+    ::std::vector<::std::pair<ucb::Lock, sal_Int32>> ret;
+    ret.reserve(acquiredLocks.size());
+    for (auto const& rLock : acquiredLocks)
+    {
+        sal_Int32 lockExpirationTimeSeconds;
+        if (rLock.Timeout == -1)
+        {
+            lockExpirationTimeSeconds = -1;
+        }
+        else if (rLock.Timeout <= elapsedSeconds)
+        {
+            SAL_WARN("ucb.ucp.webdav.curl",
+                     "LOCK timeout already expired when receiving LOCK response for "
+                         << rURI.GetURI());
+            lockExpirationTimeSeconds = 0;
+        }
+        else
+        {
+            lockExpirationTimeSeconds = startTime.Seconds + rLock.Timeout;
+        }
+        ret.emplace_back(rLock, lockExpirationTimeSeconds);
+    }
+
+    return ret;
+}
+
+auto CurlSession::LOCK(OUString const& rURIReference, ucb::Lock /*const*/& rLock,
+                       DAVRequestEnvironment const& rEnv) -> void
+{
+    SAL_INFO("ucb.ucp.webdav.curl", "LOCK: " << rURIReference);
+
+    CurlUri const uri(CurlProcessor::URIReferenceToURI(*this, rURIReference));
+
+    if (g_Init.LockStore.getLockTokenForURI(uri.GetURI(), &rLock))
+    {
+        // already have a lock that covers the requirement
+        // TODO: maybe use DAV:lockdiscovery to ensure it's valid
+        return;
+    }
+
+    // note: no m_Mutex lock needed here, only in CurlProcessor::Lock()
+
+    // generate XML document for acquiring new LOCK
+    uno::Reference<io::XSequenceOutputStream> const xSeqOutStream(
+        io::SequenceOutputStream::create(m_xContext));
+    uno::Reference<io::XOutputStream> const xRequestOutStream(xSeqOutStream);
+    assert(xRequestOutStream.is());
+    uno::Reference<xml::sax::XWriter> const xWriter(xml::sax::Writer::create(m_xContext));
+    xWriter->setOutputStream(xRequestOutStream);
+    xWriter->startDocument();
+    rtl::Reference<::comphelper::AttributeList> const pAttrList(new ::comphelper::AttributeList);
+    pAttrList->AddAttribute("xmlns", "CDATA", "DAV:");
+    xWriter->startElement("lockinfo", pAttrList);
+    xWriter->startElement("lockscope", nullptr);
+    switch (rLock.Scope)
+    {
+        case ucb::LockScope_EXCLUSIVE:
+            xWriter->startElement("exclusive", nullptr);
+            xWriter->endElement("exclusive");
+            break;
+        case ucb::LockScope_SHARED:
+            xWriter->startElement("shared", nullptr);
+            xWriter->endElement("shared");
+            break;
+        default:
+            assert(false);
+    }
+    xWriter->endElement("lockscope");
+    xWriter->startElement("locktype", nullptr);
+    xWriter->startElement("write", nullptr);
+    xWriter->endElement("write");
+    xWriter->endElement("locktype");
+    OUString owner;
+    if ((rLock.Owner >>= owner) && !owner.isEmpty())
+    {
+        xWriter->startElement("owner", nullptr);
+        xWriter->characters(owner);
+        xWriter->endElement("owner");
+    }
+    xWriter->endElement("lockinfo");
+    xWriter->endDocument();
+
+    uno::Reference<io::XInputStream> const xRequestInStream(
+        io::SequenceInputStream::createStreamFromSequence(m_xContext,
+                                                          xSeqOutStream->getWrittenBytes()));
+    assert(xRequestInStream.is());
+
+    ::std::unique_ptr<curl_slist, deleter_from_fn<curl_slist, curl_slist_free_all>> pList;
+    pList.reset(curl_slist_append(pList.release(), "Content-Type: application/xml"));
+    if (!pList)
+    {
+        throw uno::RuntimeException("curl_slist_append failed");
+    }
+    OString depth;
+    switch (rLock.Depth)
+    {
+        case ucb::LockDepth_ZERO:
+            depth = "Depth: 0";
+            break;
+        case ucb::LockDepth_ONE:
+            depth = "Depth: 1";
+            break;
+        case ucb::LockDepth_INFINITY:
+            depth = "Depth: infinity";
+            break;
+        default:
+            assert(false);
+    }
+    pList.reset(curl_slist_append(pList.release(), depth.getStr()));
+    if (!pList)
+    {
+        throw uno::RuntimeException("curl_slist_append failed");
+    }
+    OString timeout;
+    switch (rLock.Timeout)
+    {
+        case -1:
+            timeout = "Timeout: Infinite";
+            break;
+        case 0:
+            timeout = "Timeout: Second-180";
+            break;
+        default:
+            timeout = "Timeout: Second-" + OString::number(rLock.Timeout);
+            assert(0 < rLock.Timeout);
+            break;
+    }
+    pList.reset(curl_slist_append(pList.release(), timeout.getStr()));
+    if (!pList)
+    {
+        throw uno::RuntimeException("curl_slist_append failed");
+    }
+
+    auto const acquiredLocks
+        = CurlProcessor::Lock(*this, uri, &rEnv, ::std::move(pList), &xRequestInStream);
+
+    for (auto const& rAcquiredLock : acquiredLocks)
+    {
+        g_Init.LockStore.addLock(uri.GetURI(), rAcquiredLock.first,
+                                 rAcquiredLock.first.LockTokens[0], this, rAcquiredLock.second);
+        SAL_INFO("ucb.ucp.webdav.curl", "created LOCK for " << rURIReference);
+    }
+}
+
+auto CurlProcessor::Unlock(CurlSession& rSession, CurlUri const& rURI,
+                           DAVRequestEnvironment const* const pEnv) -> void
+{
+    OUString const* const pToken(g_Init.LockStore.getLockTokenForURI(rURI.GetURI(), nullptr));
+    if (!pToken)
+    {
+        SAL_WARN("ucb.ucp.webdav.curl", "attempt to unlock but not locked");
+        throw DAVException(DAVException::DAV_NOT_LOCKED);
+    }
+    OString const utf8LockToken("Lock-Token: <"
+                                + OUStringToOString(*pToken, RTL_TEXTENCODING_ASCII_US) + ">");
+    ::std::unique_ptr<curl_slist, deleter_from_fn<curl_slist, curl_slist_free_all>> pList(
+        curl_slist_append(nullptr, utf8LockToken.getStr()));
+    if (!pList)
+    {
+        throw uno::RuntimeException("curl_slist_append failed");
+    }
+
+    ::std::vector<CurlOption> const options{ { CURLOPT_CUSTOMREQUEST, "UNLOCK",
+                                               "CURLOPT_CUSTOMREQUEST" } };
+
+    CurlProcessor::ProcessRequest(rSession, rURI, "UNLOCK", options, pEnv, ::std::move(pList),
+                                  nullptr, nullptr, nullptr);
+}
+
+auto CurlSession::UNLOCK(OUString const& rURIReference, DAVRequestEnvironment const& rEnv) -> void
+{
+    SAL_INFO("ucb.ucp.webdav.curl", "UNLOCK: " << rURIReference);
+
+    // note: no m_Mutex lock needed here, only in CurlProcessor::Unlock()
+
+    CurlUri const uri(CurlProcessor::URIReferenceToURI(*this, rURIReference));
+
+    CurlProcessor::Unlock(*this, uri, &rEnv);
+
+    g_Init.LockStore.removeLock(uri.GetURI());
+}
+
+auto CurlSession::NonInteractive_LOCK(OUString const& rURI, ::std::u16string_view const rLockToken,
+                                      sal_Int32& o_rLastChanceToSendRefreshRequest,
+                                      bool& o_rIsAuthFailed) -> bool
+{
+    SAL_INFO("ucb.ucp.webdav.curl", "NonInteractive_LOCK: " << rURI);
+
+    // note: no m_Mutex lock needed here, only in CurlProcessor::Lock()
+
+    try
+    {
+        CurlUri const uri(rURI);
+        ::std::unique_ptr<curl_slist, deleter_from_fn<curl_slist, curl_slist_free_all>> pList(
+            curl_slist_append(nullptr, "Timeout: Second-180"));
+
+        assert(!rLockToken.empty()); // LockStore is the caller
+        OString const utf8If("If: (<" + OUStringToOString(rLockToken, RTL_TEXTENCODING_ASCII_US)
+                             + ">)");
+        pList.reset(curl_slist_append(pList.release(), utf8If.getStr()));
+        if (!pList)
+        {
+            throw uno::RuntimeException("curl_slist_append failed");
+        }
+
+        auto const acquiredLocks
+            = CurlProcessor::Lock(*this, uri, nullptr, ::std::move(pList), nullptr);
+
+        SAL_WARN_IF(1 < acquiredLocks.size(), "ucb.ucp.webdav.curl",
+                    "multiple locks acquired on refresh for " << rURI);
+        if (!acquiredLocks.empty())
+        {
+            o_rLastChanceToSendRefreshRequest = acquiredLocks.begin()->second;
+        }
+        SAL_INFO("ucb.ucp.webdav.curl", "NonInteractive_LOCK succeeded on " << rURI);
+        return true;
+    }
+    catch (DAVException const& rException)
+    {
+        SAL_INFO("ucb.ucp.webdav.curl", "NonInteractive_LOCK failed on " << rURI);
+        switch (rException.getError())
+        {
+            case DAVException::DAV_HTTP_AUTH:
+            case DAVException::DAV_HTTP_NOAUTH:
+                o_rIsAuthFailed = true;
+                break;
+            default:
+                break;
+        }
+        return false;
+    }
+    catch (...)
+    {
+        SAL_INFO("ucb.ucp.webdav.curl", "NonInteractive_LOCK failed on " << rURI);
+        return false;
+    }
+}
+
+auto CurlSession::NonInteractive_UNLOCK(OUString const& rURI) -> void
+{
+    SAL_INFO("ucb.ucp.webdav.curl", "NonInteractive_UNLOCK: " << rURI);
+
+    // note: no m_Mutex lock needed here, only in CurlProcessor::Unlock()
+
+    try
+    {
+        CurlUri const uri(rURI);
+
+        CurlProcessor::Unlock(*this, uri, nullptr);
+
+        // the only caller is the dtor of the LockStore, don't call remove!
+        SAL_INFO("ucb.ucp.webdav.curl", "NonInteractive_UNLOCK succeeded on " << rURI);
+    }
+    catch (...)
+    {
+        SAL_INFO("ucb.ucp.webdav.curl", "NonInteractive_UNLOCK failed on " << rURI);
+    }
+}
+
+} // namespace http_dav_ucp
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/CurlSession.hxx b/ucb/source/ucp/webdav-curl/CurlSession.hxx
new file mode 100644
index 000000000..75ccf6826
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/CurlSession.hxx
@@ -0,0 +1,145 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#pragma once
+
+#include "DAVSession.hxx"
+#include "CurlUri.hxx"
+
+#include <curl/curl.h>
+
+#include <atomic>
+#include <mutex>
+
+namespace http_dav_ucp
+{
+/// implementation of libcurl HTTP/DAV back-end
+class CurlSession : public DAVSession
+{
+private:
+    /// mutex required to access all other non-const members
+    ::std::mutex m_Mutex;
+    css::uno::Reference<css::uno::XComponentContext> const m_xContext;
+    /// flags may be passed to constructor, e.g. "KeepAlive"
+    css::uno::Sequence<css::beans::NamedValue> const m_Flags;
+    CurlUri const m_URI;
+    /// buffer for libcurl detailed error messages
+    char m_ErrorBuffer[CURL_ERROR_SIZE];
+    /// proxy is used if aName is non-empty
+    ::ucbhelper::InternetProxyServer const m_Proxy;
+    /// once authentication was successful, rely on m_pCurl's data
+    bool m_isAuthenticated = false;
+    bool m_isAuthenticatedProxy = false;
+    /// read timeout in milliseconds (connection timeout is stored in m_pCurl)
+    int m_nReadTimeout = 0;
+    /// flag to signal abort to transferring thread
+    ::std::atomic<bool> m_AbortFlag = false;
+
+    /// libcurl multi handle
+    ::std::unique_ptr<CURLM, deleter_from_fn<CURLM, curl_multi_cleanup>> m_pCurlMulti;
+    /// libcurl easy handle
+    ::std::unique_ptr<CURL, deleter_from_fn<CURL, curl_easy_cleanup>> m_pCurl;
+
+    // this class exists just to hide the implementation details in cxx file
+    friend struct CurlProcessor;
+
+public:
+    explicit CurlSession(css::uno::Reference<css::uno::XComponentContext> const& xContext,
+                         ::rtl::Reference<DAVSessionFactory> const& rpFactory, OUString const& rURI,
+                         css::uno::Sequence<css::beans::NamedValue> const& rFlags,
+                         ::ucbhelper::InternetProxyDecider const& rProxyDecider);
+    virtual ~CurlSession() override;
+
+    virtual auto CanUse(OUString const& rURI,
+                        css::uno::Sequence<css::beans::NamedValue> const& rFlags) -> bool override;
+
+    virtual auto UsesProxy() -> bool override;
+
+    // DAV methods
+    virtual auto OPTIONS(OUString const& rURIReference, DAVOptions& rOptions,
+                         DAVRequestEnvironment const& rEnv) -> void override;
+
+    virtual auto PROPFIND(OUString const& rURIReference, Depth depth,
+                          ::std::vector<OUString> const& rPropertyNames,
+                          ::std::vector<DAVResource>& o_rResources,
+                          DAVRequestEnvironment const& rEnv) -> void override;
+
+    virtual auto PROPFIND(OUString const& rURIReference, Depth depth,
+                          ::std::vector<DAVResourceInfo>& o_rResourceInfos,
+                          DAVRequestEnvironment const& rEnv) -> void override;
+
+    virtual auto PROPPATCH(OUString const& rURIReference,
+                           ::std::vector<ProppatchValue> const& rValues,
+                           DAVRequestEnvironment const& rEnv) -> void override;
+
+    virtual auto HEAD(OUString const& rURIReference, ::std::vector<OUString> const& rHeaderNames,
+                      DAVResource& io_rResource, DAVRequestEnvironment const& rEnv)
+        -> void override;
+
+    virtual auto GET(OUString const& rURIReference, DAVRequestEnvironment const& rEnv)
+        -> css::uno::Reference<css::io::XInputStream> override;
+
+    virtual auto GET(OUString const& rURIReference,
+                     css::uno::Reference<css::io::XOutputStream>& rxOutStream,
+                     DAVRequestEnvironment const& rEnv) -> void override;
+
+    virtual auto GET(OUString const& rURIReference, ::std::vector<OUString> const& rHeaderNames,
+                     DAVResource& io_rResource, DAVRequestEnvironment const& rEnv)
+        -> css::uno::Reference<css::io::XInputStream> override;
+
+    virtual auto GET(OUString const& rURIReference,
+                     css::uno::Reference<css::io::XOutputStream>& rxOutStream,
+                     ::std::vector<OUString> const& rHeaderNames, DAVResource& io_rResource,
+                     DAVRequestEnvironment const& rEnv) -> void override;
+
+    virtual auto PUT(OUString const& rURIReference,
+                     css::uno::Reference<css::io::XInputStream> const& rxInStream,
+                     DAVRequestEnvironment const& rEnv) -> void override;
+
+    virtual auto POST(OUString const& rURIReference, OUString const& rContentType,
+                      OUString const& rReferer,
+                      css::uno::Reference<css::io::XInputStream> const& rxInStream,
+                      DAVRequestEnvironment const& rEnv)
+        -> css::uno::Reference<css::io::XInputStream> override;
+
+    virtual auto POST(OUString const& rURIReference, OUString const& rContentType,
+                      OUString const& rReferer,
+                      css::uno::Reference<css::io::XInputStream> const& rxInStream,
+                      css::uno::Reference<css::io::XOutputStream>& rxOutStream,
+                      DAVRequestEnvironment const& rEnv) -> void override;
+
+    virtual auto MKCOL(OUString const& rURIReference, DAVRequestEnvironment const& rEnv)
+        -> void override;
+
+    virtual auto COPY(OUString const& rSourceURIReference, OUString const& rDestinationURI,
+                      DAVRequestEnvironment const& rEnv, bool isOverwrite = false) -> void override;
+
+    virtual auto MOVE(OUString const& rSourceURIReference, OUString const& rDestinationURI,
+                      DAVRequestEnvironment const& rEnv, bool isOverwrite = false) -> void override;
+
+    virtual auto DESTROY(OUString const& rURIReference, DAVRequestEnvironment const& rEnv)
+        -> void override;
+
+    virtual auto LOCK(OUString const& rURIReference, css::ucb::Lock /*const*/& rLock,
+                      DAVRequestEnvironment const& rEnv) -> void override;
+
+    virtual auto UNLOCK(OUString const& rURIReference, DAVRequestEnvironment const& rEnv)
+        -> void override;
+
+    virtual auto abort() -> void override;
+
+    auto NonInteractive_LOCK(OUString const& rURI, ::std::u16string_view rLockToken,
+                             sal_Int32& o_rLastChanceToSendRefreshRequest, bool& o_rIsAuthFailed)
+        -> bool;
+    auto NonInteractive_UNLOCK(OUString const& rURI) -> void;
+};
+
+} // namespace http_dav_ucp
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/CurlUri.cxx b/ucb/source/ucp/webdav-curl/CurlUri.cxx
new file mode 100644
index 000000000..4dba6ac22
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/CurlUri.cxx
@@ -0,0 +1,328 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include "CurlUri.hxx"
+
+#include <sal/log.hxx>
+#include <rtl/uri.hxx>
+#include <rtl/ustrbuf.hxx>
+
+#include <optional>
+
+namespace http_dav_ucp
+{
+const auto DEFAULT_HTTP_PORT = 80;
+const auto DEFAULT_HTTPS_PORT = 443;
+
+static ::std::optional<OUString> GetURLComponent(CURLU& rURI, CURLUPart const what,
+                                                 CURLUcode const expected,
+                                                 unsigned int const flags = 0)
+{
+    char* pPart(nullptr);
+    auto uc = curl_url_get(&rURI, what, &pPart, flags);
+    if (expected != CURLUE_OK && uc == expected)
+    {
+        return ::std::optional<OUString>();
+    }
+    if (uc != CURLUE_OK)
+    {
+        SAL_WARN("ucb.ucp.webdav.curl", "curl_url_get failed: " << what << " " << uc);
+        throw DAVException(DAVException::DAV_INVALID_ARG);
+    }
+    assert(pPart);
+    CurlUniquePtr<char> pPart2(pPart);
+    return ::rtl::OStringToOUString(pPart, RTL_TEXTENCODING_UTF8);
+}
+
+void CurlUri::Init()
+{
+    // looks like the result should be the same as the old calculateURI()
+    auto const oURI(GetURLComponent(*m_pUrl, CURLUPART_URL, CURLUE_OK, CURLU_NO_DEFAULT_PORT));
+    assert(oURI);
+    m_URI = *oURI;
+
+    auto const oScheme(GetURLComponent(*m_pUrl, CURLUPART_SCHEME, CURLUE_NO_SCHEME));
+    if (oScheme)
+    {
+        m_Scheme = *oScheme;
+    }
+    auto const oUser(GetURLComponent(*m_pUrl, CURLUPART_USER, CURLUE_NO_USER));
+    if (oUser)
+    {
+        m_User = *oUser;
+    }
+    auto const oPassWord(GetURLComponent(*m_pUrl, CURLUPART_PASSWORD, CURLUE_NO_PASSWORD));
+    if (oPassWord)
+    {
+        m_Password = *oPassWord;
+    }
+    auto const oHost(GetURLComponent(*m_pUrl, CURLUPART_HOST, CURLUE_NO_HOST));
+    if (oHost)
+    {
+        m_Host = *oHost;
+    }
+    // DAV schemes always have port but Content::transfer() is called with
+    // arbitrary URLs so use CURLUE_NO_PORT
+    auto const oPort(GetURLComponent(*m_pUrl, CURLUPART_PORT, CURLUE_NO_PORT, CURLU_DEFAULT_PORT));
+    if (oPort)
+    {
+        m_nPort = oPort->toInt32();
+    }
+
+    auto const oPath(GetURLComponent(*m_pUrl, CURLUPART_PATH, CURLUE_OK));
+    assert(oPath);
+    m_Path = *oPath;
+
+    // note: this used to be added to m_Path because before 2007, ne_uri path contained query/fragment as well :-/
+    auto const oQuery(GetURLComponent(*m_pUrl, CURLUPART_QUERY, CURLUE_NO_QUERY));
+    if (oQuery)
+    {
+        m_QueryAndFragment += "?" + *oQuery;
+    }
+    auto const oFragment(GetURLComponent(*m_pUrl, CURLUPART_FRAGMENT, CURLUE_NO_FRAGMENT));
+    if (oFragment)
+    {
+        m_QueryAndFragment += "#" + *oFragment;
+    }
+}
+
+CurlUri::CurlUri(::std::u16string_view const rURI)
+{
+    // note: in the old implementation, the rURI would be URI-encoded again
+    // here, apparently because it could actually be an IRI (RFC 3987) and
+    // neon didn't support that - not clear if this is a good idea
+
+    m_pUrl.reset(curl_url());
+    if (!m_pUrl)
+    {
+        throw ::std::bad_alloc();
+    }
+
+    // use curl to parse the URI, to get a consistent interpretation
+    OString const utf8URI(OUStringToOString(rURI, RTL_TEXTENCODING_UTF8));
+    auto uc = curl_url_set(m_pUrl.get(), CURLUPART_URL, utf8URI.getStr(), 0);
+    if (uc != CURLUE_OK)
+    {
+        SAL_WARN("ucb.ucp.webdav.curl", "curl_url_set failed: " << uc);
+        throw DAVException(DAVException::DAV_INVALID_ARG);
+    }
+
+    Init();
+}
+
+CurlUri::CurlUri(CURLU /*const*/& rUrl)
+    : m_pUrl(curl_url_dup(&rUrl))
+{
+    if (!m_pUrl)
+    {
+        throw ::std::bad_alloc();
+    }
+
+    Init();
+}
+
+CurlUri::CurlUri(CurlUri const& rOther)
+    : m_pUrl(curl_url_dup(rOther.m_pUrl.get()))
+    , m_URI(rOther.m_URI)
+    , m_Scheme(rOther.m_Scheme)
+    , m_User(rOther.m_User)
+    , m_Password(rOther.m_Password)
+    , m_Host(rOther.m_Host)
+    , m_nPort(rOther.m_nPort)
+    , m_Path(rOther.m_Path)
+    , m_QueryAndFragment(rOther.m_QueryAndFragment)
+{
+    assert(rOther.m_pUrl);
+    if (!m_pUrl)
+    {
+        throw ::std::bad_alloc();
+    }
+}
+
+void CurlUri::operator=(CurlUri const& rOther)
+{
+    assert(rOther.m_pUrl);
+    m_pUrl.reset(curl_url_dup(rOther.m_pUrl.get()));
+    if (!m_pUrl)
+    {
+        throw ::std::bad_alloc();
+    }
+    m_URI = rOther.m_URI;
+    m_Scheme = rOther.m_Scheme;
+    m_User = rOther.m_User;
+    m_Password = rOther.m_Password;
+    m_Host = rOther.m_Host;
+    m_nPort = rOther.m_nPort;
+    m_Path = rOther.m_Path;
+    m_QueryAndFragment = rOther.m_QueryAndFragment;
+}
+
+bool CurlUri::operator==(CurlUri const& rOther) const { return m_URI == rOther.m_URI; }
+
+OUString CurlUri::GetPathBaseName() const
+{
+    sal_Int32 nPos = m_Path.lastIndexOf('/');
+    sal_Int32 nTrail = 0;
+    if (nPos == m_Path.getLength() - 1)
+    {
+        // Trailing slash found. Skip.
+        nTrail = 1;
+        nPos = m_Path.lastIndexOf('/', nPos);
+    }
+    if (nPos == -1)
+    {
+        return "/";
+    }
+    return m_Path.copy(nPos + 1, m_Path.getLength() - nPos - 1 - nTrail);
+}
+
+OUString CurlUri::GetPathBaseNameUnescaped() const { return DecodeURI(GetPathBaseName()); }
+
+void CurlUri::SetScheme(::std::u16string_view const rScheme)
+{
+    OString const utf8URI(OUStringToOString(rScheme, RTL_TEXTENCODING_UTF8));
+    auto uc = curl_url_set(m_pUrl.get(), CURLUPART_SCHEME, utf8URI.getStr(), 0);
+    if (uc != CURLUE_OK)
+    {
+        SAL_WARN("ucb.ucp.webdav.curl", "curl_url_set failed: " << uc);
+        throw DAVException(DAVException::DAV_INVALID_ARG);
+    }
+    auto const oURI(GetURLComponent(*m_pUrl, CURLUPART_URL, CURLUE_OK, CURLU_NO_DEFAULT_PORT));
+    assert(oURI);
+    m_URI = *oURI;
+    auto const oScheme(GetURLComponent(*m_pUrl, CURLUPART_SCHEME, CURLUE_NO_SCHEME));
+    if (oScheme)
+    {
+        m_Scheme = *oScheme;
+    }
+}
+
+void CurlUri::AppendPath(::std::u16string_view const rPath)
+{
+    OUStringBuffer path(m_Path);
+    if (path.lastIndexOf('/') != path.getLength() - 1)
+    {
+        path.append("/");
+    }
+    path.append(rPath);
+    OString const utf8Path(OUStringToOString(path.makeStringAndClear(), RTL_TEXTENCODING_UTF8));
+    auto uc = curl_url_set(m_pUrl.get(), CURLUPART_PATH, utf8Path.getStr(), 0);
+    if (uc != CURLUE_OK)
+    {
+        SAL_WARN("ucb.ucp.webdav.curl", "curl_url_set failed: " << uc);
+        throw DAVException(DAVException::DAV_INVALID_ARG);
+    }
+    auto const oURI(GetURLComponent(*m_pUrl, CURLUPART_URL, CURLUE_OK, CURLU_NO_DEFAULT_PORT));
+    assert(oURI);
+    m_URI = *oURI;
+    auto const oPath(GetURLComponent(*m_pUrl, CURLUPART_PATH, CURLUE_OK));
+    assert(oPath);
+    m_Path = *oPath;
+}
+
+CurlUri CurlUri::CloneWithRelativeRefPathAbsolute(OUString const& rRelativeRef) const
+{
+    ::std::unique_ptr<CURLU, deleter_from_fn<CURLU, curl_url_cleanup>> pUrl(
+        curl_url_dup(m_pUrl.get()));
+    sal_Int32 indexEnd(rRelativeRef.getLength());
+    auto const indexQuery(rRelativeRef.indexOf('?'));
+    auto const indexFragment(rRelativeRef.indexOf('#'));
+    CURLUcode uc;
+    if (indexFragment != -1)
+    {
+        std::u16string_view const fragment(rRelativeRef.subView(indexFragment + 1));
+        indexEnd = indexFragment;
+        OString const utf8Fragment(OUStringToOString(fragment, RTL_TEXTENCODING_UTF8));
+        uc = curl_url_set(pUrl.get(), CURLUPART_FRAGMENT, utf8Fragment.getStr(), 0);
+    }
+    else
+    {
+        uc = curl_url_set(pUrl.get(), CURLUPART_FRAGMENT, nullptr, 0);
+    }
+    if (uc != CURLUE_OK)
+    {
+        SAL_WARN("ucb.ucp.webdav.curl", "curl_url_set failed: " << uc);
+        throw DAVException(DAVException::DAV_INVALID_ARG);
+    }
+    if (indexQuery != -1 && (indexFragment == -1 || indexQuery < indexFragment))
+    {
+        std::u16string_view const query(
+            rRelativeRef.subView(indexQuery + 1, indexEnd - indexQuery - 1));
+        indexEnd = indexQuery;
+        OString const utf8Query(OUStringToOString(query, RTL_TEXTENCODING_UTF8));
+        uc = curl_url_set(pUrl.get(), CURLUPART_QUERY, utf8Query.getStr(), 0);
+    }
+    else
+    {
+        uc = curl_url_set(pUrl.get(), CURLUPART_QUERY, nullptr, 0);
+    }
+    if (uc != CURLUE_OK)
+    {
+        SAL_WARN("ucb.ucp.webdav.curl", "curl_url_set failed: " << uc);
+        throw DAVException(DAVException::DAV_INVALID_ARG);
+    }
+    std::u16string_view const path(rRelativeRef.subView(0, indexEnd));
+    OString const utf8Path(OUStringToOString(path, RTL_TEXTENCODING_UTF8));
+    uc = curl_url_set(pUrl.get(), CURLUPART_PATH, utf8Path.getStr(), 0);
+    if (uc != CURLUE_OK)
+    {
+        SAL_WARN("ucb.ucp.webdav.curl", "curl_url_set failed: " << uc);
+        throw DAVException(DAVException::DAV_INVALID_ARG);
+    }
+    return CurlUri(*pUrl.release());
+}
+
+OUString EncodeSegment(OUString const& rSegment)
+{
+    return rtl::Uri::encode(rSegment, rtl_UriCharClassPchar, rtl_UriEncodeIgnoreEscapes,
+                            RTL_TEXTENCODING_UTF8);
+}
+
+OUString DecodeURI(OUString const& rURI)
+{
+    return rtl::Uri::decode(rURI, rtl_UriDecodeWithCharset, RTL_TEXTENCODING_UTF8);
+}
+
+OUString ConnectionEndPointString(std::u16string_view rHostName, sal_uInt16 const nPort)
+{
+    OUStringBuffer aBuf;
+
+    // Is host a numeric IPv6 address?
+    if ((rHostName.find(':') != std::u16string_view::npos) && (rHostName[0] != '['))
+    {
+        aBuf.append("[");
+        aBuf.append(rHostName);
+        aBuf.append("]");
+    }
+    else
+    {
+        aBuf.append(rHostName);
+    }
+
+    if ((nPort != DEFAULT_HTTP_PORT) && (nPort != DEFAULT_HTTPS_PORT))
+    {
+        aBuf.append(":");
+        aBuf.append(sal_Int32(nPort));
+    }
+    return aBuf.makeStringAndClear();
+}
+
+} // namespace http_dav_ucp
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
diff --git a/ucb/source/ucp/webdav-curl/CurlUri.hxx b/ucb/source/ucp/webdav-curl/CurlUri.hxx
new file mode 100644
index 000000000..56336af78
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/CurlUri.hxx
@@ -0,0 +1,94 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <curl/curl.h>
+
+#include <memory>
+
+#include <rtl/ustring.hxx>
+
+#include "DAVException.hxx"
+
+namespace http_dav_ucp
+{
+template <typename T, auto fn> struct deleter_from_fn
+{
+    void operator()(T* p) const { fn(p); }
+};
+template <typename T> using CurlUniquePtr = ::std::unique_ptr<T, deleter_from_fn<T, curl_free>>;
+
+class CurlUri
+{
+private:
+    /// native curl representation of parsed URI
+    ::std::unique_ptr<CURLU, deleter_from_fn<CURLU, curl_url_cleanup>> m_pUrl;
+    /// duplicate state for quick access to some components
+    OUString m_URI;
+    OUString m_Scheme;
+    OUString m_User;
+    OUString m_Password;
+    OUString m_Host;
+    sal_uInt16 m_nPort = 0;
+    OUString m_Path;
+    OUString m_QueryAndFragment;
+
+    void Init();
+
+public:
+    CurlUri(CurlUri const& rUri);
+    CurlUri(CURLU /*const*/& rUrl);
+    void operator=(CurlUri const& rOther);
+
+    /// @throws DAVException
+    explicit CurlUri(::std::u16string_view rURI);
+
+    bool operator==(CurlUri const& rOther) const;
+
+    CURLU const* GetCURLU() const { return m_pUrl.get(); }
+    OUString const& GetURI() const { return m_URI; }
+    OUString const& GetScheme() const { return m_Scheme; }
+    OUString const& GetUser() const { return m_User; }
+    OUString const& GetPassword() const { return m_Password; }
+    OUString const& GetHost() const { return m_Host; }
+    sal_uInt16 GetPort() const { return m_nPort; }
+    OUString const& GetPath() const { return m_Path; }
+    OUString GetRelativeReference() const { return m_Path + m_QueryAndFragment; }
+
+    OUString GetPathBaseName() const;
+
+    OUString GetPathBaseNameUnescaped() const;
+
+    /// @throws DAVException
+    void SetScheme(::std::u16string_view rScheme);
+    /// @throws DAVException
+    void AppendPath(::std::u16string_view rPath);
+    /// @param matches: relative-ref = path-absolute [ "?" query ] [ "#" fragment ]
+    /// @throws DAVException
+    CurlUri CloneWithRelativeRefPathAbsolute(OUString const& rRelativeRef) const;
+};
+
+OUString EncodeSegment(OUString const& rSegment);
+OUString DecodeURI(OUString const& rURI);
+OUString ConnectionEndPointString(std::u16string_view rHost, sal_uInt16 nPort);
+
+} // namespace http_dav_ucp
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
diff --git a/ucb/source/ucp/webdav-curl/DAVAuthListener.hxx b/ucb/source/ucp/webdav-curl/DAVAuthListener.hxx
new file mode 100644
index 000000000..c3d643bc7
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/DAVAuthListener.hxx
@@ -0,0 +1,43 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#pragma once
+
+#include <salhelper/simplereferenceobject.hxx>
+#include <rtl/ustring.hxx>
+
+namespace http_dav_ucp
+{
+
+class DAVAuthListener : public salhelper::SimpleReferenceObject
+{
+    public:
+        virtual int authenticate(
+            const OUString & inRealm,
+            const OUString & inHostName,
+            OUString & inoutUserName,
+            OUString & outPassWord,
+            bool bCanUseSystemCredentials,
+            bool bUsePreviousCredentials = true ) = 0;
+};
+
+} // namespace http_dav_ucp
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/DAVAuthListenerImpl.hxx b/ucb/source/ucp/webdav-curl/DAVAuthListenerImpl.hxx
new file mode 100644
index 000000000..219a64906
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/DAVAuthListenerImpl.hxx
@@ -0,0 +1,61 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#pragma once
+
+#include "DAVAuthListener.hxx"
+#include <com/sun/star/ucb/XCommandEnvironment.hpp>
+
+
+namespace http_dav_ucp
+{
+
+
+
+
+    class DAVAuthListener_Impl : public DAVAuthListener
+    {
+    public:
+
+        DAVAuthListener_Impl(
+            const css::uno::Reference<css::ucb::XCommandEnvironment>& xEnv,
+            const OUString & inURL )
+            : m_xEnv( xEnv ), m_aURL( inURL )
+        {
+        }
+
+        virtual int authenticate( const OUString & inRealm,
+                                  const OUString & inHostName,
+                                  OUString & inoutUserName,
+                                  OUString & outPassWord,
+                                  bool bCanUseSystemCredentials,
+                                  bool bUsePreviousCredentials = true ) override;
+    private:
+
+        const css::uno::Reference< css::ucb::XCommandEnvironment > m_xEnv;
+        const OUString m_aURL;
+
+        OUString m_aPrevPassword;
+        OUString m_aPrevUsername;
+    };
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/DAVException.hxx b/ucb/source/ucp/webdav-curl/DAVException.hxx
new file mode 100644
index 000000000..24f8349d3
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/DAVException.hxx
@@ -0,0 +1,175 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#pragma once
+
+#include <rtl/ustring.hxx>
+
+namespace http_dav_ucp
+{
+
+
+// HTTP/WebDAV status codes
+
+
+const sal_uInt16 SC_NONE                             = 0;
+
+// 1xx (Informational - no errors)
+const sal_uInt16 SC_CONTINUE                         = 100;
+const sal_uInt16 SC_SWITCHING_PROTOCOLS              = 101;
+// DAV extensions
+const sal_uInt16 SC_PROCESSING                       = 102;
+
+//2xx (Successful - no errors)
+const sal_uInt16 SC_OK                               = 200;
+const sal_uInt16 SC_CREATED                          = 201;
+const sal_uInt16 SC_ACCEPTED                         = 202;
+const sal_uInt16 SC_NON_AUTHORITATIVE_INFORMATION    = 203;
+const sal_uInt16 SC_NO_CONTENT                       = 204;
+const sal_uInt16 SC_RESET_CONTENT                    = 205;
+const sal_uInt16 SC_PARTIAL_CONTENT                  = 206;
+// DAV extensions
+const sal_uInt16 SC_MULTISTATUS                      = 207;
+
+//3xx (Redirection)
+const sal_uInt16 SC_MULTIPLE_CHOICES                 = 300;
+const sal_uInt16 SC_MOVED_PERMANENTLY                = 301;
+const sal_uInt16 SC_MOVED_TEMPORARILY                = 302;
+const sal_uInt16 SC_SEE_OTHER                        = 303;
+const sal_uInt16 SC_NOT_MODIFIED                     = 304;
+const sal_uInt16 SC_USE_PROXY                        = 305;
+const sal_uInt16 SC_TEMPORARY_REDIRECT               = 307;
+
+//4xx (Client error)
+const sal_uInt16 SC_BAD_REQUEST                      = 400;
+const sal_uInt16 SC_UNAUTHORIZED                     = 401;
+const sal_uInt16 SC_PAYMENT_REQUIRED                 = 402;
+const sal_uInt16 SC_FORBIDDEN                        = 403;
+const sal_uInt16 SC_NOT_FOUND                        = 404;
+const sal_uInt16 SC_METHOD_NOT_ALLOWED               = 405;
+const sal_uInt16 SC_NOT_ACCEPTABLE                   = 406;
+const sal_uInt16 SC_PROXY_AUTHENTICATION_REQUIRED    = 407;
+const sal_uInt16 SC_REQUEST_TIMEOUT                  = 408;
+const sal_uInt16 SC_CONFLICT                         = 409;
+const sal_uInt16 SC_GONE                             = 410;
+const sal_uInt16 SC_LENGTH_REQUIRED                  = 411;
+const sal_uInt16 SC_PRECONDITION_FAILED              = 412;
+const sal_uInt16 SC_REQUEST_ENTITY_TOO_LARGE         = 413;
+const sal_uInt16 SC_REQUEST_URI_TOO_LONG             = 414;
+const sal_uInt16 SC_UNSUPPORTED_MEDIA_TYPE           = 415;
+const sal_uInt16 SC_REQUESTED_RANGE_NOT_SATISFIABLE  = 416;
+const sal_uInt16 SC_EXPECTATION_FAILED               = 417;
+// DAV extensions
+const sal_uInt16 SC_UNPROCESSABLE_ENTITY             = 422;
+const sal_uInt16 SC_LOCKED                           = 423;
+const sal_uInt16 SC_FAILED_DEPENDENCY                = 424;
+
+//5xx (Server error, general <https://tools.ietf.org/html/rfc7231#section-6.6>)
+const sal_uInt16 SC_INTERNAL_SERVER_ERROR            = 500;
+const sal_uInt16 SC_NOT_IMPLEMENTED                  = 501;
+const sal_uInt16 SC_BAD_GATEWAY                      = 502;
+const sal_uInt16 SC_SERVICE_UNAVAILABLE              = 503;
+const sal_uInt16 SC_GATEWAY_TIMEOUT                  = 504;
+const sal_uInt16 SC_HTTP_VERSION_NOT_SUPPORTED       = 505;
+// DAV extensions (<https://tools.ietf.org/html/rfc4918#section-11>)
+const sal_uInt16 SC_INSUFFICIENT_STORAGE             = 507;
+
+// unofficial status codes only used internally by LO
+// used to cache the connection time out event
+const sal_uInt16 USC_CONNECTION_TIMED_OUT            = 908;
+    // name resolution failed
+const sal_uInt16 USC_LOOKUP_FAILED                   = 909;
+const sal_uInt16 USC_AUTH_FAILED                     = 910;
+const sal_uInt16 USC_AUTHPROXY_FAILED                = 911;
+
+
+
+class DAVException : public std::exception
+{
+    public:
+        enum ExceptionCode {
+            DAV_HTTP_ERROR = 0, // Generic error,
+                                // mData = server error message,
+                                // mStatusCode = HTTP status code
+            DAV_HTTP_LOOKUP,    // Name lookup failed,
+                                // mData = server[:port]
+            DAV_HTTP_NOAUTH,    // No User authentication data provided - e.g., user aborts corresponding dialog
+                                // mData = server[:port]
+            DAV_HTTP_AUTH,      // User authentication failed on server,
+                                // mData = server[:port]
+            DAV_HTTP_AUTHPROXY, // User authentication failed on proxy,
+                                // mData = proxy server[:port]
+            DAV_HTTP_CONNECT,   // Could not connect to server,
+                                // mData = server[:port]
+            DAV_HTTP_TIMEOUT,   // Connection timed out
+                                // mData = server[:port]
+            DAV_HTTP_FAILED,    // The precondition failed
+                                // mData = server[:port]
+            DAV_HTTP_RETRY,     // Retry request
+                                // mData = server[:port]
+            DAV_HTTP_REDIRECT,  // Request was redirected,
+                                // mData = new URL
+            DAV_SESSION_CREATE, // session creation error,
+                                // mData = server[:port]
+            DAV_INVALID_ARG,    // invalid argument
+            DAV_UNSUPPORTED,    // internal to CurlSession
+
+            DAV_LOCK_EXPIRED,   // DAV lock expired
+
+            DAV_NOT_LOCKED,     // not locked
+
+            DAV_LOCKED_SELF,    // locked by this OOo session
+
+            DAV_LOCKED          // locked by third party
+        };
+
+    private:
+        ExceptionCode   mExceptionCode;
+        OUString   mData;
+        sal_uInt16      mStatusCode;
+
+    public:
+         explicit DAVException( ExceptionCode inExceptionCode )
+             : mExceptionCode( inExceptionCode )
+             , mData()
+             , mStatusCode( SC_NONE )
+         {};
+         DAVException( ExceptionCode inExceptionCode,
+                       const OUString & rData )
+             : mExceptionCode( inExceptionCode )
+             , mData( rData )
+             , mStatusCode( SC_NONE )
+         {};
+         DAVException( ExceptionCode inExceptionCode,
+                       const OUString & rData,
+                       sal_uInt16 nStatusCode )
+            : mExceptionCode( inExceptionCode )
+            , mData( rData )
+            , mStatusCode( nStatusCode )
+         {};
+
+    const ExceptionCode & getError() const { return mExceptionCode; }
+    const OUString & getData() const  { return mData; }
+    sal_uInt16 getStatus() const { return mStatusCode; }
+};
+
+} // namespace http_dav_ucp
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/DAVProperties.cxx b/ucb/source/ucp/webdav-curl/DAVProperties.cxx
new file mode 100644
index 000000000..8b3dce369
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/DAVProperties.cxx
@@ -0,0 +1,202 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include "DAVProperties.hxx"
+#include <rtl/ustrbuf.hxx>
+#include <o3tl/string_view.hxx>
+#include <string.h>
+
+using namespace http_dav_ucp;
+
+
+// static
+void DAVProperties::createSerfPropName( ::std::u16string_view const rFullName,
+                                        SerfPropName & rName )
+{
+    if (o3tl::starts_with(rFullName, u"DAV:"))
+    {
+        rName.nspace = "DAV:";
+        rName.name
+            = strdup( OUStringToOString(
+                        rFullName.substr(RTL_CONSTASCII_LENGTH("DAV:")),
+                                        RTL_TEXTENCODING_UTF8 ).getStr() );
+    }
+    else if (o3tl::starts_with(rFullName, u"http://apache.org/dav/props/"))
+    {
+        rName.nspace = "http://apache.org/dav/props/";
+        rName.name
+            = strdup( OUStringToOString(
+                        rFullName.substr(
+                            RTL_CONSTASCII_LENGTH(
+                                "http://apache.org/dav/props/" ) ),
+                            RTL_TEXTENCODING_UTF8 ).getStr() );
+    }
+    else if (o3tl::starts_with(rFullName, u"http://ucb.openoffice.org/dav/props/"))
+    {
+        rName.nspace = "http://ucb.openoffice.org/dav/props/";
+        rName.name
+            = strdup( OUStringToOString(
+                        rFullName.substr(
+                            RTL_CONSTASCII_LENGTH(
+                                "http://ucb.openoffice.org/dav/props/" ) ),
+                            RTL_TEXTENCODING_UTF8 ).getStr() );
+    }
+    else if (o3tl::starts_with(rFullName, u"<prop:"))
+    {
+        // Support for 3rd party namespaces/props
+
+        OString aFullName
+            = OUStringToOString( rFullName, RTL_TEXTENCODING_UTF8 );
+
+        // Format: <prop:the_propname xmlns:prop="the_namespace">
+
+        sal_Int32 nStart = RTL_CONSTASCII_LENGTH( "<prop:" );
+        sal_Int32 nLen = aFullName.indexOf( ' ' ) - nStart;
+        rName.name = strdup( aFullName.copy( nStart, nLen ).getStr() );
+
+        nStart = aFullName.indexOf( '=', nStart + nLen ) + 2; // after ="
+        nLen = aFullName.getLength() - RTL_CONSTASCII_LENGTH( "\">" ) - nStart;
+        rName.nspace = strdup( aFullName.copy( nStart, nLen ).getStr() );
+    }
+    else
+    {
+        // this must not be a URI - WebDAVResponseParser must have converted it
+        // to the "<prop:" form above
+        assert(rFullName.find(':') == ::std::u16string_view::npos);
+        // Add our namespace to our own properties.
+        rName.nspace = "http://ucb.openoffice.org/dav/props/";
+        rName.name
+            = strdup( OUStringToOString( rFullName,
+                                              RTL_TEXTENCODING_UTF8 ).getStr() );
+    }
+}
+
+
+// static
+void DAVProperties::createUCBPropName( const char * nspace,
+                                       const char * name,
+                                       OUString & rFullName )
+{
+    OUString aNameSpace
+        = OStringToOUString( nspace, RTL_TEXTENCODING_UTF8 );
+    OUString aName
+        = OStringToOUString( name,   RTL_TEXTENCODING_UTF8 );
+
+    if ( !aNameSpace.getLength() )
+    {
+        // Some servers send XML without proper namespaces. Assume "DAV:"
+        // in this case, if name is a well-known dav property name.
+        // Although this is not 100% correct, it solves many problems.
+
+        if (o3tl::equalsIgnoreAsciiCase(aName, std::u16string_view(DAVProperties::RESOURCETYPE).substr(4)) ||
+            o3tl::equalsIgnoreAsciiCase(aName, std::u16string_view(DAVProperties::SUPPORTEDLOCK).substr(4)) ||
+            o3tl::equalsIgnoreAsciiCase(aName, std::u16string_view(DAVProperties::LOCKDISCOVERY).substr(4)) ||
+            o3tl::equalsIgnoreAsciiCase(aName, std::u16string_view(DAVProperties::CREATIONDATE).substr(4)) ||
+            o3tl::equalsIgnoreAsciiCase(aName, std::u16string_view(DAVProperties::DISPLAYNAME).substr(4)) ||
+            o3tl::equalsIgnoreAsciiCase(aName, std::u16string_view(DAVProperties::GETCONTENTLANGUAGE).substr(4)) ||
+            o3tl::equalsIgnoreAsciiCase(aName, std::u16string_view(DAVProperties::GETCONTENTLENGTH).substr(4)) ||
+            o3tl::equalsIgnoreAsciiCase(aName, std::u16string_view(DAVProperties::GETCONTENTTYPE).substr(4)) ||
+            o3tl::equalsIgnoreAsciiCase(aName, std::u16string_view(DAVProperties::GETETAG).substr(4)) ||
+            o3tl::equalsIgnoreAsciiCase(aName, std::u16string_view(DAVProperties::GETLASTMODIFIED).substr(4)))
+        {
+            aNameSpace = "DAV:";
+        }
+    }
+
+    // Note: Concatenating strings BEFORE comparing against known namespaces
+    //       is important. See RFC 2815 ( 23.4.2 Meaning of Qualified Names ).
+    rFullName  = aNameSpace;
+    rFullName += aName;
+
+    if ( rFullName.startsWith( "DAV:" ) )
+    {
+        // Okay, Just concat strings.
+    }
+    else if ( rFullName.startsWith( "http://apache.org/dav/props/" ) )
+    {
+        // Okay, Just concat strings.
+    }
+    else if ( rFullName.startsWith( "http://ucb.openoffice.org/dav/props/" ) )
+    {
+        // Remove namespace from our own properties.
+        rFullName = rFullName.copy(
+                        RTL_CONSTASCII_LENGTH(
+                            "http://ucb.openoffice.org/dav/props/" ) );
+    }
+    else
+    {
+        // Create property name that encodes, namespace and name ( XML ).
+        rFullName  = "<prop:";
+        rFullName += aName;
+        rFullName += " xmlns:prop=\"";
+        rFullName += aNameSpace;
+        rFullName += "\">";
+    }
+}
+
+
+// static
+bool DAVProperties::isUCBDeadProperty( const SerfPropName & rName )
+{
+    return ( rName.nspace &&
+             ( rtl_str_compareIgnoreAsciiCase(
+                 rName.nspace, "http://ucb.openoffice.org/dav/props/" )
+               == 0 ) );
+}
+
+bool DAVProperties::isUCBSpecialProperty(const OUString& rFullName, OUString& rParsedName)
+{
+    sal_Int32 nLen = rFullName.getLength();
+    if ( nLen <= 0 ||
+            !rFullName.startsWith( "<prop:" ) ||
+            !rFullName.endsWith( "\">" ) )
+        return false;
+
+    sal_Int32 nStart = RTL_CONSTASCII_LENGTH( "<prop:" );
+    sal_Int32 nEnd = rFullName.indexOf( ' ', nStart );
+    if ( nEnd == -1 )
+        return false;
+
+    OUString sPropName = rFullName.copy( nStart, nEnd - nStart );
+    if ( !sPropName.getLength() )
+        return false;
+
+    // TODO skip whitespaces?
+    if ( !rFullName.match( "xmlns:prop=\"", ++nEnd ) )
+        return false;
+
+    nStart = nEnd + RTL_CONSTASCII_LENGTH( "xmlns:prop=\"" );
+    nEnd = rFullName.indexOf( '"', nStart );
+    if ( nEnd != nLen - RTL_CONSTASCII_LENGTH( "\">" ) )
+        return false;
+
+    OUString sNamesp = rFullName.copy( nStart, nEnd - nStart );
+    if ( !( nLen = sNamesp.getLength() ) )
+        return false;
+
+    OUStringBuffer aBuff( sNamesp );
+    if ( sNamesp[nLen - 1] != '/' )
+        aBuff.append( '/' );
+    aBuff.append( sPropName );
+    rParsedName = aBuff.makeStringAndClear();
+
+    return rParsedName.getLength();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/DAVProperties.hxx b/ucb/source/ucp/webdav-curl/DAVProperties.hxx
new file mode 100644
index 000000000..af005300c
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/DAVProperties.hxx
@@ -0,0 +1,57 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#pragma once
+
+#include <rtl/ustring.hxx>
+
+namespace http_dav_ucp
+{
+
+typedef struct { const char *nspace, *name; } SerfPropName;
+
+struct DAVProperties
+{
+    static constexpr OUStringLiteral CREATIONDATE = u"DAV:creationdate";
+    static constexpr OUStringLiteral DISPLAYNAME = u"DAV:displayname";
+    static constexpr OUStringLiteral GETCONTENTLANGUAGE = u"DAV:getcontentlanguage";
+    static constexpr OUStringLiteral GETCONTENTLENGTH = u"DAV:getcontentlength";
+    static constexpr OUStringLiteral GETCONTENTTYPE = u"DAV:getcontenttype";
+    static constexpr OUStringLiteral GETETAG = u"DAV:getetag";
+    static constexpr OUStringLiteral GETLASTMODIFIED = u"DAV:getlastmodified";
+    static constexpr OUStringLiteral LOCKDISCOVERY = u"DAV:lockdiscovery";
+    static constexpr OUStringLiteral RESOURCETYPE = u"DAV:resourcetype";
+    static constexpr OUStringLiteral SUPPORTEDLOCK = u"DAV:supportedlock";
+    static constexpr OUStringLiteral EXECUTABLE = u"http://apache.org/dav/props/executable";
+
+    static void createSerfPropName( ::std::u16string_view rFullName,
+                                    SerfPropName & rName );
+    static void createUCBPropName ( const char * nspace,
+                                    const char * name,
+                                    OUString & rFullName );
+
+    static bool isUCBDeadProperty( const SerfPropName & rName );
+    static bool isUCBSpecialProperty( const OUString & rFullName,
+                                      OUString & rParsedName );
+};
+
+} // namespace http_dav_ucp
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/DAVRequestEnvironment.hxx b/ucb/source/ucp/webdav-curl/DAVRequestEnvironment.hxx
new file mode 100644
index 000000000..88cdebde5
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/DAVRequestEnvironment.hxx
@@ -0,0 +1,45 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#pragma once
+
+#include <vector>
+#include <rtl/ref.hxx>
+#include "DAVAuthListener.hxx"
+
+namespace http_dav_ucp
+{
+    typedef std::pair< OUString, OUString > DAVRequestHeader;
+    typedef std::vector< DAVRequestHeader > DAVRequestHeaders;
+
+struct DAVRequestEnvironment
+{
+    rtl::Reference< DAVAuthListener >     m_xAuthListener;
+    DAVRequestHeaders                     m_aRequestHeaders;
+
+    DAVRequestEnvironment( const rtl::Reference< DAVAuthListener > & xListener,
+                       const DAVRequestHeaders & rRequestHeaders)
+    : m_xAuthListener( xListener ),
+      m_aRequestHeaders( rRequestHeaders ) {}
+};
+
+} // namespace http_dav_ucp
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/DAVResource.hxx b/ucb/source/ucp/webdav-curl/DAVResource.hxx
new file mode 100644
index 000000000..93cdd743f
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/DAVResource.hxx
@@ -0,0 +1,58 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#pragma once
+
+#include <vector>
+
+#include <rtl/ustring.hxx>
+#include <com/sun/star/uno/Any.hxx>
+
+namespace http_dav_ucp
+{
+
+struct DAVPropertyValue
+{
+    OUString            Name;
+    css::uno::Any       Value;
+    bool                IsCaseSensitive;
+
+    DAVPropertyValue() : IsCaseSensitive( true ) {}
+};
+
+struct DAVResource
+{
+    OUString uri;
+    std::vector< DAVPropertyValue > properties;
+};
+
+struct DAVResourceInfo
+{
+    std::vector < OUString > properties;
+
+    bool operator==( const struct DAVResourceInfo& a ) const
+    {
+        return (properties == a.properties );
+    }
+};
+
+} // namespace http_dav_ucp
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/DAVResourceAccess.cxx b/ucb/source/ucp/webdav-curl/DAVResourceAccess.cxx
new file mode 100644
index 000000000..0119495e3
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/DAVResourceAccess.cxx
@@ -0,0 +1,1171 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include <com/sun/star/task/XInteractionAbort.hpp>
+#include <com/sun/star/ucb/XWebDAVCommandEnvironment.hpp>
+
+#include <ucbhelper/simpleauthenticationrequest.hxx>
+#include <comphelper/seekableinput.hxx>
+
+#include "DAVAuthListenerImpl.hxx"
+#include "DAVResourceAccess.hxx"
+
+#include <com/sun/star/lang/IllegalArgumentException.hpp>
+#include <com/sun/star/io/IOException.hpp>
+
+using namespace http_dav_ucp;
+using namespace com::sun::star;
+
+
+// DAVAuthListener_Impl Implementation.
+
+
+// virtual
+int DAVAuthListener_Impl::authenticate(
+    const OUString & inRealm,
+    const OUString & inHostName,
+    OUString & inoutUserName,
+    OUString & outPassWord,
+    bool bCanUseSystemCredentials,
+    bool bUsePreviousCredentials )
+{
+    if ( m_xEnv.is() )
+    {
+        uno::Reference< task::XInteractionHandler > xIH
+            = m_xEnv->getInteractionHandler();
+
+        if ( xIH.is() )
+        {
+            // Providing previously retrieved credentials will cause the password
+            // container to reject these. Thus, the credential input dialog will be shown again.
+            // #102871# - Supply username and password from previous try.
+            // Password container service depends on this!
+            if ( inoutUserName.isEmpty() && bUsePreviousCredentials )
+                inoutUserName = m_aPrevUsername;
+
+            if ( outPassWord.isEmpty() && bUsePreviousCredentials )
+                outPassWord = m_aPrevPassword;
+
+            rtl::Reference< ucbhelper::SimpleAuthenticationRequest > xRequest
+                = new ucbhelper::SimpleAuthenticationRequest(
+                    m_aURL, inHostName, inRealm, inoutUserName,
+                    outPassWord,
+                    bCanUseSystemCredentials );
+            xIH->handle( xRequest );
+
+            rtl::Reference< ucbhelper::InteractionContinuation > xSelection
+                = xRequest->getSelection();
+
+            if ( xSelection.is() )
+            {
+                // Handler handled the request.
+                uno::Reference< task::XInteractionAbort > xAbort(
+                    xSelection.get(), uno::UNO_QUERY );
+                if ( !xAbort.is() )
+                {
+                    const rtl::Reference<
+                        ucbhelper::InteractionSupplyAuthentication > & xSupp
+                        = xRequest->getAuthenticationSupplier();
+
+                    bool bUseSystemCredentials = false;
+
+                    if ( bCanUseSystemCredentials )
+                        bUseSystemCredentials
+                            = xSupp->getUseSystemCredentials();
+
+                    if ( bUseSystemCredentials )
+                    {
+                        // This is the (strange) way to tell neon to use
+                        // system credentials.
+                        inoutUserName.clear();
+                        outPassWord.clear();
+                    }
+                    else
+                    {
+                        inoutUserName = xSupp->getUserName();
+                        outPassWord   = xSupp->getPassword();
+                    }
+
+                    // #102871# - Remember username and password.
+                    m_aPrevUsername = inoutUserName;
+                    m_aPrevPassword = outPassWord;
+
+                    // go on.
+                    return 0;
+                }
+            }
+        }
+    }
+    // Abort.
+    return -1;
+}
+
+
+// DAVResourceAccess Implementation.
+
+
+DAVResourceAccess::DAVResourceAccess(
+    const uno::Reference< uno::XComponentContext > & rContext,
+    rtl::Reference< DAVSessionFactory > const & rSessionFactory,
+    const OUString & rURL )
+: m_aURL( rURL ),
+  m_xSessionFactory( rSessionFactory ),
+  m_xContext( rContext )
+, m_nRedirectLimit( 5 )
+{
+}
+
+
+DAVResourceAccess::DAVResourceAccess( const DAVResourceAccess & rOther )
+: m_aURL( rOther.m_aURL ),
+  m_aPath( rOther.m_aPath ),
+  m_aFlags( rOther.m_aFlags ),
+  m_xSession( rOther.m_xSession ),
+  m_xSessionFactory( rOther.m_xSessionFactory ),
+  m_xContext( rOther.m_xContext ),
+  m_aRedirectURIs( rOther.m_aRedirectURIs ),
+  m_nRedirectLimit( rOther.m_nRedirectLimit )
+{
+}
+
+
+DAVResourceAccess & DAVResourceAccess::operator=(
+    const DAVResourceAccess & rOther )
+{
+    m_aURL            = rOther.m_aURL;
+    m_aPath           = rOther.m_aPath;
+    m_aFlags          = rOther.m_aFlags;
+    m_xSession        = rOther.m_xSession;
+    m_xSessionFactory = rOther.m_xSessionFactory;
+    m_xContext           = rOther.m_xContext;
+    m_aRedirectURIs   = rOther.m_aRedirectURIs;
+    m_nRedirectLimit = rOther.m_nRedirectLimit;
+
+    return *this;
+}
+
+void DAVResourceAccess::OPTIONS(
+    DAVOptions & rOptions,
+    const uno::Reference< ucb::XCommandEnvironment > & xEnv )
+{
+    initialize();
+
+    int errorCount = 0;
+    bool bRetry;
+    do
+    {
+        bRetry = false;
+        try
+        {
+            DAVRequestHeaders aHeaders;
+
+            getUserRequestHeaders( xEnv,
+                                   getRequestURI(),
+                                   ucb::WebDAVHTTPMethod_OPTIONS,
+                                   aHeaders );
+
+            m_xSession->OPTIONS( getRequestURI(),
+                                  rOptions,
+                                  DAVRequestEnvironment(
+                                      new DAVAuthListener_Impl( xEnv, m_aURL ),
+                                      aHeaders ) );
+        }
+        catch (DAVException const& e)
+        {
+            errorCount++;
+            bRetry = handleException( e, errorCount );
+            if ( !bRetry )
+                throw;
+        }
+    }
+    while ( bRetry );
+}
+
+void DAVResourceAccess::PROPFIND(
+    const Depth nDepth,
+    const std::vector< OUString > & rPropertyNames,
+    std::vector< DAVResource > & rResources,
+    const uno::Reference< ucb::XCommandEnvironment > & xEnv )
+{
+    initialize();
+
+    int errorCount = 0;
+    bool bRetry;
+    do
+    {
+        bRetry = false;
+        try
+        {
+            DAVRequestHeaders aHeaders;
+
+            getUserRequestHeaders( xEnv,
+                                   getRequestURI(),
+                                   ucb::WebDAVHTTPMethod_PROPFIND,
+                                   aHeaders );
+
+            m_xSession->PROPFIND( getRequestURI(),
+                                  nDepth,
+                                  rPropertyNames,
+                                  rResources,
+                                  DAVRequestEnvironment(
+                                      new DAVAuthListener_Impl( xEnv, m_aURL ),
+                                      aHeaders ) );
+        }
+        catch (DAVException const& e)
+        {
+            errorCount++;
+            bRetry = handleException( e, errorCount );
+            if ( !bRetry )
+                throw;
+        }
+    }
+    while ( bRetry );
+}
+
+
+void DAVResourceAccess::PROPFIND(
+    const Depth nDepth,
+    std::vector< DAVResourceInfo > & rResInfo,
+    const uno::Reference< ucb::XCommandEnvironment > & xEnv )
+{
+    initialize();
+
+    int errorCount = 0;
+    bool bRetry;
+    do
+    {
+        bRetry = false;
+        try
+        {
+            DAVRequestHeaders aHeaders;
+            getUserRequestHeaders( xEnv,
+                                   getRequestURI(),
+                                   ucb::WebDAVHTTPMethod_PROPFIND,
+                                   aHeaders );
+
+            m_xSession->PROPFIND( getRequestURI(),
+                                  nDepth,
+                                  rResInfo,
+                                  DAVRequestEnvironment(
+                                      new DAVAuthListener_Impl( xEnv, m_aURL ),
+                                      aHeaders ) ) ;
+        }
+        catch (DAVException const& e)
+        {
+            errorCount++;
+            bRetry = handleException( e, errorCount );
+            if ( !bRetry )
+                throw;
+        }
+    }
+    while ( bRetry );
+}
+
+
+void DAVResourceAccess::PROPPATCH(
+    const std::vector< ProppatchValue >& rValues,
+    const uno::Reference< ucb::XCommandEnvironment >& xEnv )
+{
+    initialize();
+
+    int errorCount = 0;
+    bool bRetry;
+    do
+    {
+        bRetry = false;
+        try
+        {
+            DAVRequestHeaders aHeaders;
+            getUserRequestHeaders( xEnv,
+                                   getRequestURI(),
+                                   ucb::WebDAVHTTPMethod_PROPPATCH,
+                                   aHeaders );
+
+            m_xSession->PROPPATCH( getRequestURI(),
+                                   rValues,
+                                   DAVRequestEnvironment(
+                                       new DAVAuthListener_Impl( xEnv, m_aURL ),
+                                       aHeaders ) );
+        }
+        catch (DAVException const& e)
+        {
+            errorCount++;
+            bRetry = handleException( e, errorCount );
+            if ( !bRetry )
+                throw;
+        }
+    }
+    while ( bRetry );
+}
+
+
+void DAVResourceAccess::HEAD(
+    const std::vector< OUString > & rHeaderNames,
+    DAVResource & rResource,
+    const uno::Reference< ucb::XCommandEnvironment >& xEnv )
+{
+    initialize();
+
+    int errorCount = 0;
+    bool bRetry;
+    do
+    {
+        bRetry = false;
+        try
+        {
+            DAVRequestHeaders aHeaders;
+            getUserRequestHeaders( xEnv,
+                                   getRequestURI(),
+                                   ucb::WebDAVHTTPMethod_HEAD,
+                                   aHeaders );
+
+            m_xSession->HEAD( getRequestURI(),
+                              rHeaderNames,
+                              rResource,
+                              DAVRequestEnvironment(
+                                  new DAVAuthListener_Impl( xEnv, m_aURL ),
+                                  aHeaders ) );
+        }
+        catch (DAVException const& e)
+        {
+            errorCount++;
+            bRetry = handleException( e, errorCount );
+            if ( !bRetry )
+                throw;
+        }
+    }
+    while ( bRetry );
+}
+
+
+uno::Reference< io::XInputStream > DAVResourceAccess::GET(
+    const uno::Reference< ucb::XCommandEnvironment > & xEnv )
+{
+    initialize();
+
+    uno::Reference< io::XInputStream > xStream;
+    int errorCount = 0;
+    bool bRetry;
+    do
+    {
+        bRetry = false;
+        try
+        {
+            DAVRequestHeaders aHeaders;
+            getUserRequestHeaders( xEnv,
+                                   getRequestURI(),
+                                   ucb::WebDAVHTTPMethod_GET,
+                                   aHeaders );
+
+            xStream = m_xSession->GET( getRequestURI(),
+                                       DAVRequestEnvironment(
+                                           new DAVAuthListener_Impl(
+                                               xEnv, m_aURL ),
+                                           aHeaders ) );
+        }
+        catch (DAVException const& e)
+        {
+            errorCount++;
+            bRetry = handleException( e, errorCount );
+            if ( !bRetry )
+                throw;
+        }
+    }
+    while ( bRetry );
+
+    return xStream;
+}
+
+
+void DAVResourceAccess::GET(
+    uno::Reference< io::XOutputStream > & rStream,
+    const uno::Reference< ucb::XCommandEnvironment > & xEnv )
+{
+    initialize();
+
+    int errorCount = 0;
+    bool bRetry;
+    do
+    {
+        bRetry = false;
+        try
+        {
+            DAVRequestHeaders aHeaders;
+            getUserRequestHeaders( xEnv,
+                                   getRequestURI(),
+                                   ucb::WebDAVHTTPMethod_GET,
+                                   aHeaders );
+
+            m_xSession->GET( getRequestURI(),
+                             rStream,
+                             DAVRequestEnvironment(
+                                 new DAVAuthListener_Impl( xEnv, m_aURL ),
+                                 aHeaders ) );
+        }
+        catch (DAVException const& e)
+        {
+            errorCount++;
+            bRetry = handleException( e, errorCount );
+            if ( !bRetry )
+                throw;
+        }
+    }
+    while ( bRetry );
+}
+
+
+uno::Reference< io::XInputStream > DAVResourceAccess::GET(
+    const std::vector< OUString > & rHeaderNames,
+    DAVResource & rResource,
+    const uno::Reference< ucb::XCommandEnvironment > & xEnv )
+{
+    initialize();
+
+    uno::Reference< io::XInputStream > xStream;
+    int errorCount = 0;
+    bool bRetry;
+    do
+    {
+        bRetry = false;
+        try
+        {
+            DAVRequestHeaders aHeaders;
+            getUserRequestHeaders( xEnv,
+                                   getRequestURI(),
+                                   ucb::WebDAVHTTPMethod_GET,
+                                   aHeaders );
+
+            xStream = m_xSession->GET( getRequestURI(),
+                                       rHeaderNames,
+                                       rResource,
+                                       DAVRequestEnvironment(
+                                           new DAVAuthListener_Impl(
+                                               xEnv, m_aURL ),
+                                           aHeaders ) );
+        }
+        catch (DAVException const& e)
+        {
+            errorCount++;
+            bRetry = handleException( e, errorCount );
+            if ( !bRetry )
+                throw;
+        }
+    }
+    while ( bRetry );
+
+    return xStream;
+}
+
+
+// used as HEAD substitute when HEAD is not implemented on server
+void DAVResourceAccess::GET0(
+    DAVRequestHeaders &rRequestHeaders,
+    const std::vector< OUString > & rHeaderNames,
+    DAVResource & rResource,
+    const uno::Reference< ucb::XCommandEnvironment > & xEnv )
+{
+    initialize();
+
+    int errorCount = 0;
+    bool bRetry;
+    do
+    {
+        bRetry = false;
+        try
+        {
+            getUserRequestHeaders( xEnv,
+                                   getRequestURI(),
+                                   ucb::WebDAVHTTPMethod_GET,
+                                   rRequestHeaders );
+
+            m_xSession->GET( getRequestURI(),
+                              rHeaderNames,
+                              rResource,
+                              DAVRequestEnvironment(
+                                  new DAVAuthListener_Impl(
+                                      xEnv, m_aURL ),
+                                  rRequestHeaders ) );
+        }
+        catch (DAVException const& e)
+        {
+            errorCount++;
+            bRetry = handleException( e, errorCount );
+            if ( !bRetry )
+                throw;
+        }
+    }
+    while ( bRetry );
+}
+
+
+void DAVResourceAccess::GET(
+    uno::Reference< io::XOutputStream > & rStream,
+    const std::vector< OUString > & rHeaderNames,
+    DAVResource & rResource,
+    const uno::Reference< ucb::XCommandEnvironment > & xEnv )
+{
+    initialize();
+
+    bool bRetry;
+    int errorCount = 0;
+    do
+    {
+        bRetry = false;
+        try
+        {
+            DAVRequestHeaders aHeaders;
+            getUserRequestHeaders( xEnv,
+                                   getRequestURI(),
+                                   ucb::WebDAVHTTPMethod_GET,
+                                   aHeaders );
+
+            m_xSession->GET( getRequestURI(),
+                             rStream,
+                             rHeaderNames,
+                             rResource,
+                             DAVRequestEnvironment(
+                                 new DAVAuthListener_Impl( xEnv, m_aURL ),
+                                 aHeaders ) );
+        }
+        catch (DAVException const& e)
+        {
+            errorCount++;
+            bRetry = handleException( e, errorCount );
+            if ( !bRetry )
+                throw;
+        }
+    }
+    while ( bRetry );
+}
+
+
+void DAVResourceAccess::abort()
+{
+    // seems pointless to call initialize() here, but prepare for nullptr
+    decltype(m_xSession) xSession;
+    {
+        osl::Guard<osl::Mutex> const g(m_aMutex);
+        xSession = m_xSession;
+    }
+    if (xSession.is())
+    {
+        xSession->abort();
+    }
+}
+
+
+namespace {
+
+    /// @throws DAVException
+    void resetInputStream( const uno::Reference< io::XInputStream > & rStream )
+    {
+        try
+        {
+            uno::Reference< io::XSeekable > xSeekable(
+                rStream, uno::UNO_QUERY );
+            if ( xSeekable.is() )
+            {
+                xSeekable->seek( 0 );
+                return;
+            }
+        }
+        catch ( lang::IllegalArgumentException const & )
+        {
+        }
+        catch ( io::IOException const & )
+        {
+        }
+
+        throw DAVException( DAVException::DAV_INVALID_ARG );
+    }
+
+} // namespace
+
+
+void DAVResourceAccess::PUT(
+    const uno::Reference< io::XInputStream > & rStream,
+    const uno::Reference< ucb::XCommandEnvironment > & xEnv )
+{
+    initialize();
+
+    // Make stream seekable, if it not. Needed, if request must be retried.
+    uno::Reference< io::XInputStream > xSeekableStream
+        = comphelper::OSeekableInputWrapper::CheckSeekableCanWrap(
+            rStream, m_xContext );
+
+    int errorCount = 0;
+    bool bRetry = false;
+    do
+    {
+        if ( bRetry )
+            resetInputStream( xSeekableStream );
+
+        bRetry = false;
+        try
+        {
+            DAVRequestHeaders aHeaders;
+            getUserRequestHeaders( xEnv,
+                                   getRequestURI(),
+                                   ucb::WebDAVHTTPMethod_PUT,
+                                   aHeaders );
+
+            m_xSession->PUT( getRequestURI(),
+                             xSeekableStream,
+                             DAVRequestEnvironment(
+                                 new DAVAuthListener_Impl( xEnv, m_aURL ),
+                                 aHeaders ) );
+        }
+        catch (DAVException const& e)
+        {
+            errorCount++;
+            bRetry = handleException( e, errorCount );
+            if ( !bRetry )
+                throw;
+        }
+    }
+    while ( bRetry );
+}
+
+
+uno::Reference< io::XInputStream > DAVResourceAccess::POST(
+    const OUString & rContentType,
+    const OUString & rReferer,
+    const uno::Reference< io::XInputStream > & rInputStream,
+    const uno::Reference< ucb::XCommandEnvironment >& xEnv )
+{
+    initialize();
+
+    // Make stream seekable, if it not. Needed, if request must be retried.
+    uno::Reference< io::XInputStream > xSeekableStream
+        = comphelper::OSeekableInputWrapper::CheckSeekableCanWrap(
+            rInputStream, m_xContext );
+
+    uno::Reference< io::XInputStream > xStream;
+    int errorCount = 0;
+    bool bRetry = false;
+    do
+    {
+        if ( bRetry )
+        {
+            resetInputStream( xSeekableStream );
+            bRetry = false;
+        }
+
+        try
+        {
+            DAVRequestHeaders aHeaders;
+            getUserRequestHeaders( xEnv,
+                                   getRequestURI(),
+                                   ucb::WebDAVHTTPMethod_POST,
+                                   aHeaders );
+
+            xStream = m_xSession->POST( getRequestURI(),
+                                        rContentType,
+                                        rReferer,
+                                        xSeekableStream,
+                                        DAVRequestEnvironment(
+                                            new DAVAuthListener_Impl(
+                                                xEnv, m_aURL ),
+                                            aHeaders ) );
+        }
+        catch (DAVException const& e)
+        {
+            errorCount++;
+            bRetry = handleException( e, errorCount );
+            if ( !bRetry )
+                throw;
+
+            if ( e.getError() == DAVException::DAV_HTTP_REDIRECT )
+            {
+                // #i74980# - Upon POST redirect, do a GET.
+                return GET( xEnv );
+            }
+        }
+    }
+    while ( bRetry );
+
+    return xStream;
+}
+
+
+void DAVResourceAccess::POST(
+    const OUString & rContentType,
+    const OUString & rReferer,
+    const uno::Reference< io::XInputStream > & rInputStream,
+    uno::Reference< io::XOutputStream > & rOutputStream,
+    const uno::Reference< ucb::XCommandEnvironment >& xEnv )
+{
+    initialize();
+
+    // Make stream seekable, if it not. Needed, if request must be retried.
+    uno::Reference< io::XInputStream > xSeekableStream
+        = comphelper::OSeekableInputWrapper::CheckSeekableCanWrap(
+            rInputStream, m_xContext );
+
+    int errorCount = 0;
+    bool bRetry  = false;
+    do
+    {
+        if ( bRetry )
+        {
+            resetInputStream( xSeekableStream );
+            bRetry = false;
+        }
+
+        try
+        {
+            DAVRequestHeaders aHeaders;
+            getUserRequestHeaders( xEnv,
+                                   getRequestURI(),
+                                   ucb::WebDAVHTTPMethod_POST,
+                                   aHeaders );
+
+            m_xSession->POST( getRequestURI(),
+                              rContentType,
+                              rReferer,
+                              xSeekableStream,
+                              rOutputStream,
+                              DAVRequestEnvironment(
+                                  new DAVAuthListener_Impl( xEnv, m_aURL ),
+                                  aHeaders ) );
+        }
+        catch (DAVException const& e)
+        {
+            errorCount++;
+            bRetry = handleException( e, errorCount );
+            if ( !bRetry )
+                throw;
+
+            if ( e.getError() == DAVException::DAV_HTTP_REDIRECT )
+            {
+                // #i74980# - Upon POST redirect, do a GET.
+                GET( rOutputStream, xEnv );
+                return;
+            }
+        }
+    }
+    while ( bRetry );
+}
+
+
+void DAVResourceAccess::MKCOL(
+    const uno::Reference< ucb::XCommandEnvironment > & xEnv )
+{
+    initialize();
+
+    int errorCount = 0;
+    bool bRetry;
+    do
+    {
+        bRetry = false;
+        try
+        {
+            DAVRequestHeaders aHeaders;
+            getUserRequestHeaders( xEnv,
+                                   getRequestURI(),
+                                   ucb::WebDAVHTTPMethod_MKCOL,
+                                   aHeaders );
+
+            m_xSession->MKCOL( getRequestURI(),
+                               DAVRequestEnvironment(
+                                   new DAVAuthListener_Impl( xEnv, m_aURL ),
+                                   aHeaders ) );
+        }
+        catch (DAVException const& e)
+        {
+            errorCount++;
+            bRetry = handleException( e, errorCount );
+            if ( !bRetry )
+                throw;
+        }
+    }
+    while ( bRetry );
+}
+
+
+void DAVResourceAccess::COPY(
+    const OUString & rSourcePath,
+    const OUString & rDestinationURI,
+    bool bOverwrite,
+    const uno::Reference< ucb::XCommandEnvironment > & xEnv )
+{
+    initialize();
+
+    int errorCount = 0;
+    bool bRetry;
+    do
+    {
+        bRetry = false;
+        try
+        {
+            DAVRequestHeaders aHeaders;
+            getUserRequestHeaders( xEnv,
+                                   getRequestURI(),
+                                   ucb::WebDAVHTTPMethod_COPY,
+                                   aHeaders );
+
+            m_xSession->COPY( rSourcePath,
+                              rDestinationURI,
+                              DAVRequestEnvironment(
+                                  new DAVAuthListener_Impl( xEnv, m_aURL ),
+                                  aHeaders ),
+                              bOverwrite );
+        }
+        catch (DAVException const& e)
+        {
+            errorCount++;
+            bRetry = handleException( e, errorCount );
+            if ( !bRetry )
+                throw;
+        }
+    }
+    while ( bRetry );
+}
+
+
+void DAVResourceAccess::MOVE(
+    const OUString & rSourcePath,
+    const OUString & rDestinationURI,
+    bool bOverwrite,
+    const uno::Reference< ucb::XCommandEnvironment > & xEnv )
+{
+    initialize();
+
+    int errorCount = 0;
+    bool bRetry;
+    do
+    {
+        bRetry = false;
+        try
+        {
+            DAVRequestHeaders aHeaders;
+            getUserRequestHeaders( xEnv,
+                                   getRequestURI(),
+                                   ucb::WebDAVHTTPMethod_MOVE,
+                                   aHeaders );
+
+            m_xSession->MOVE( rSourcePath,
+                              rDestinationURI,
+                              DAVRequestEnvironment(
+                                  new DAVAuthListener_Impl( xEnv, m_aURL ),
+                                  aHeaders ),
+                              bOverwrite );
+        }
+        catch (DAVException const& e)
+        {
+            errorCount++;
+            bRetry = handleException( e, errorCount );
+            if ( !bRetry )
+                throw;
+        }
+    }
+    while ( bRetry );
+}
+
+
+void DAVResourceAccess::DESTROY(
+    const uno::Reference< ucb::XCommandEnvironment > & xEnv )
+{
+    initialize();
+
+    int errorCount = 0;
+    bool bRetry;
+    do
+    {
+        bRetry = false;
+        try
+        {
+            DAVRequestHeaders aHeaders;
+            getUserRequestHeaders( xEnv,
+                                   getRequestURI(),
+                                   ucb::WebDAVHTTPMethod_DELETE,
+                                   aHeaders );
+
+            m_xSession->DESTROY( getRequestURI(),
+                                 DAVRequestEnvironment(
+                                     new DAVAuthListener_Impl( xEnv, m_aURL ),
+                                     aHeaders ) );
+        }
+        catch (DAVException const& e)
+        {
+            errorCount++;
+            bRetry = handleException( e, errorCount );
+            if ( !bRetry )
+                throw;
+        }
+    }
+    while ( bRetry );
+}
+
+
+// set new lock.
+void DAVResourceAccess::LOCK(
+    ucb::Lock & inLock,
+    const uno::Reference< ucb::XCommandEnvironment > & xEnv )
+{
+    initialize();
+
+    int errorCount = 0;
+    bool bRetry;
+    do
+    {
+        bRetry = false;
+        try
+        {
+            DAVRequestHeaders aHeaders;
+            getUserRequestHeaders( xEnv,
+                                   getRequestURI(),
+                                   ucb::WebDAVHTTPMethod_LOCK,
+                                   aHeaders );
+
+            m_xSession->LOCK( getRequestURI(),
+                              inLock,
+                              DAVRequestEnvironment(
+                                  new DAVAuthListener_Impl( xEnv, m_aURL ),
+                                  aHeaders ) );
+        }
+        catch (DAVException const& e)
+        {
+            errorCount++;
+            bRetry = handleException( e, errorCount );
+            if ( !bRetry )
+                throw;
+        }
+    }
+    while ( bRetry );
+}
+
+void DAVResourceAccess::UNLOCK(
+    const uno::Reference< ucb::XCommandEnvironment > & xEnv )
+{
+    initialize();
+
+    int errorCount = 0;
+    bool bRetry;
+    do
+    {
+        bRetry = false;
+        try
+        {
+            DAVRequestHeaders aHeaders;
+            getUserRequestHeaders( xEnv,
+                                   getRequestURI(),
+                                   ucb::WebDAVHTTPMethod_UNLOCK,
+                                   aHeaders );
+
+            m_xSession->UNLOCK( getRequestURI(),
+                                DAVRequestEnvironment(
+                                    new DAVAuthListener_Impl( xEnv, m_aURL ),
+                                    aHeaders ) );
+        }
+        catch (DAVException const& e)
+        {
+            errorCount++;
+            bRetry = handleException( e, errorCount );
+            if ( !bRetry )
+                throw;
+        }
+    }
+    while ( bRetry );
+}
+
+void DAVResourceAccess::setFlags( const uno::Sequence< beans::NamedValue >& rFlags )
+{
+    osl::Guard< osl::Mutex > aGuard( m_aMutex );
+    m_aFlags = rFlags;
+}
+
+void DAVResourceAccess::setURL( const OUString & rNewURL )
+{
+    osl::Guard< osl::Mutex > aGuard( m_aMutex );
+    m_aURL  = rNewURL;
+    m_aPath.clear(); // Next initialize() will create new session.
+}
+
+
+// init dav session and path
+void DAVResourceAccess::initialize()
+{
+    osl::Guard< osl::Mutex > aGuard( m_aMutex );
+    if ( m_aPath.isEmpty() )
+    {
+        CurlUri const aURI( m_aURL );
+        OUString aPath( aURI.GetRelativeReference() );
+
+        /* #134089# - Check URI */
+        if ( aPath.isEmpty() )
+            throw DAVException( DAVException::DAV_INVALID_ARG );
+
+        /* #134089# - Check URI */
+        if ( aURI.GetHost().isEmpty() )
+            throw DAVException( DAVException::DAV_INVALID_ARG );
+
+        if ( !m_xSession.is() || !m_xSession->CanUse( m_aURL, m_aFlags ) )
+        {
+            m_xSession.clear();
+
+            // create new webdav session
+            m_xSession
+                = m_xSessionFactory->createDAVSession( m_aURL, m_aFlags, m_xContext );
+
+            if ( !m_xSession.is() )
+                return;
+        }
+
+        // Own URI is needed to redirect cycle detection.
+        m_aRedirectURIs.push_back( aURI );
+
+        // Success.
+        m_aPath = aPath;
+
+        // Not only the path has to be encoded
+        m_aURL = aURI.GetURI();
+    }
+}
+
+
+const OUString & DAVResourceAccess::getRequestURI() const
+{
+    assert(m_xSession.is() &&
+                "DAVResourceAccess::getRequestURI - Not initialized!");
+
+    // In case a proxy is used we have to use the absolute URI for a request.
+    if ( m_xSession->UsesProxy() )
+        return m_aURL;
+
+    return m_aPath;
+}
+
+
+// static
+void DAVResourceAccess::getUserRequestHeaders(
+    const uno::Reference< ucb::XCommandEnvironment > & xEnv,
+    const OUString & rURI,
+    ucb::WebDAVHTTPMethod eMethod,
+    DAVRequestHeaders & rRequestHeaders )
+{
+    if ( !xEnv.is() )
+        return;
+
+    uno::Reference< ucb::XWebDAVCommandEnvironment > xDAVEnv(
+        xEnv, uno::UNO_QUERY );
+
+    if ( !xDAVEnv.is() )
+        return;
+
+    uno::Sequence< beans::StringPair > aRequestHeaders
+        = xDAVEnv->getUserRequestHeaders( rURI, eMethod );
+
+    for ( sal_Int32 n = 0; n < aRequestHeaders.getLength(); ++n )
+    {
+        rRequestHeaders.push_back(
+            DAVRequestHeader( aRequestHeaders[ n ].First,
+                              aRequestHeaders[ n ].Second ) );
+    }
+}
+
+// This function member implements the control on cyclical redirections
+bool DAVResourceAccess::detectRedirectCycle(
+        ::std::u16string_view const rRedirectURL)
+{
+    osl::Guard< osl::Mutex > aGuard( m_aMutex );
+
+    CurlUri const aUri( rRedirectURL );
+
+    // Check for maximum number of redirections
+    // according to <https://tools.ietf.org/html/rfc7231#section-6.4>.
+    // A practical limit may be 5, due to earlier specifications:
+    // <https://tools.ietf.org/html/rfc2068#section-10.3>
+    // it can be raised keeping in mind the added net activity.
+    if( static_cast< size_t >( m_nRedirectLimit ) <= m_aRedirectURIs.size() )
+        return true;
+
+    // try to detect a cyclical redirection
+    return std::any_of(m_aRedirectURIs.begin(), m_aRedirectURIs.end(),
+        [&aUri](const CurlUri& rUri) { return aUri == rUri; });
+}
+
+
+void DAVResourceAccess::resetUri()
+{
+    osl::Guard< osl::Mutex > aGuard( m_aMutex );
+    if ( ! m_aRedirectURIs.empty() )
+    {
+        auto const it = m_aRedirectURIs.begin();
+
+        CurlUri const aUri( *it );
+        m_aRedirectURIs.clear();
+        setURL ( aUri.GetURI() );
+        initialize();
+    }
+}
+
+
+bool DAVResourceAccess::handleException(DAVException const& e, int const errorCount)
+{
+    switch ( e.getError() )
+    {
+    case DAVException::DAV_HTTP_REDIRECT:
+        if ( !detectRedirectCycle( e.getData() ) )
+        {
+            // set new URL and path.
+            setURL( e.getData() );
+            initialize();
+            return true;
+        }
+        return false;
+        // i#67048 copy & paste images doesn't display. This bug refers
+        // to an old OOo problem about getting resources from sites with a bad connection.
+        // If we have a bad connection try again. Up to three times.
+    case DAVException::DAV_HTTP_ERROR:
+        // retry up to three times, if not a client-side error (4xx error codes)
+        if ( e.getStatus() < SC_BAD_REQUEST && errorCount < 3 )
+            return true;
+        // check the server side errors
+        switch( e.getStatus() )
+        {
+            // the HTTP server side response status codes that can be retried
+            // [Serf TODO? i#119036] case SC_REQUEST_ENTITY_TOO_LARGE:
+            case SC_BAD_GATEWAY:        // retry, can be an excessive load
+            case SC_GATEWAY_TIMEOUT:    // retry, may be we get lucky
+            case SC_SERVICE_UNAVAILABLE: // retry, the service may become available
+            case SC_INSUFFICIENT_STORAGE: // space may be freed, retry
+            {
+                if ( errorCount < 3 )
+                    return true;
+                else
+                    return false;
+            }
+            break;
+            // all the other HTTP server response status codes are NOT retry
+            default:
+                return false;
+        }
+        break;
+    // if connection has said retry then retry!
+    case DAVException::DAV_HTTP_RETRY:
+        return true;
+    // <--
+    default:
+        return false; // Abort
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/DAVResourceAccess.hxx b/ucb/source/ucp/webdav-curl/DAVResourceAccess.hxx
new file mode 100644
index 000000000..0e5231934
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/DAVResourceAccess.hxx
@@ -0,0 +1,220 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#pragma once
+
+#include <vector>
+#include <rtl/ustring.hxx>
+#include <rtl/ref.hxx>
+#include <osl/mutex.hxx>
+#include <com/sun/star/io/XInputStream.hpp>
+#include <com/sun/star/io/XOutputStream.hpp>
+#include <com/sun/star/beans/NamedValue.hpp>
+#include <com/sun/star/ucb/Lock.hpp>
+#include <com/sun/star/ucb/XCommandEnvironment.hpp>
+#include <com/sun/star/ucb/WebDAVHTTPMethod.hpp>
+#include "DAVAuthListener.hxx"
+#include "DAVException.hxx"
+#include "DAVSession.hxx"
+#include "DAVResource.hxx"
+#include "DAVTypes.hxx"
+#include "CurlUri.hxx"
+
+namespace http_dav_ucp
+{
+
+class DAVSessionFactory;
+
+class DAVResourceAccess
+{
+    osl::Mutex    m_aMutex;
+    OUString m_aURL;
+    OUString m_aPath;
+    ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue > m_aFlags;
+    rtl::Reference< DAVSession > m_xSession;
+    rtl::Reference< DAVSessionFactory > m_xSessionFactory;
+    css::uno::Reference< css::uno::XComponentContext > m_xContext;
+    std::vector<CurlUri> m_aRedirectURIs;
+    sal_uInt32   m_nRedirectLimit;
+
+public:
+    DAVResourceAccess() = default;
+    DAVResourceAccess( const css::uno::Reference< css::uno::XComponentContext > & rContext,
+                       rtl::Reference< DAVSessionFactory > const & rSessionFactory,
+                       const OUString & rURL );
+    DAVResourceAccess( const DAVResourceAccess & rOther );
+
+    DAVResourceAccess & operator=( const DAVResourceAccess & rOther );
+
+    /// @throws DAVException
+    void setFlags( const ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue >& rFlags );
+
+    /// @throws DAVException
+    void setURL( const OUString & rNewURL );
+
+    void resetUri();
+
+    const OUString & getURL() const { return m_aURL; }
+
+    const rtl::Reference< DAVSessionFactory > & getSessionFactory() const
+    { return m_xSessionFactory; }
+
+    // DAV methods
+
+    /// @throws DAVException
+    void
+    OPTIONS(
+              DAVOptions & rOptions,
+              const css::uno::Reference< css::ucb::XCommandEnvironment > & xEnv );
+
+    // allprop & named
+    /// @throws DAVException
+    void
+    PROPFIND( const Depth nDepth,
+              const std::vector< OUString > & rPropertyNames,
+              std::vector< DAVResource > & rResources,
+              const css::uno::Reference< css::ucb::XCommandEnvironment > & xEnv );
+
+    // propnames
+    /// @throws DAVException
+    void
+    PROPFIND( const Depth nDepth,
+              std::vector< DAVResourceInfo > & rResInfo,
+              const css::uno::Reference< css::ucb::XCommandEnvironment > & xEnv );
+
+    /// @throws DAVException
+    void
+    PROPPATCH( const std::vector< ProppatchValue > & rValues,
+               const css::uno::Reference< css::ucb::XCommandEnvironment >& xEnv );
+
+    /// @throws DAVException
+    void
+    HEAD( const std::vector< OUString > & rHeaderNames, // empty == 'all'
+          DAVResource & rResource,
+          const css::uno::Reference< css::ucb::XCommandEnvironment >& xEnv );
+
+    /// @throws DAVException
+    css::uno::Reference< css::io::XInputStream >
+    GET( const css::uno::Reference< css::ucb::XCommandEnvironment > & xEnv );
+
+    /// @throws DAVException
+    void
+    GET( css::uno::Reference< css::io::XOutputStream > & rStream,
+         const css::uno::Reference< css::ucb::XCommandEnvironment > & xEnv );
+
+    /// @throws DAVException
+    css::uno::Reference< css::io::XInputStream >
+    GET( const std::vector< OUString > & rHeaderNames, // empty == 'all'
+         DAVResource & rResource,
+         const css::uno::Reference< css::ucb::XCommandEnvironment > & xEnv );
+
+    /// used as HEAD substitute when HEAD is not implemented on server
+    /// @throws DAVException
+    void
+    GET0( DAVRequestHeaders & rRequestHeaders,
+          const std::vector< OUString > & rHeaderNames, // empty == 'all'
+          DAVResource & rResource,
+          const css::uno::Reference< css::ucb::XCommandEnvironment > & xEnv );
+
+    /// @throws DAVException
+    void
+    GET( css::uno::Reference< css::io::XOutputStream > & rStream,
+         const std::vector< OUString > & rHeaderNames, // empty == 'all'
+         DAVResource & rResource,
+         const css::uno::Reference< css::ucb::XCommandEnvironment > & xEnv );
+
+    /// @throws DAVException
+    void
+    PUT( const css::uno::Reference< css::io::XInputStream > & rStream,
+         const css::uno::Reference< css::ucb::XCommandEnvironment > & xEnv );
+
+    /// @throws DAVException
+    css::uno::Reference< css::io::XInputStream >
+    POST( const OUString & rContentType,
+          const OUString & rReferer,
+          const css::uno::Reference< css::io::XInputStream > & rInputStream,
+          const css::uno::Reference< css::ucb::XCommandEnvironment >& xEnv );
+
+    /// @throws DAVException
+    void
+    POST( const OUString & rContentType,
+          const OUString & rReferer,
+          const css::uno::Reference< css::io::XInputStream > & rInputStream,
+          css::uno::Reference< css::io::XOutputStream > & rOutputStream,
+          const css::uno::Reference< css::ucb::XCommandEnvironment >& xEnv );
+
+    /// @throws DAVException
+    void
+    MKCOL( const css::uno::Reference< css::ucb::XCommandEnvironment > & xEnv );
+
+    /// @throws DAVException
+    void
+    COPY( const OUString & rSourcePath,
+          const OUString & rDestinationURI,
+          bool bOverwrite,
+          const css::uno::Reference< css::ucb::XCommandEnvironment > & xEnv );
+
+    /// @throws DAVException
+    void
+    MOVE( const OUString & rSourcePath,
+          const OUString & rDestinationURI,
+          bool bOverwrite,
+          const css::uno::Reference< css::ucb::XCommandEnvironment > & xEnv );
+
+    /// @throws DAVException
+    void
+    DESTROY( const css::uno::Reference< css::ucb::XCommandEnvironment > & xEnv );
+
+    // set new lock.
+    /// @throws DAVException
+    void
+    LOCK( css::ucb::Lock & inLock,
+          const css::uno::Reference< css::ucb::XCommandEnvironment > & xEnv );
+
+    /// @throws DAVException
+    void
+    UNLOCK( const css::uno::Reference< css::ucb::XCommandEnvironment > & xEnv );
+
+    /// @throws DAVException
+    void
+    abort();
+
+    // helper
+    static void
+    getUserRequestHeaders(
+        const css::uno::Reference< css::ucb::XCommandEnvironment > & xEnv,
+        const OUString & rURI,
+        css::ucb::WebDAVHTTPMethod eMethod,
+        DAVRequestHeaders & rRequestHeaders );
+
+    /// @throws DAVException
+    bool handleException(DAVException const& e, int errorCount);
+
+private:
+    const OUString & getRequestURI() const;
+    /// @throws DAVException
+    bool detectRedirectCycle(::std::u16string_view rRedirectURL);
+    /// @throws DAVException
+    void initialize();
+};
+
+} // namespace http_dav_ucp
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/DAVSession.hxx b/ucb/source/ucp/webdav-curl/DAVSession.hxx
new file mode 100644
index 000000000..cb2987831
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/DAVSession.hxx
@@ -0,0 +1,196 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#pragma once
+
+#include <memory>
+#include <rtl/ustring.hxx>
+#include <com/sun/star/io/XInputStream.hpp>
+#include <com/sun/star/io/XOutputStream.hpp>
+#include "DAVResource.hxx"
+#include "DAVSessionFactory.hxx"
+#include "DAVTypes.hxx"
+#include "DAVRequestEnvironment.hxx"
+
+namespace com { namespace sun { namespace star { namespace beans {
+    struct NamedValue;
+} } } }
+
+namespace com::sun::star::ucb {
+    struct Lock;
+}
+
+namespace http_dav_ucp
+{
+
+class DAVAuthListener;
+
+class DAVSession
+{
+public:
+    void acquire()
+    {
+        osl_atomic_increment( &m_nRefCount );
+    }
+
+    void release()
+    {
+        if ( osl_atomic_decrement( &m_nRefCount ) == 0 )
+        {
+            m_xFactory->releaseElement( this );
+            delete this;
+        }
+    }
+
+    virtual bool CanUse( const OUString & rURI,
+            const ::com::sun::star::uno::Sequence<::com::sun::star::beans::NamedValue>& rFlags ) = 0;
+
+    virtual bool UsesProxy() = 0;
+
+    // DAV methods
+
+    virtual void OPTIONS( const OUString & inPath,
+                          DAVOptions & rOptions,
+                          const DAVRequestEnvironment & rEnv ) = 0;
+
+    // allprop & named
+    /// @throws DAVException
+    virtual void PROPFIND( const OUString & inPath,
+                           const Depth inDepth,
+                           const std::vector< OUString > & inPropertyNames,
+                           std::vector< DAVResource > & ioResources,
+                           const DAVRequestEnvironment & rEnv ) = 0;
+
+    // propnames
+    /// @throws DAVException
+    virtual void PROPFIND( const OUString & inPath,
+                           const Depth inDepth,
+                           std::vector< DAVResourceInfo > & ioResInfo,
+                           const DAVRequestEnvironment & rEnv ) = 0;
+
+    /// @throws DAVException
+    virtual void PROPPATCH( const OUString & inPath,
+                            const std::vector< ProppatchValue > & inValues,
+                            const DAVRequestEnvironment & rEnv ) = 0;
+
+    /// @throws DAVException
+    virtual void HEAD( const OUString &  inPath,
+                       const std::vector< OUString > & inHeaderNames,
+                       DAVResource & ioResource,
+                       const DAVRequestEnvironment & rEnv ) = 0;
+
+    /// @throws DAVException
+    virtual css::uno::Reference< css::io::XInputStream >
+    GET( const OUString & inPath,
+         const DAVRequestEnvironment & rEnv ) = 0;
+
+    /// @throws DAVException
+    virtual void GET( const OUString & inPath,
+                      css::uno::Reference< css::io::XOutputStream >& o,
+                      const DAVRequestEnvironment & rEnv ) = 0;
+
+    /// @throws DAVException
+    virtual css::uno::Reference< css::io::XInputStream >
+    GET( const OUString & inPath,
+         const std::vector< OUString > & inHeaderNames,
+         DAVResource & ioResource,
+         const DAVRequestEnvironment & rEnv ) = 0;
+
+    /// @throws DAVException
+    virtual void
+    GET( const OUString & inPath,
+         css::uno::Reference< css::io::XOutputStream >& o,
+         const std::vector< OUString > & inHeaderNames,
+         DAVResource & ioResource,
+         const DAVRequestEnvironment & rEnv ) = 0;
+
+    /// @throws DAVException
+    virtual void PUT( const OUString & inPath,
+                      const css::uno::Reference< css::io::XInputStream >& s,
+                      const DAVRequestEnvironment & rEnv ) = 0;
+
+    /// @throws DAVException
+    virtual css::uno::Reference< css::io::XInputStream >
+    POST( const OUString & inPath,
+          const OUString & rContentType,
+          const OUString & rReferer,
+          const css::uno::Reference< css::io::XInputStream > & inInputStream,
+          const DAVRequestEnvironment & rEnv ) = 0;
+
+    /// @throws DAVException
+    virtual void POST( const OUString & inPath,
+                       const OUString & rContentType,
+                       const OUString & rReferer,
+                       const css::uno::Reference< css::io::XInputStream > & inInputStream,
+                       css::uno::Reference< css::io::XOutputStream > & oOutputStream,
+                       const DAVRequestEnvironment & rEnv ) = 0;
+
+    /// @throws DAVException
+    virtual void MKCOL( const OUString & inPath,
+                        const DAVRequestEnvironment & rEnv ) = 0;
+
+    /// @throws DAVException
+    virtual void COPY( const OUString & inSource,
+                       const OUString & inDestination,
+                       const DAVRequestEnvironment & rEnv,
+                       bool inOverwrite = false ) = 0;
+
+    /// @throws DAVException
+    virtual void MOVE( const OUString & inSource,
+                       const OUString & inDestination,
+                       const DAVRequestEnvironment & rEnv,
+                       bool inOverwrite = false ) = 0;
+
+    /// @throws DAVException
+    virtual void DESTROY( const OUString & inPath,
+                          const DAVRequestEnvironment & rEnv ) = 0;
+
+    // set new lock.
+    /// @throws DAVException
+    virtual void LOCK( const OUString & inPath,
+                       css::ucb::Lock & inLock,
+                       const DAVRequestEnvironment & rEnv ) = 0;
+
+    /// @throws DAVException
+    virtual void UNLOCK( const OUString & inPath,
+                         const DAVRequestEnvironment & rEnv ) = 0;
+
+    /// @throws DAVException
+    virtual void abort() = 0;
+
+protected:
+    rtl::Reference< DAVSessionFactory > m_xFactory;
+
+    explicit DAVSession( rtl::Reference< DAVSessionFactory > const & rFactory )
+        : m_xFactory( rFactory ), m_nRefCount( 0 ) {}
+
+    virtual ~DAVSession() {}
+
+private:
+    DAVSessionFactory::Map::iterator m_aContainerIt;
+    oslInterlockedCount m_nRefCount;
+
+    friend class DAVSessionFactory;
+    friend struct std::default_delete< DAVSession >;
+};
+
+} // namespace http_dav_ucp
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/DAVSessionFactory.cxx b/ucb/source/ucp/webdav-curl/DAVSessionFactory.cxx
new file mode 100644
index 000000000..f2379d2cc
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/DAVSessionFactory.cxx
@@ -0,0 +1,80 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <memory>
+#include "DAVSessionFactory.hxx"
+#include "CurlSession.hxx"
+#include "CurlUri.hxx"
+
+using namespace http_dav_ucp;
+using namespace com::sun::star;
+
+DAVSessionFactory::~DAVSessionFactory()
+{
+}
+
+rtl::Reference< DAVSession > DAVSessionFactory::createDAVSession(
+                const OUString & inUri,
+                const uno::Sequence< beans::NamedValue >& rFlags,
+                const uno::Reference< uno::XComponentContext > & rxContext )
+{
+    std::unique_lock aGuard( m_aMutex );
+
+    if (!m_xProxyDecider)
+        m_xProxyDecider.reset( new ucbhelper::InternetProxyDecider( rxContext ) );
+
+    Map::iterator aIt = std::find_if(m_aMap.begin(), m_aMap.end(),
+        [&inUri, &rFlags](const Map::value_type& rEntry) { return rEntry.second->CanUse( inUri, rFlags ); });
+
+    if ( aIt == m_aMap.end() )
+    {
+        std::unique_ptr< DAVSession > xElement(
+            new CurlSession(rxContext, this, inUri, rFlags, *m_xProxyDecider) );
+
+        aIt = m_aMap.emplace(  inUri, xElement.get() ).first;
+        aIt->second->m_aContainerIt = aIt;
+        xElement.release();
+        return aIt->second;
+    }
+    else if ( osl_atomic_increment( &aIt->second->m_nRefCount ) > 1 )
+    {
+        rtl::Reference< DAVSession > xElement( aIt->second );
+        osl_atomic_decrement( &aIt->second->m_nRefCount );
+        return xElement;
+    }
+    else
+    {
+        osl_atomic_decrement( &aIt->second->m_nRefCount );
+        aIt->second->m_aContainerIt = m_aMap.end();
+
+        aIt->second = new CurlSession(rxContext, this, inUri, rFlags, *m_xProxyDecider);
+        aIt->second->m_aContainerIt = aIt;
+        return aIt->second;
+    }
+}
+
+void DAVSessionFactory::releaseElement( const DAVSession * pElement )
+{
+    assert( pElement );
+    std::unique_lock aGuard( m_aMutex );
+    if ( pElement->m_aContainerIt != m_aMap.end() )
+        m_aMap.erase( pElement->m_aContainerIt );
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/DAVSessionFactory.hxx b/ucb/source/ucp/webdav-curl/DAVSessionFactory.hxx
new file mode 100644
index 000000000..2699035eb
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/DAVSessionFactory.hxx
@@ -0,0 +1,74 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#ifdef min
+#undef min // GNU libstdc++ <memory> includes <limit> which defines methods called min...
+#endif
+#include <map>
+#include <memory>
+#include <mutex>
+#include <salhelper/simplereferenceobject.hxx>
+#include <rtl/ref.hxx>
+#include <com/sun/star/uno/Reference.hxx>
+#include <ucbhelper/proxydecider.hxx>
+
+using namespace com::sun::star;
+
+namespace com::sun::star::beans
+{
+struct NamedValue;
+}
+
+namespace com::sun::star::lang
+{
+class XMultiServiceFactory;
+}
+
+namespace http_dav_ucp
+{
+class DAVSession;
+
+class DAVSessionFactory : public salhelper::SimpleReferenceObject
+{
+public:
+    virtual ~DAVSessionFactory() override;
+
+    /// @throws DAVException
+    rtl::Reference<DAVSession> createDAVSession(
+        const OUString& inUri,
+        const ::com::sun::star::uno::Sequence<::com::sun::star::beans::NamedValue>& rFlags,
+        const css::uno::Reference<css::uno::XComponentContext>& rxContext);
+
+private:
+    typedef std::map<OUString, DAVSession*> Map;
+
+    Map m_aMap;
+    std::mutex m_aMutex;
+    std::unique_ptr<ucbhelper::InternetProxyDecider> m_xProxyDecider;
+
+    void releaseElement(const DAVSession* pElement);
+
+    friend class DAVSession;
+};
+
+} // namespace http_dav_ucp
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/DAVTypes.cxx b/ucb/source/ucp/webdav-curl/DAVTypes.cxx
new file mode 100644
index 000000000..e41c5426e
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/DAVTypes.cxx
@@ -0,0 +1,207 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+
+#include "DAVTypes.hxx"
+
+#include "CurlUri.hxx"
+#include "../inc/urihelper.hxx"
+
+#include <osl/time.h>
+
+
+using namespace http_dav_ucp;
+using namespace com::sun::star;
+
+// DAVOptions implementation
+
+DAVOptions::DAVOptions() :
+    m_isClass1( false ),
+    m_isClass2( false ),
+    m_isClass3( false ),
+    m_isHeadAllowed( true ),
+    m_isLocked( false ),
+    m_aAllowedMethods(),
+    m_nStaleTime( 0 ),
+    m_nRequestedTimeLife( 0 ),
+    m_sURL(),
+    m_sRedirectedURL(),
+    m_nHttpResponseStatusCode( 0 ),
+    m_sHttpResponseStatusText()
+{
+}
+
+DAVOptions::DAVOptions( const DAVOptions & rOther ) :
+    m_isClass1( rOther.m_isClass1 ),
+    m_isClass2( rOther.m_isClass2 ),
+    m_isClass3( rOther.m_isClass3 ),
+    m_isHeadAllowed( rOther.m_isHeadAllowed ),
+    m_isLocked( rOther.m_isLocked ),
+    m_aAllowedMethods( rOther.m_aAllowedMethods ),
+    m_nStaleTime( rOther.m_nStaleTime ),
+    m_nRequestedTimeLife( rOther.m_nRequestedTimeLife ),
+    m_sURL( rOther.m_sURL ),
+    m_sRedirectedURL( rOther.m_sRedirectedURL),
+    m_nHttpResponseStatusCode( rOther.m_nHttpResponseStatusCode ),
+    m_sHttpResponseStatusText( rOther.m_sHttpResponseStatusText )
+{
+}
+
+DAVOptions::~DAVOptions()
+{
+}
+
+DAVOptions & DAVOptions::operator=( const DAVOptions& rOpts )
+{
+    m_isClass1 = rOpts.m_isClass1;
+    m_isClass2 = rOpts.m_isClass2;
+    m_isClass3 = rOpts.m_isClass3;
+    m_isLocked = rOpts.m_isLocked;
+    m_isHeadAllowed = rOpts.m_isHeadAllowed;
+    m_aAllowedMethods = rOpts.m_aAllowedMethods;
+    m_nStaleTime = rOpts.m_nStaleTime;
+    m_nRequestedTimeLife = rOpts.m_nRequestedTimeLife;
+    m_sURL = rOpts.m_sURL;
+    m_sRedirectedURL = rOpts.m_sRedirectedURL;
+    m_nHttpResponseStatusCode = rOpts.m_nHttpResponseStatusCode;
+    m_sHttpResponseStatusText = rOpts.m_sHttpResponseStatusText;
+    return *this;
+}
+
+bool DAVOptions::operator==( const DAVOptions& rOpts ) const
+{
+    return
+        m_isClass1 == rOpts.m_isClass1 &&
+        m_isClass2 == rOpts.m_isClass2 &&
+        m_isClass3 == rOpts.m_isClass3 &&
+        m_isLocked == rOpts.m_isLocked &&
+        m_isHeadAllowed == rOpts.m_isHeadAllowed &&
+        m_aAllowedMethods == rOpts.m_aAllowedMethods &&
+        m_nStaleTime == rOpts.m_nStaleTime &&
+        m_nRequestedTimeLife == rOpts.m_nRequestedTimeLife &&
+        m_sURL == rOpts.m_sURL &&
+        m_sRedirectedURL == rOpts.m_sRedirectedURL &&
+        m_nHttpResponseStatusCode == rOpts.m_nHttpResponseStatusCode &&
+        m_sHttpResponseStatusText == rOpts.m_sHttpResponseStatusText;
+}
+
+
+// DAVOptionsCache implementation
+
+DAVOptionsCache::DAVOptionsCache()
+{
+}
+
+DAVOptionsCache::~DAVOptionsCache()
+{
+}
+
+bool DAVOptionsCache::getDAVOptions( const OUString & rURL, DAVOptions & rDAVOptions )
+{
+    std::unique_lock aGuard( m_aMutex );
+    OUString aEncodedUrl( ucb_impl::urihelper::encodeURI( DecodeURI(rURL) ) );
+    normalizeURLLastChar( aEncodedUrl );
+
+    // search the URL in the static map
+    DAVOptionsMap::iterator it;
+    it = m_aTheCache.find( aEncodedUrl );
+    if ( it == m_aTheCache.end() )
+        return false;
+    else
+    {
+        // check if the capabilities are stale, before restoring
+        TimeValue t1;
+        osl_getSystemTime( &t1 );
+        if ( (*it).second.getStaleTime() < t1.Seconds )
+        {
+            // if stale, remove from cache, do not restore
+            m_aTheCache.erase( it );
+            return false;
+            // return false instead
+        }
+        rDAVOptions = (*it).second;
+        return true;
+    }
+}
+
+void DAVOptionsCache::removeDAVOptions( const OUString & rURL )
+{
+    std::unique_lock aGuard( m_aMutex );
+    OUString aEncodedUrl( ucb_impl::urihelper::encodeURI( DecodeURI(rURL) ) );
+    normalizeURLLastChar( aEncodedUrl );
+
+    DAVOptionsMap::iterator it;
+    it = m_aTheCache.find( aEncodedUrl );
+    if ( it != m_aTheCache.end() )
+    {
+        m_aTheCache.erase( it );
+    }
+}
+
+void DAVOptionsCache::addDAVOptions( DAVOptions & rDAVOptions, const sal_uInt32 nLifeTime )
+{
+    std::unique_lock aGuard( m_aMutex );
+    OUString aURL( rDAVOptions.getURL() );
+
+    OUString aEncodedUrl( ucb_impl::urihelper::encodeURI( DecodeURI(aURL) ) );
+    normalizeURLLastChar( aEncodedUrl );
+    rDAVOptions.setURL( aEncodedUrl );
+
+// unchanged, it may be used to access a server
+    OUString aRedirURL( rDAVOptions.getRedirectedURL() );
+    rDAVOptions.setRedirectedURL( aRedirURL );
+
+    // check if already cached
+    DAVOptionsMap::iterator it;
+    it = m_aTheCache.find( aEncodedUrl );
+    if ( it != m_aTheCache.end() )
+    { // already in cache, check LifeTime
+        if ( (*it).second.getRequestedTimeLife() == nLifeTime )
+            return; // same lifetime, do nothing
+
+        // tdf#153642 keep cached Class1 bit at aDAVOptionsException to avoid of
+        // losing the ability to resave the document within the lifetime because
+        // of disabled DAV detection in getResourceType()
+        if ((*it).second.isClass1())
+        {
+            rDAVOptions.setClass1( (*it).second.isClass1() );
+        }
+    }
+    // not in cache, add it
+    TimeValue t1;
+    osl_getSystemTime( &t1 );
+    rDAVOptions.setStaleTime( t1.Seconds + nLifeTime );
+
+    m_aTheCache[ aEncodedUrl ] = rDAVOptions;
+}
+
+void DAVOptionsCache::setHeadAllowed( const OUString & rURL, const bool HeadAllowed )
+{
+    std::unique_lock aGuard( m_aMutex );
+    OUString aEncodedUrl( ucb_impl::urihelper::encodeURI( DecodeURI(rURL) ) );
+    normalizeURLLastChar( aEncodedUrl );
+
+    DAVOptionsMap::iterator it;
+    it = m_aTheCache.find( aEncodedUrl );
+    if ( it != m_aTheCache.end() )
+    {
+        // first check for stale
+        TimeValue t1;
+        osl_getSystemTime( &t1 );
+        if( (*it).second.getStaleTime() < t1.Seconds )
+        {
+            m_aTheCache.erase( it );
+            return;
+        }
+        // check if the resource was present on server
+        (*it).second.setHeadAllowed( HeadAllowed );
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
diff --git a/ucb/source/ucp/webdav-curl/DAVTypes.hxx b/ucb/source/ucp/webdav-curl/DAVTypes.hxx
new file mode 100644
index 000000000..8e6160333
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/DAVTypes.hxx
@@ -0,0 +1,200 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#pragma once
+
+#include <memory>
+#include <map>
+#include <mutex>
+#include <rtl/ustring.hxx>
+#include <com/sun/star/uno/Any.hxx>
+
+namespace http_dav_ucp
+{
+/* Excerpt from RFC 4918
+   <https://tools.ietf.org/html/rfc4918#section-18>
+
+   18.1 Class 1
+
+   A class 1 compliant resource MUST meet all "MUST" requirements in all
+   sections of this document.
+
+   Class 1 compliant resources MUST return, at minimum, the value "1" in
+   the DAV header on all responses to the OPTIONS method.
+
+   18.2 Class 2
+
+   A class 2 compliant resource MUST meet all class 1 requirements and
+   support the LOCK method, the DAV:supportedlock property, the DAV:
+   lockdiscovery property, the Time-Out response header and the Lock-
+   Token request header.  A class 2 compliant resource SHOULD also
+   support the Timeout request header and the 'owner' XML element.
+
+   Class 2 compliant resources MUST return, at minimum, the values "1"
+   and "2" in the DAV header on all responses to the OPTIONS method.
+
+   18.3.  Class 3
+
+   A resource can explicitly advertise its support for the revisions to
+   [RFC2518] made in this document.  Class 1 MUST be supported as well.
+   Class 2 MAY be supported.  Advertising class 3 support in addition to
+   class 1 and 2 means that the server supports all the requirements in
+   this specification.  Advertising class 3 and class 1 support, but not
+   class 2, means that the server supports all the requirements in this
+   specification except possibly those that involve locking support.
+
+*/
+
+    class DAVOptions
+    {
+    private:
+        bool    m_isClass1;
+        bool    m_isClass2;
+        bool    m_isClass3;
+        /// for server that do not implement it
+        bool    m_isHeadAllowed;
+        /// Internally used to maintain the locked state of the resource, only if it's a Class 2 resource
+        bool    m_isLocked;
+        /// contains the methods allowed on this resource
+        OUString    m_aAllowedMethods;
+
+        /// target time when this capability becomes stale
+        sal_uInt32 m_nStaleTime;
+        sal_uInt32 m_nRequestedTimeLife;
+        OUString  m_sURL;
+        OUString  m_sRedirectedURL;
+
+        /// The cached HTT response status code. It's 0 if the code was dealt with and there is no need to cache it
+        sal_uInt16 m_nHttpResponseStatusCode;
+        /// The cached string with the server returned HTTP response status code string, corresponds to m_nHttpResponseStatusCode.
+        OUString  m_sHttpResponseStatusText;
+
+    public:
+        DAVOptions();
+
+        DAVOptions( const DAVOptions & rOther );
+
+        ~DAVOptions();
+
+        bool isClass1() const { return m_isClass1; };
+        void setClass1( bool Class1 = true ) { m_isClass1 = Class1; };
+
+        bool isClass2() const { return m_isClass2; };
+        void setClass2( bool Class2 = true ) { m_isClass2 = Class2; };
+
+        bool isClass3() const { return m_isClass3; };
+        void setClass3( bool Class3 = true ) { m_isClass3 = Class3; };
+
+        bool isHeadAllowed() const { return m_isHeadAllowed; };
+        void setHeadAllowed( bool HeadAllowed = true ) { m_isHeadAllowed = HeadAllowed; };
+
+        sal_uInt32 getStaleTime() const { return m_nStaleTime ; };
+        void setStaleTime( const sal_uInt32 nStaleTime ) { m_nStaleTime = nStaleTime; };
+
+        sal_uInt32 getRequestedTimeLife() const { return m_nRequestedTimeLife; };
+        void setRequestedTimeLife( const sal_uInt32 nRequestedTimeLife ) { m_nRequestedTimeLife = nRequestedTimeLife; };
+
+        const OUString & getURL() const { return m_sURL; };
+        void setURL( const OUString & sURL ) { m_sURL = sURL; };
+
+        const OUString & getRedirectedURL() const { return m_sRedirectedURL; };
+        void setRedirectedURL( const OUString & sRedirectedURL ) { m_sRedirectedURL = sRedirectedURL; };
+
+        void  setAllowedMethods( const OUString & aAllowedMethods ) { m_aAllowedMethods = aAllowedMethods; } ;
+        const OUString & getAllowedMethods() const { return m_aAllowedMethods; } ;
+        bool isLockAllowed() const { return ( m_aAllowedMethods.indexOf( "LOCK" ) != -1 ); };
+
+        void setLocked( bool locked = true ) { m_isLocked = locked; } ;
+        bool isLocked() const { return m_isLocked; };
+
+        sal_uInt16 getHttpResponseStatusCode() const { return m_nHttpResponseStatusCode; };
+        void setHttpResponseStatusCode( const sal_uInt16 nHttpResponseStatusCode ) { m_nHttpResponseStatusCode = nHttpResponseStatusCode; };
+
+        const OUString & getHttpResponseStatusText() const { return m_sHttpResponseStatusText; };
+        void setHttpResponseStatusText( const OUString & rHttpResponseStatusText ) { m_sHttpResponseStatusText = rHttpResponseStatusText; };
+
+        void init() {
+            m_isClass1 = false;
+            m_isClass2 = false;
+            m_isClass3 = false;
+            m_isHeadAllowed = true;
+            m_isLocked = false;
+            m_aAllowedMethods.clear();
+            m_nStaleTime = 0;
+            m_nRequestedTimeLife = 0;
+            m_sURL.clear();
+            m_sRedirectedURL.clear();
+            m_nHttpResponseStatusCode = 0;
+            m_sHttpResponseStatusText.clear();
+        };
+
+        DAVOptions & operator=( const DAVOptions& rOpts );
+        bool operator==( const DAVOptions& rOpts ) const;
+
+    };
+
+    // TODO: the OUString key element in std::map needs to be changed with a URI representation
+    // along with a specific compare (std::less) implementation, as suggested in
+    // <https://tools.ietf.org/html/rfc3986#section-6>, to find by URI and not by string comparison
+    typedef std::map< OUString, DAVOptions,
+                      std::less< OUString > > DAVOptionsMap;
+
+    class DAVOptionsCache
+    {
+        DAVOptionsMap m_aTheCache;
+        std::mutex    m_aMutex;
+    public:
+        explicit DAVOptionsCache();
+        ~DAVOptionsCache();
+
+        bool getDAVOptions( const OUString & rURL, DAVOptions & rDAVOptions );
+        void removeDAVOptions( const OUString & rURL );
+        void addDAVOptions( DAVOptions & rDAVOptions, const sal_uInt32 nLifeTime );
+
+        void setHeadAllowed( const OUString & rURL, bool HeadAllowed = true );
+
+    private:
+
+        /// remove the last '/' in aUrl, if it exists
+        static void normalizeURLLastChar( OUString& aUrl ) {
+            if ( aUrl.getLength() > 1 &&
+                 ( ( aUrl.lastIndexOf( '/' ) + 1 ) == aUrl.getLength() ) )
+                aUrl = aUrl.copy(0, aUrl.getLength() - 1 );
+        };
+    };
+
+    enum Depth { DAVZERO = 0, DAVONE = 1, DAVINFINITY = -1 };
+
+    enum ProppatchOperation { PROPSET = 0, PROPREMOVE = 1 };
+
+    struct ProppatchValue
+    {
+        ProppatchOperation const  operation;
+        OUString const            name;
+        css::uno::Any const       value;
+
+        ProppatchValue( const ProppatchOperation o,
+                        const OUString & n,
+                        const css::uno::Any & v )
+            : operation( o ), name( n ), value( v ) {}
+    };
+} // namespace http_dav_ucp
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/DateTimeHelper.cxx b/ucb/source/ucp/webdav-curl/DateTimeHelper.cxx
new file mode 100644
index 000000000..06514d682
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/DateTimeHelper.cxx
@@ -0,0 +1,258 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <osl/time.h>
+#include <com/sun/star/util/DateTime.hpp>
+#include "DateTimeHelper.hxx"
+
+using namespace com::sun::star::util;
+
+using namespace http_dav_ucp;
+
+bool DateTimeHelper::ISO8601_To_DateTime (const OUString& s,
+    DateTime& dateTime)
+{
+    OString aDT (s.getStr(), s.getLength(), RTL_TEXTENCODING_ASCII_US);
+
+    int year, month, day, hours, minutes, off_hours, off_minutes, fix;
+    double seconds;
+
+    // 2001-01-01T12:30:00Z
+    int n = sscanf( aDT.getStr(), "%04d-%02d-%02dT%02d:%02d:%lfZ",
+                    &year, &month, &day, &hours, &minutes, &seconds );
+    if ( n == 6 )
+    {
+        fix = 0;
+    }
+    else
+    {
+        // 2001-01-01T12:30:00+03:30
+        n = sscanf( aDT.getStr(), "%04d-%02d-%02dT%02d:%02d:%lf+%02d:%02d",
+                    &year, &month, &day, &hours, &minutes, &seconds,
+                    &off_hours, &off_minutes );
+        if ( n == 8 )
+        {
+            fix = - off_hours * 3600 - off_minutes * 60;
+        }
+        else
+        {
+            // 2001-01-01T12:30:00-03:30
+            n = sscanf( aDT.getStr(), "%04d-%02d-%02dT%02d:%02d:%lf-%02d:%02d",
+                        &year, &month, &day, &hours, &minutes, &seconds,
+                        &off_hours, &off_minutes );
+            if ( n == 8 )
+            {
+                fix = off_hours * 3600 + off_minutes * 60;
+            }
+            else
+            {
+                return false;
+            }
+        }
+    }
+
+    // Convert to local time...
+
+    oslDateTime aDateTime;
+    aDateTime.NanoSeconds = 0;
+    aDateTime.Seconds     = sal::static_int_cast< sal_uInt16 >(seconds); // 0-59
+    aDateTime.Minutes     = sal::static_int_cast< sal_uInt16 >(minutes); // 0-59
+    aDateTime.Hours       = sal::static_int_cast< sal_uInt16 >(hours); // 0-23
+    aDateTime.Day         = sal::static_int_cast< sal_uInt16 >(day); // 1-31
+    aDateTime.DayOfWeek   = 0;          // 0-6, 0 = Sunday
+    aDateTime.Month       = sal::static_int_cast< sal_uInt16 >(month); // 1-12
+    aDateTime.Year        = sal::static_int_cast< sal_Int16  >(year);
+
+    TimeValue aTimeValue;
+    if ( osl_getTimeValueFromDateTime( &aDateTime, &aTimeValue ) )
+    {
+        aTimeValue.Seconds += fix;
+
+        if ( osl_getLocalTimeFromSystemTime( &aTimeValue, &aTimeValue ) )
+        {
+            if ( osl_getDateTimeFromTimeValue( &aTimeValue, &aDateTime ) )
+            {
+                dateTime.Year    = aDateTime.Year;
+                dateTime.Month   = aDateTime.Month;
+                dateTime.Day     = aDateTime.Day;
+                dateTime.Hours   = aDateTime.Hours;
+                dateTime.Minutes = aDateTime.Minutes;
+                dateTime.Seconds = aDateTime.Seconds;
+
+                return true;
+            }
+        }
+    }
+
+    return false;
+}
+
+/*
+sal_Int32 DateTimeHelper::convertDayToInt (const OUString& day)
+{
+    if (day.equalsAscii("Sun"))
+        return 0;
+    else if (day.equalsAscii("Mon"))
+        return 1;
+    else if (day.equalsAscii("Tue"))
+        return 2;
+    else if (day.equalsAscii("Wed"))
+        return 3;
+    else if (day.equalsAscii("Thu"))
+        return 4;
+    else if (day.equalsAscii("Fri"))
+        return 5;
+    else if (day.equalsAscii("Sat"))
+        return 6;
+    else
+        return -1;
+}
+*/
+
+sal_Int32 DateTimeHelper::convertMonthToInt(std::u16string_view month)
+{
+    if (month == u"Jan")
+        return 1;
+    else if (month == u"Feb")
+        return 2;
+    else if (month == u"Mar")
+        return 3;
+    else if (month == u"Apr")
+        return 4;
+    else if (month == u"May")
+        return 5;
+    else if (month == u"Jun")
+        return 6;
+    else if (month == u"Jul")
+        return 7;
+    else if (month == u"Aug")
+        return 8;
+    else if (month == u"Sep")
+        return 9;
+    else if (month == u"Oct")
+        return 10;
+    else if (month == u"Nov")
+        return 11;
+    else if (month == u"Dec")
+        return 12;
+    else
+        return 0;
+}
+
+bool DateTimeHelper::RFC2068_To_DateTime (const OUString& s,
+    DateTime& dateTime)
+{
+    int year;
+    int day;
+    int hours;
+    int minutes;
+    int seconds;
+    char string_month[3 + 1];
+    char string_day[3 + 1];
+
+    sal_Int32 found = s.indexOf (',');
+    if (found != -1)
+    {
+        OString aDT (s.getStr(), s.getLength(), RTL_TEXTENCODING_ASCII_US);
+
+        // RFC 1123
+        found = sscanf (aDT.getStr(), "%3s, %2d %3s %4d %2d:%2d:%2d GMT",
+                        string_day, &day, string_month, &year, &hours, &minutes, &seconds);
+        if (found != 7)
+        {
+            // RFC 1036
+            found = sscanf (aDT.getStr(), "%3s, %2d-%3s-%2d %2d:%2d:%2d GMT",
+                            string_day, &day, string_month, &year, &hours, &minutes, &seconds);
+        }
+        found = (found == 7) ? 1 : 0;
+    }
+    else
+    {
+        OString aDT (s.getStr(), s.getLength(), RTL_TEXTENCODING_ASCII_US);
+
+        // ANSI C's asctime () format
+        found = sscanf (aDT.getStr(), "%3s %3s %d %2d:%2d:%2d %4d",
+                        string_day, string_month,
+                        &day, &hours, &minutes, &seconds, &year);
+        found = (found == 7) ? 1 : 0;
+    }
+
+    if (found)
+    {
+        found = 0;
+
+        int month = DateTimeHelper::convertMonthToInt (
+                            OUString::createFromAscii (string_month));
+        if (month)
+        {
+            // Convert to local time...
+
+            oslDateTime aDateTime;
+            aDateTime.NanoSeconds = 0;
+            aDateTime.Seconds     = sal::static_int_cast< sal_uInt16 >(seconds);
+                // 0-59
+            aDateTime.Minutes     = sal::static_int_cast< sal_uInt16 >(minutes);
+                // 0-59
+            aDateTime.Hours       = sal::static_int_cast< sal_uInt16 >(hours);
+                // 0-23
+            aDateTime.Day         = sal::static_int_cast< sal_uInt16 >(day);
+                // 1-31
+            aDateTime.DayOfWeek   = 0; //dayofweek;  // 0-6, 0 = Sunday
+            aDateTime.Month       = sal::static_int_cast< sal_uInt16 >(month);
+                // 1-12
+            aDateTime.Year        = sal::static_int_cast< sal_Int16  >(year);
+
+            TimeValue aTimeValue;
+            if ( osl_getTimeValueFromDateTime( &aDateTime,
+                                                &aTimeValue ) )
+            {
+                if ( osl_getLocalTimeFromSystemTime( &aTimeValue,
+                                                        &aTimeValue ) )
+                {
+                    if ( osl_getDateTimeFromTimeValue( &aTimeValue,
+                                                        &aDateTime ) )
+                    {
+                        dateTime.Year    = aDateTime.Year;
+                        dateTime.Month   = aDateTime.Month;
+                        dateTime.Day     = aDateTime.Day;
+                        dateTime.Hours   = aDateTime.Hours;
+                        dateTime.Minutes = aDateTime.Minutes;
+                        dateTime.Seconds = aDateTime.Seconds;
+
+                        found = 1;
+                    }
+                }
+            }
+        }
+    }
+
+    return found;
+}
+
+bool DateTimeHelper::convert (const OUString& s, DateTime& dateTime)
+{
+    if (ISO8601_To_DateTime (s, dateTime))
+        return true;
+    else if (RFC2068_To_DateTime (s, dateTime))
+        return true;
+    else
+        return false;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/DateTimeHelper.hxx b/ucb/source/ucp/webdav-curl/DateTimeHelper.hxx
new file mode 100644
index 000000000..22a8e9519
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/DateTimeHelper.hxx
@@ -0,0 +1,55 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#pragma once
+
+#include <sal/types.h>
+#include <rtl/ustring.hxx>
+
+namespace com::sun::star::util {
+    struct DateTime;
+}
+
+namespace rtl {
+    class OUString;
+}
+
+namespace http_dav_ucp
+{
+
+class DateTimeHelper
+{
+private:
+    static sal_Int32 convertMonthToInt(std::u16string_view month);
+
+    static bool ISO8601_To_DateTime (const OUString&,
+        css::util::DateTime& );
+
+    static bool RFC2068_To_DateTime (const OUString&,
+        css::util::DateTime& );
+
+public:
+    static bool convert (const OUString&,
+        css::util::DateTime& );
+};
+
+} // namespace http_dav_ucp
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/PropertyMap.hxx b/ucb/source/ucp/webdav-curl/PropertyMap.hxx
new file mode 100644
index 000000000..e38ca5c44
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/PropertyMap.hxx
@@ -0,0 +1,55 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#pragma once
+
+#include <com/sun/star/beans/Property.hpp>
+#include <unordered_set>
+
+namespace http_dav_ucp {
+
+struct equalPropertyName
+{
+  bool operator()( const css::beans::Property & p1,
+                   const css::beans::Property & p2 ) const
+  {
+        return p1.Name == p2.Name;
+  }
+};
+
+struct hashPropertyName
+{
+    size_t operator()( const css::beans::Property & p ) const
+    {
+        return p.Name.hashCode();
+    }
+};
+
+typedef std::unordered_set
+<
+    css::beans::Property,
+    hashPropertyName,
+    equalPropertyName
+>
+PropertyMap;
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/PropfindCache.cxx b/ucb/source/ucp/webdav-curl/PropfindCache.cxx
new file mode 100644
index 000000000..7196bd791
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/PropfindCache.cxx
@@ -0,0 +1,91 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <osl/time.h>
+#include "PropfindCache.hxx"
+
+namespace http_dav_ucp
+{
+
+    // PropertyNames implementation
+
+    PropertyNames::PropertyNames() :
+        m_nStaleTime( 0 ),
+        m_sURL(),
+        m_aPropertiesNames()
+    {
+    }
+
+    PropertyNames::PropertyNames( const OUString& rURL ) :
+        m_nStaleTime( 0 ),
+        m_sURL( rURL ),
+        m_aPropertiesNames()
+    {
+    }
+
+    //PropertyNamesCache implementation
+
+    PropertyNamesCache::PropertyNamesCache()
+    {
+    }
+
+    PropertyNamesCache::~PropertyNamesCache()
+    {
+    }
+
+    bool PropertyNamesCache::getCachedPropertyNames( const OUString& rURL, PropertyNames& rCacheElement )
+    {
+        // search the URL in the static map
+        std::unique_lock aGuard( m_aMutex );
+        PropNameCache::const_iterator it;
+        it = m_aTheCache.find( rURL );
+        if ( it == m_aTheCache.end() )
+            return false;
+        else
+        {
+            // check if the element is stale, before restoring
+            TimeValue t1;
+            osl_getSystemTime( &t1 );
+            if ( (*it).second.getStaleTime() < t1.Seconds )
+            {
+                // if stale, remove from cache, do not restore
+                m_aTheCache.erase( it );
+                return false;
+                // return false instead
+            }
+            rCacheElement = (*it).second;
+            return true;
+        }
+    }
+
+    void PropertyNamesCache::removeCachedPropertyNames( const OUString& rURL )
+    {
+        std::unique_lock aGuard( m_aMutex );
+        PropNameCache::const_iterator it;
+        it = m_aTheCache.find( rURL );
+        if ( it != m_aTheCache.end() )
+        {
+            m_aTheCache.erase( it );
+        }
+    }
+
+    void PropertyNamesCache::addCachePropertyNames( PropertyNames& rCacheElement, const sal_uInt32 nLifeTime )
+    {
+        std::unique_lock aGuard( m_aMutex );
+        OUString aURL( rCacheElement.getURL() );
+        TimeValue t1;
+        osl_getSystemTime( &t1 );
+        rCacheElement.setStaleTime( t1.Seconds + nLifeTime );
+
+        m_aTheCache[ aURL ] = rCacheElement;
+    }
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
diff --git a/ucb/source/ucp/webdav-curl/PropfindCache.hxx b/ucb/source/ucp/webdav-curl/PropfindCache.hxx
new file mode 100644
index 000000000..b55ef2a51
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/PropfindCache.hxx
@@ -0,0 +1,80 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_UCB_SOURCE_UCP_WEBDAV_NEON_PROPFINDCACHE_HXX
+#define INCLUDED_UCB_SOURCE_UCP_WEBDAV_NEON_PROPFINDCACHE_HXX
+
+#include <sal/types.h>
+#include <rtl/ustring.hxx>
+#include <mutex>
+#include <map>
+#include <vector>
+
+#include "DAVResource.hxx"
+
+namespace http_dav_ucp
+{
+    // A property names cache mechanism, URL driven.
+    // It is used to cache the property names received
+    // from the WebDAV server, to minimize the need of
+    // net transactions (e.g. PROPFIND).
+    // The cache lifetime should be short
+    // just to remove the annoying slowness when
+    // typing text or moving cursor around when the
+    // net link is slow.
+
+    // Define the properties cache element
+    class PropertyNames
+    {
+        /// target time when this element becomes stale
+        sal_uInt32 m_nStaleTime;
+        OUString    m_sURL;
+        // the property name list received from WebDAV server
+        std::vector< DAVResourceInfo > m_aPropertiesNames;
+
+    public:
+        PropertyNames();
+        explicit PropertyNames( const OUString& rURL );
+
+        sal_uInt32 getStaleTime() const { return m_nStaleTime; };
+        void setStaleTime( const sal_uInt32 nStaleTime ) { m_nStaleTime = nStaleTime; };
+
+        OUString& getURL() { return m_sURL; };
+
+        const std::vector< DAVResourceInfo >& getPropertiesNames() { return m_aPropertiesNames; };
+        void setPropertiesNames( const std::vector< DAVResourceInfo >& aPropertiesNames ) { m_aPropertiesNames = aPropertiesNames; };
+    };
+
+    // Define the PropertyNames cache
+    // TODO: the OUString key element in std::map needs to be changed with a URI representation
+    // with a specific compare (std::less) implementation, this last one implementing
+    // as suggested in <https://tools.ietf.org/html/rfc3986#section-6>.
+    // To find by URI and not by string equality.
+    typedef std::map< OUString, PropertyNames,
+                      std::less< OUString > >PropNameCache;
+
+    class PropertyNamesCache
+    {
+        PropNameCache       m_aTheCache;
+        std::mutex          m_aMutex;
+
+    public:
+        PropertyNamesCache();
+        ~PropertyNamesCache();
+
+        bool getCachedPropertyNames( const OUString& URL, PropertyNames& rCacheElement );
+        void removeCachedPropertyNames( const OUString& URL );
+        void addCachePropertyNames( PropertyNames& rCacheElement, const sal_uInt32 nLifeTime );
+    };
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
diff --git a/ucb/source/ucp/webdav-curl/SerfLockStore.cxx b/ucb/source/ucp/webdav-curl/SerfLockStore.cxx
new file mode 100644
index 000000000..005e7c5f1
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/SerfLockStore.cxx
@@ -0,0 +1,256 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <rtl/ustring.hxx>
+#include <sal/log.hxx>
+#include <osl/time.h>
+#include <osl/thread.hxx>
+#include <salhelper/thread.hxx>
+
+#include <com/sun/star/ucb/LockScope.hpp>
+
+#include "CurlSession.hxx"
+#include "SerfLockStore.hxx"
+
+using namespace http_dav_ucp;
+
+namespace http_dav_ucp {
+
+class TickerThread : public salhelper::Thread
+{
+    bool m_bFinish;
+    SerfLockStore & m_rLockStore;
+
+public:
+
+    explicit TickerThread( SerfLockStore & rLockStore )
+        : Thread( "WebDavTickerThread" ), m_bFinish( false ),
+          m_rLockStore( rLockStore ) {}
+
+    void finish() { m_bFinish = true; }
+
+private:
+
+    virtual void execute();
+};
+
+} // namespace http_dav_ucp
+
+
+void TickerThread::execute()
+{
+    osl_setThreadName("http_dav_ucp::TickerThread");
+
+    SAL_INFO("ucb.ucp.webdav",  "TickerThread: start." );
+
+    // we have to go through the loop more often to be able to finish ~quickly
+    const int nNth = 25;
+
+    int nCount = nNth;
+    while ( !m_bFinish )
+    {
+        if ( nCount-- <= 0 )
+        {
+            m_rLockStore.refreshLocks();
+            nCount = nNth;
+        }
+
+        TimeValue aTV;
+        aTV.Seconds = 0;
+        aTV.Nanosec = 1000000000 / nNth;
+        salhelper::Thread::wait( aTV );
+    }
+
+    SAL_INFO("ucb.ucp.webdav",  "TickerThread: stop." );
+}
+
+
+SerfLockStore::SerfLockStore()
+{
+}
+
+
+SerfLockStore::~SerfLockStore()
+{
+    std::unique_lock aGuard(m_aMutex);
+    stopTicker(aGuard);
+    aGuard.lock(); // actually no threads should even try to access members now
+
+    // release active locks, if any.
+    SAL_WARN_IF( !m_aLockInfoMap.empty(), "ucb.ucp.webdav",
+                "SerfLockStore::~SerfLockStore - Releasing active locks!" );
+
+    for ( auto& rLockInfo : m_aLockInfoMap )
+    {
+        rLockInfo.second.m_xSession->NonInteractive_UNLOCK(rLockInfo.first);
+    }
+}
+
+void SerfLockStore::startTicker()
+{
+    std::unique_lock aGuard( m_aMutex );
+
+    if ( !m_pTickerThread.is() )
+    {
+        m_pTickerThread = new TickerThread( *this );
+        m_pTickerThread->launch();
+    }
+}
+
+
+void SerfLockStore::stopTicker(std::unique_lock<std::mutex> & rGuard)
+{
+    rtl::Reference<TickerThread> pTickerThread;
+
+    if (m_pTickerThread.is())
+    {
+        m_pTickerThread->finish(); // needs mutex
+        // the TickerThread may run refreshLocks() at most once after this
+        pTickerThread = m_pTickerThread;
+        m_pTickerThread.clear();
+    }
+
+    rGuard.unlock();
+
+    if (pTickerThread.is() && pTickerThread->getIdentifier() != osl::Thread::getCurrentIdentifier())
+    {
+        pTickerThread->join(); // without m_aMutex locked (to prevent deadlock)
+    }
+}
+
+OUString const*
+SerfLockStore::getLockTokenForURI(OUString const& rURI, css::ucb::Lock const*const pLock)
+{
+    assert(rURI.startsWith("http://") || rURI.startsWith("https://"));
+
+    std::unique_lock aGuard( m_aMutex );
+
+    auto const it(m_aLockInfoMap.find(rURI));
+
+    if (it == m_aLockInfoMap.end())
+    {
+        return nullptr;
+    }
+    if (!pLock) // any lock will do
+    {
+        return &it->second.m_sToken;
+    }
+    // 0: EXCLUSIVE 1: SHARED
+    if (it->second.m_Lock.Scope == ucb::LockScope_SHARED && pLock->Scope == ucb::LockScope_EXCLUSIVE)
+    {
+        return nullptr;
+    }
+    assert(it->second.m_Lock.Type == pLock->Type); // only WRITE possible
+    if (it->second.m_Lock.Depth < pLock->Depth)
+    {
+        return nullptr;
+    }
+    // Only own locks are expected in the lock store, but depending on the
+    // server it->second.m_Lock.Owner may contain the string this UCP passed in
+    // the LOCK request, or a user identifier generated by the server (happens
+    // with Sharepoint), so just ignore it here.
+    // ignore Timeout ?
+    return &it->second.m_sToken;
+}
+
+void SerfLockStore::addLock( const OUString& rURI,
+                             ucb::Lock const& rLock,
+                             const OUString& sToken,
+                             rtl::Reference<CurlSession> const & xSession,
+                             sal_Int32 nLastChanceToSendRefreshRequest )
+{
+    assert(rURI.startsWith("http://") || rURI.startsWith("https://"));
+    {
+        std::unique_lock aGuard( m_aMutex );
+
+        m_aLockInfoMap[ rURI ]
+            = LockInfo(sToken, rLock, xSession, nLastChanceToSendRefreshRequest);
+    }
+
+    startTicker();
+}
+
+
+void SerfLockStore::removeLock(const OUString& rURI)
+{
+    std::unique_lock aGuard( m_aMutex );
+
+    removeLockImpl(aGuard, rURI);
+}
+
+void SerfLockStore::removeLockImpl(std::unique_lock<std::mutex> & rGuard, const OUString& rURI)
+{
+    assert(rURI.startsWith("http://") || rURI.startsWith("https://"));
+
+    m_aLockInfoMap.erase(rURI);
+
+    if ( m_aLockInfoMap.empty() )
+    {
+        stopTicker(rGuard);
+    }
+}
+
+void SerfLockStore::refreshLocks()
+{
+    std::unique_lock aGuard( m_aMutex );
+
+    ::std::vector<OUString> authFailedLocks;
+
+    for ( auto& rLockInfo : m_aLockInfoMap )
+    {
+        LockInfo & rInfo = rLockInfo.second;
+        if ( rInfo.m_nLastChanceToSendRefreshRequest != -1 )
+        {
+            // 30 seconds or less remaining until lock expires?
+            TimeValue t1;
+            osl_getSystemTime( &t1 );
+            if ( rInfo.m_nLastChanceToSendRefreshRequest - 30
+                     <= sal_Int32( t1.Seconds ) )
+            {
+                // refresh the lock.
+                sal_Int32 nlastChanceToSendRefreshRequest = -1;
+                bool isAuthFailed(false);
+                if (rInfo.m_xSession->NonInteractive_LOCK(
+                         rLockInfo.first, rLockInfo.second.m_sToken,
+                         nlastChanceToSendRefreshRequest,
+                         isAuthFailed))
+                {
+                    rInfo.m_nLastChanceToSendRefreshRequest
+                        = nlastChanceToSendRefreshRequest;
+                }
+                else
+                {
+                    if (isAuthFailed)
+                    {
+                        authFailedLocks.push_back(rLockInfo.first);
+                    }
+                    // refresh failed. stop auto-refresh.
+                    rInfo.m_nLastChanceToSendRefreshRequest = -1;
+                }
+            }
+        }
+    }
+
+    for (auto const& rLock : authFailedLocks)
+    {
+        removeLockImpl(aGuard, rLock);
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/SerfLockStore.hxx b/ucb/source/ucp/webdav-curl/SerfLockStore.hxx
new file mode 100644
index 000000000..6765c7990
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/SerfLockStore.hxx
@@ -0,0 +1,91 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#pragma once
+
+#include <map>
+#include <mutex>
+#include <rtl/ref.hxx>
+#include <rtl/ustring.hxx>
+#include <com/sun/star/ucb/Lock.hpp>
+
+#include "CurlSession.hxx"
+
+namespace http_dav_ucp
+{
+
+class TickerThread;
+
+struct LockInfo
+{
+    OUString m_sToken;
+    css::ucb::Lock m_Lock;
+    rtl::Reference<CurlSession> m_xSession;
+    sal_Int32 m_nLastChanceToSendRefreshRequest;
+
+    LockInfo()
+        : m_nLastChanceToSendRefreshRequest( -1 ) {}
+
+    LockInfo( const OUString& sToken,
+              css::ucb::Lock const& rLock,
+              rtl::Reference<CurlSession> const & xSession,
+              sal_Int32 nLastChanceToSendRefreshRequest )
+        : m_sToken(sToken)
+        , m_Lock(rLock)
+        , m_xSession(xSession)
+        , m_nLastChanceToSendRefreshRequest(nLastChanceToSendRefreshRequest)
+    {}
+};
+
+typedef std::map< OUString, LockInfo > LockInfoMap;
+
+class SerfLockStore
+{
+    std::mutex         m_aMutex;
+    rtl::Reference< TickerThread > m_pTickerThread;
+    LockInfoMap        m_aLockInfoMap;
+
+public:
+    SerfLockStore();
+    ~SerfLockStore();
+
+    OUString const* getLockTokenForURI(OUString const& rURI, css::ucb::Lock const* pLock);
+
+    void addLock( const OUString& rURI,
+                  css::ucb::Lock const& rLock,
+                  const OUString& sToken,
+                  rtl::Reference<CurlSession> const & xSession,
+                  // time in seconds since Jan 1 1970
+                  // -1: infinite lock, no refresh
+                  sal_Int32 nLastChanceToSendRefreshRequest );
+
+    void removeLock(const OUString& rURI);
+
+    void refreshLocks();
+
+private:
+    void removeLockImpl(std::unique_lock<std::mutex> & rGuard, const OUString& rURI);
+    void startTicker();
+    void stopTicker(std::unique_lock<std::mutex> & rGuard);
+};
+
+} // namespace http_dav_ucp
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/UCBDeadPropertyValue.cxx b/ucb/source/ucp/webdav-curl/UCBDeadPropertyValue.cxx
new file mode 100644
index 000000000..1bcf87eac
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/UCBDeadPropertyValue.cxx
@@ -0,0 +1,220 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/log.hxx>
+#include <o3tl/string_view.hxx>
+#include "UCBDeadPropertyValue.hxx"
+
+using namespace http_dav_ucp;
+using namespace ::com::sun::star;
+
+
+// static
+constexpr OUStringLiteral aTypeString = u"string";
+constexpr OUStringLiteral aTypeLong = u"long";
+constexpr OUStringLiteral aTypeShort = u"short";
+constexpr OUStringLiteral aTypeBoolean = u"boolean";
+constexpr OUStringLiteral aTypeChar = u"char";
+constexpr OUStringLiteral aTypeByte = u"byte";
+constexpr OUStringLiteral aTypeHyper = u"hyper";
+constexpr OUStringLiteral aTypeFloat = u"float";
+constexpr OUStringLiteral aTypeDouble = u"double";
+
+// static
+bool UCBDeadPropertyValue::supportsType( const uno::Type & rType )
+{
+    if ( ( rType != cppu::UnoType<OUString>::get() )
+         &&
+         ( rType != cppu::UnoType<sal_Int32>::get() )
+         &&
+         ( rType != cppu::UnoType<sal_Int16>::get() )
+         &&
+         ( rType != cppu::UnoType<bool>::get() )
+         &&
+         ( rType != cppu::UnoType<cppu::UnoCharType>::get() )
+         &&
+         ( rType != cppu::UnoType<sal_Int8>::get() )
+         &&
+         ( rType != cppu::UnoType<sal_Int64>::get() )
+         &&
+         ( rType != cppu::UnoType<float>::get() )
+         &&
+         ( rType != cppu::UnoType<double>::get() ) )
+    {
+        return false;
+    }
+
+    return true;
+}
+
+
+// static
+bool UCBDeadPropertyValue::createFromXML(std::u16string_view rType,
+                                         OUString const& rValue,
+                                         uno::Any & rOutData)
+{
+    bool success = true;
+
+    if (o3tl::equalsIgnoreAsciiCase(rType, aTypeString))
+    {
+        rOutData <<= rValue;
+    }
+    else if (o3tl::equalsIgnoreAsciiCase(rType, aTypeLong))
+    {
+        rOutData <<= rValue.toInt32();
+    }
+    else if (o3tl::equalsIgnoreAsciiCase(rType, aTypeShort))
+    {
+        rOutData <<= sal_Int16( rValue.toInt32() );
+    }
+    else if (o3tl::equalsIgnoreAsciiCase(rType, aTypeBoolean))
+    {
+        if (rValue.equalsIgnoreAsciiCase(u"true"))
+        {
+            rOutData <<= true;
+        }
+        else
+        {
+            rOutData <<= false;
+        }
+    }
+    else if (o3tl::equalsIgnoreAsciiCase(rType, aTypeChar))
+    {
+        rOutData <<= rValue.toChar();
+    }
+    else if (o3tl::equalsIgnoreAsciiCase(rType, aTypeByte))
+    {
+        rOutData <<= sal_Int8( rValue.toChar() );
+    }
+    else if (o3tl::equalsIgnoreAsciiCase(rType, aTypeHyper))
+    {
+        rOutData <<= rValue.toInt64();
+    }
+    else if (o3tl::equalsIgnoreAsciiCase(rType, aTypeFloat))
+    {
+        rOutData <<= rValue.toFloat();
+    }
+    else if (o3tl::equalsIgnoreAsciiCase(rType, aTypeDouble))
+    {
+        rOutData <<= rValue.toDouble();
+    }
+    else
+    {
+        SAL_WARN( "ucb.ucp.webdav",
+                    "UCBDeadPropertyValue::createFromXML - "
+                    "Unsupported property type!" );
+        success = false;
+    }
+    return success;
+}
+
+// static
+::std::optional<::std::pair<OUString, OUString>>
+UCBDeadPropertyValue::toXML(const uno::Any & rInData)
+{
+    // <ucbprop><type>the_type</type><value>the_value</value></ucbprop>
+
+    // Check property type. Extract type and value as string.
+
+    const uno::Type& rType = rInData.getValueType();
+    OUString aStringValue;
+    OUString aStringType;
+
+    if ( rType == cppu::UnoType<OUString>::get() )
+    {
+        // string
+        rInData >>= aStringValue;
+        aStringType = aTypeString;
+    }
+    else if ( rType == cppu::UnoType<sal_Int32>::get() )
+    {
+        // long
+        sal_Int32 nValue = 0;
+        rInData >>= nValue;
+        aStringValue = OUString::number( nValue );
+        aStringType = aTypeLong;
+    }
+    else if ( rType == cppu::UnoType<sal_Int16>::get() )
+    {
+        // short
+        sal_Int32 nValue = 0;
+        rInData >>= nValue;
+        aStringValue = OUString::number( nValue );
+        aStringType = aTypeShort;
+    }
+    else if ( rType == cppu::UnoType<bool>::get() )
+    {
+        // boolean
+        bool bValue = false;
+        rInData >>= bValue;
+        aStringValue = OUString::boolean( bValue );
+        aStringType = aTypeBoolean;
+    }
+    else if ( rType == cppu::UnoType<cppu::UnoCharType>::get() )
+    {
+        // char
+        sal_Unicode cValue = 0;
+        rInData >>= cValue;
+        aStringValue = OUString( cValue );
+        aStringType = aTypeChar;
+    }
+    else if ( rType == cppu::UnoType<sal_Int8>::get() )
+    {
+        // byte
+        sal_Int8 nValue = 0;
+        rInData >>= nValue;
+        aStringValue = OUString( sal_Unicode( nValue ) );
+        aStringType = aTypeByte;
+    }
+    else if ( rType == cppu::UnoType<sal_Int64>::get() )
+    {
+        // hyper
+        sal_Int64 nValue = 0;
+        rInData >>= nValue;
+        aStringValue = OUString::number( nValue );
+        aStringType = aTypeHyper;
+    }
+    else if ( rType == cppu::UnoType<float>::get() )
+    {
+        // float
+        float nValue = 0;
+        rInData >>= nValue;
+        aStringValue = OUString::number( nValue );
+        aStringType = aTypeFloat;
+    }
+    else if ( rType == cppu::UnoType<double>::get() )
+    {
+        // double
+        double nValue = 0;
+        rInData >>= nValue;
+        aStringValue = OUString::number( nValue );
+        aStringType = aTypeDouble;
+    }
+    else
+    {
+        SAL_WARN( "ucb.ucp.webdav",
+                    "UCBDeadPropertyValue::toXML - "
+                    "Unsupported property type!" );
+        return {};
+    }
+
+    return { { aStringType, aStringValue } };
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/UCBDeadPropertyValue.hxx b/ucb/source/ucp/webdav-curl/UCBDeadPropertyValue.hxx
new file mode 100644
index 000000000..12574e0a9
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/UCBDeadPropertyValue.hxx
@@ -0,0 +1,45 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#pragma once
+
+#include <optional>
+#include <utility>
+
+#include <com/sun/star/uno/Any.hxx>
+
+namespace http_dav_ucp
+{
+
+class UCBDeadPropertyValue
+{
+public:
+    static bool supportsType( const css::uno::Type & rType );
+
+    static bool createFromXML(std::u16string_view rType,
+                              OUString const& rValue,
+                              css::uno::Any & rOutData);
+    static ::std::optional<::std::pair<OUString, OUString>>
+                toXML(const css::uno::Any & rInData);
+};
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/ucpdav1.component b/ucb/source/ucp/webdav-curl/ucpdav1.component
new file mode 100644
index 000000000..bb16e3b39
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/ucpdav1.component
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ -->
+
+<component loader="com.sun.star.loader.SharedLibrary" environment="@CPPU_ENV@"
+    xmlns="http://openoffice.org/2010/uno-components">
+  <implementation name="com.sun.star.comp.WebDAVContentProvider"
+    constructor="ucb_webdav_ContentProvider_get_implementation">
+    <service name="com.sun.star.ucb.WebDAVContentProvider"/>
+  </implementation>
+</component>
diff --git a/ucb/source/ucp/webdav-curl/webdavcontent.cxx b/ucb/source/ucp/webdav-curl/webdavcontent.cxx
new file mode 100644
index 000000000..acd850a24
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/webdavcontent.cxx
@@ -0,0 +1,4305 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <memory>
+
+#include <cppuhelper/queryinterface.hxx>
+#include <rtl/uri.hxx>
+#include <sal/log.hxx>
+#include <officecfg/Office/Common.hxx>
+#include <officecfg/Inet.hxx>
+#include <ucbhelper/contentidentifier.hxx>
+#include <ucbhelper/macros.hxx>
+#include <ucbhelper/propertyvalueset.hxx>
+#include <ucbhelper/simpleinteractionrequest.hxx>
+#include <ucbhelper/cancelcommandexecution.hxx>
+#include <svl/lockfilecommon.hxx>
+
+#include <com/sun/star/beans/IllegalTypeException.hpp>
+#include <com/sun/star/beans/NotRemoveableException.hpp>
+#include <com/sun/star/beans/PropertyAttribute.hpp>
+#include <com/sun/star/beans/PropertyExistException.hpp>
+#include <com/sun/star/beans/PropertySetInfoChange.hpp>
+#include <com/sun/star/beans/PropertySetInfoChangeEvent.hpp>
+#include <com/sun/star/beans/PropertyValue.hpp>
+#include <com/sun/star/io/XActiveDataSink.hpp>
+#include <com/sun/star/io/XOutputStream.hpp>
+#include <com/sun/star/lang/IllegalAccessException.hpp>
+#include <com/sun/star/lang/IllegalArgumentException.hpp>
+#include <com/sun/star/sdbc/SQLException.hpp>
+#include <com/sun/star/task/PasswordContainerInteractionHandler.hpp>
+#include <com/sun/star/ucb/CommandEnvironment.hpp>
+#include <com/sun/star/ucb/CommandFailedException.hpp>
+#include <com/sun/star/ucb/ContentInfoAttribute.hpp>
+#include <com/sun/star/ucb/IllegalIdentifierException.hpp>
+#include <com/sun/star/ucb/InsertCommandArgument.hpp>
+#include <com/sun/star/ucb/InteractiveBadTransferURLException.hpp>
+#include <com/sun/star/ucb/InteractiveAugmentedIOException.hpp>
+#include <com/sun/star/ucb/InteractiveLockingLockedException.hpp>
+#include <com/sun/star/ucb/InteractiveLockingLockExpiredException.hpp>
+#include <com/sun/star/ucb/InteractiveLockingNotLockedException.hpp>
+#include <com/sun/star/ucb/InteractiveNetworkConnectException.hpp>
+#include <com/sun/star/ucb/InteractiveNetworkGeneralException.hpp>
+#include <com/sun/star/ucb/InteractiveNetworkReadException.hpp>
+#include <com/sun/star/ucb/InteractiveNetworkResolveNameException.hpp>
+#include <com/sun/star/ucb/InteractiveNetworkWriteException.hpp>
+#include <com/sun/star/ucb/MissingInputStreamException.hpp>
+#include <com/sun/star/ucb/MissingPropertiesException.hpp>
+#include <com/sun/star/ucb/NameClash.hpp>
+#include <com/sun/star/ucb/NameClashException.hpp>
+#include <com/sun/star/ucb/OpenCommandArgument3.hpp>
+#include <com/sun/star/ucb/OpenMode.hpp>
+#include <com/sun/star/ucb/PostCommandArgument2.hpp>
+#include <com/sun/star/ucb/PropertyCommandArgument.hpp>
+#include <com/sun/star/ucb/TransferInfo.hpp>
+#include <com/sun/star/ucb/UnsupportedCommandException.hpp>
+#include <com/sun/star/ucb/UnsupportedDataSinkException.hpp>
+#include <com/sun/star/ucb/UnsupportedNameClashException.hpp>
+#include <com/sun/star/ucb/UnsupportedOpenModeException.hpp>
+#include <com/sun/star/ucb/XCommandInfo.hpp>
+#include <com/sun/star/ucb/XPersistentPropertySet.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+
+#include "webdavcontent.hxx"
+#include "webdavprovider.hxx"
+#include "webdavresultset.hxx"
+#include "ContentProperties.hxx"
+#include "CurlUri.hxx"
+#include "UCBDeadPropertyValue.hxx"
+#include "DAVException.hxx"
+#include "DAVProperties.hxx"
+
+using namespace com::sun::star;
+using namespace http_dav_ucp;
+
+namespace
+{
+void lcl_sendPartialGETRequest( bool &bError,
+                                DAVException &aLastException,
+                                const std::vector< OUString >& rProps,
+                                std::vector< OUString > &aHeaderNames,
+                                const std::unique_ptr< DAVResourceAccess > &xResAccess,
+                                std::unique_ptr< ContentProperties > &xProps,
+                                const uno::Reference< ucb::XCommandEnvironment >& xEnv )
+{
+    DAVResource aResource;
+    DAVRequestHeaders aPartialGet;
+    aPartialGet.push_back(
+        DAVRequestHeader(
+            OUString( "Range" ), // see <https://tools.ietf.org/html/rfc7233#section-3.1>
+            OUString( "bytes=0-0" )));
+
+    bool bIsRequestSize = std::any_of(aHeaderNames.begin(), aHeaderNames.end(),
+        [](const OUString& rHeaderName) { return rHeaderName == "Content-Length"; });
+
+    if ( bIsRequestSize )
+    {
+        // we need to know if the server accepts range requests for a resource
+        // and the range unit it uses
+        aHeaderNames.push_back( OUString( "Accept-Ranges" ) ); // see <https://tools.ietf.org/html/rfc7233#section-2.3>
+        aHeaderNames.push_back( OUString( "Content-Range" ) ); // see <https://tools.ietf.org/html/rfc7233#section-4.2>
+    }
+    try
+    {
+        xResAccess->GET0( aPartialGet, aHeaderNames, aResource, xEnv );
+        bError = false;
+
+        if ( bIsRequestSize )
+        {
+            // the ContentProperties maps "Content-Length" to the UCB "Size" property
+            // This would have an unrealistic value of 1 byte because we did only a partial GET
+            // Solution: if "Content-Range" is present, map it with UCB "Size" property
+            OUString aAcceptRanges, aContentRange, aContentLength;
+            std::vector< DAVPropertyValue > &aResponseProps = aResource.properties;
+            for ( const auto& rResponseProp : aResponseProps )
+            {
+                if ( rResponseProp.Name == "Accept-Ranges" )
+                    rResponseProp.Value >>= aAcceptRanges;
+                else if ( rResponseProp.Name == "Content-Range" )
+                    rResponseProp.Value >>= aContentRange;
+                else if ( rResponseProp.Name == "Content-Length" )
+                    rResponseProp.Value >>= aContentLength;
+            }
+
+            sal_Int64 nSize = 1;
+            if ( aContentLength.getLength() )
+            {
+                nSize = aContentLength.toInt64();
+            }
+
+            // according to http://tools.ietf.org/html/rfc2616#section-3.12
+            // the only range unit defined is "bytes" and implementations
+            // MAY ignore ranges specified using other units.
+            if ( nSize == 1 &&
+                    aContentRange.getLength() &&
+                    aAcceptRanges == "bytes" )
+            {
+                // Parse the Content-Range to get the size
+                // vid. http://tools.ietf.org/html/rfc2616#section-14.16
+                // Content-Range: <range unit> <bytes range>/<size>
+                sal_Int32 nSlash = aContentRange.lastIndexOf( '/' );
+                if ( nSlash != -1 )
+                {
+                    OUString aSize = aContentRange.copy( nSlash + 1 );
+                    // "*" means that the instance-length is unknown at the time when the response was generated
+                    if ( aSize != "*" )
+                    {
+                        auto it = std::find_if(aResponseProps.begin(), aResponseProps.end(),
+                            [](const DAVPropertyValue& rProp) { return rProp.Name == "Content-Length"; });
+                        if (it != aResponseProps.end())
+                        {
+                            it->Value <<= aSize;
+                        }
+                    }
+                }
+            }
+        }
+
+        if (xProps)
+            xProps->addProperties(
+                rProps,
+                ContentProperties( aResource ) );
+        else
+            xProps.reset ( new ContentProperties( aResource ) );
+    }
+    catch ( DAVException const & ex )
+    {
+        aLastException = ex;
+    }
+}
+}
+
+// Static value, to manage a simple OPTIONS cache
+// Key is the URL, element is the DAVOptions resulting from an OPTIONS call.
+// Cached DAVOptions have a lifetime that depends on the errors received or not received
+// and on the value of received options.
+static DAVOptionsCache aStaticDAVOptionsCache;
+
+
+// Content Implementation.
+
+
+// ctr for content on an existing webdav resource
+Content::Content(
+          const uno::Reference< uno::XComponentContext >& rxContext,
+          ContentProvider* pProvider,
+          const uno::Reference< ucb::XContentIdentifier >& Identifier,
+          rtl::Reference< DAVSessionFactory > const & rSessionFactory )
+: ContentImplHelper( rxContext, pProvider, Identifier ),
+  m_eResourceType( UNKNOWN ),
+  m_eResourceTypeForLocks( UNKNOWN ),
+  m_pProvider( pProvider ),
+  m_bTransient( false ),
+  m_bCollection( false ),
+  m_bDidGetOrHead( false )
+{
+    try
+    {
+        initOptsCacheLifeTime();
+        m_xResAccess.reset( new DAVResourceAccess(
+                rxContext,
+                rSessionFactory,
+                Identifier->getContentIdentifier() ) );
+
+        CurlUri const aURI( Identifier->getContentIdentifier() );
+        m_aEscapedTitle = aURI.GetPathBaseName();
+    }
+    catch ( DAVException const & )
+    {
+        throw ucb::ContentCreationException();
+    }
+}
+
+
+// ctr for content on a non-existing webdav resource
+Content::Content(
+            const uno::Reference< uno::XComponentContext >& rxContext,
+            ContentProvider* pProvider,
+            const uno::Reference< ucb::XContentIdentifier >& Identifier,
+            rtl::Reference< DAVSessionFactory > const & rSessionFactory,
+            bool isCollection )
+: ContentImplHelper( rxContext, pProvider, Identifier ),
+  m_eResourceType( UNKNOWN ),
+  m_eResourceTypeForLocks( UNKNOWN ),
+  m_pProvider( pProvider ),
+  m_bTransient( true ),
+  m_bCollection( isCollection ),
+  m_bDidGetOrHead( false )
+{
+    try
+    {
+        initOptsCacheLifeTime();
+        m_xResAccess.reset( new DAVResourceAccess(
+            rxContext, rSessionFactory, Identifier->getContentIdentifier() ) );
+    }
+    catch ( DAVException const & )
+    {
+        throw ucb::ContentCreationException();
+    }
+
+    // Do not set m_aEscapedTitle here! Content::insert relays on this!!!
+}
+
+
+// virtual
+Content::~Content()
+{
+}
+
+
+// XInterface methods.
+
+
+// virtual
+void SAL_CALL Content::acquire() noexcept
+{
+    ContentImplHelper::acquire();
+}
+
+
+// virtual
+void SAL_CALL Content::release() noexcept
+{
+    ContentImplHelper::release();
+}
+
+
+// virtual
+uno::Any SAL_CALL Content::queryInterface( const uno::Type & rType )
+{
+    // Note: isFolder may require network activities! So call it only
+    //       if it is really necessary!!!
+    uno::Any aRet = cppu::queryInterface(
+        rType,
+        static_cast< ucb::XContentCreator * >( this ) );
+    if ( aRet.hasValue() )
+    {
+        try
+        {
+            uno::Reference< task::XInteractionHandler > xIH(
+                task::PasswordContainerInteractionHandler::create(m_xContext) );
+
+            // Supply a command env to isFolder() that contains an interaction
+            // handler that uses the password container service to obtain
+            // credentials without displaying a password gui.
+
+            uno::Reference< ucb::XCommandEnvironment > xCmdEnv(
+                ucb::CommandEnvironment::create(
+                   m_xContext,
+                   xIH,
+                   uno::Reference< ucb::XProgressHandler >() ) );
+
+            return isFolder( xCmdEnv ) ? aRet : uno::Any();
+        }
+        catch ( uno::RuntimeException const & )
+        {
+            throw;
+        }
+        catch ( uno::Exception const & )
+        {
+            return uno::Any();
+        }
+    }
+    return aRet.hasValue() ? aRet : ContentImplHelper::queryInterface( rType );
+}
+
+
+// XTypeProvider methods.
+
+
+XTYPEPROVIDER_COMMON_IMPL( Content );
+
+
+// virtual
+uno::Sequence< uno::Type > SAL_CALL Content::getTypes()
+{
+    bool bFolder = false;
+    try
+    {
+        bFolder
+            = isFolder( uno::Reference< ucb::XCommandEnvironment >() );
+    }
+    catch ( uno::RuntimeException const & )
+    {
+        throw;
+    }
+    catch ( uno::Exception const & )
+    {
+    }
+
+    if ( bFolder )
+    {
+        static cppu::OTypeCollection s_aFolderTypes(
+                        CPPU_TYPE_REF( lang::XTypeProvider ),
+                        CPPU_TYPE_REF( lang::XServiceInfo ),
+                        CPPU_TYPE_REF( lang::XComponent ),
+                        CPPU_TYPE_REF( ucb::XContent ),
+                        CPPU_TYPE_REF( ucb::XCommandProcessor ),
+                        CPPU_TYPE_REF( beans::XPropertiesChangeNotifier ),
+                        CPPU_TYPE_REF( ucb::XCommandInfoChangeNotifier ),
+                        CPPU_TYPE_REF( beans::XPropertyContainer ),
+                        CPPU_TYPE_REF( beans::XPropertySetInfoChangeNotifier ),
+                        CPPU_TYPE_REF( container::XChild ),
+                        CPPU_TYPE_REF( ucb::XContentCreator ) );
+
+        return s_aFolderTypes.getTypes();
+    }
+    else
+    {
+        static cppu::OTypeCollection s_aDocumentTypes(
+                        CPPU_TYPE_REF( lang::XTypeProvider ),
+                        CPPU_TYPE_REF( lang::XServiceInfo ),
+                        CPPU_TYPE_REF( lang::XComponent ),
+                        CPPU_TYPE_REF( ucb::XContent ),
+                        CPPU_TYPE_REF( ucb::XCommandProcessor ),
+                        CPPU_TYPE_REF( beans::XPropertiesChangeNotifier ),
+                        CPPU_TYPE_REF( ucb::XCommandInfoChangeNotifier ),
+                        CPPU_TYPE_REF( beans::XPropertyContainer ),
+                        CPPU_TYPE_REF( beans::XPropertySetInfoChangeNotifier ),
+                        CPPU_TYPE_REF( container::XChild ) );
+
+        return  s_aDocumentTypes.getTypes();
+    }
+}
+
+
+// XServiceInfo methods.
+
+
+// virtual
+OUString SAL_CALL Content::getImplementationName()
+{
+    return "com.sun.star.comp.ucb.WebDAVContent";
+}
+
+
+// virtual
+uno::Sequence< OUString > SAL_CALL Content::getSupportedServiceNames()
+{
+    uno::Sequence<OUString> aSNS { WEBDAV_CONTENT_SERVICE_NAME };
+    return aSNS;
+}
+
+
+// XContent methods.
+
+
+// virtual
+OUString SAL_CALL Content::getContentType()
+{
+    bool bFolder = false;
+    try
+    {
+        bFolder
+            = isFolder( uno::Reference< ucb::XCommandEnvironment >() );
+    }
+    catch ( uno::RuntimeException const & )
+    {
+        throw;
+    }
+    catch ( uno::Exception const & )
+    {
+    }
+
+    if ( bFolder )
+        return WEBDAV_COLLECTION_TYPE;
+
+    return WEBDAV_CONTENT_TYPE;
+}
+
+
+// XCommandProcessor methods.
+
+
+// virtual
+uno::Any SAL_CALL Content::execute(
+        const ucb::Command& aCommand,
+        sal_Int32 /*CommandId*/,
+        const uno::Reference< ucb::XCommandEnvironment >& Environment )
+{
+    SAL_INFO("ucb.ucp.webdav",  ">>>>> Content::execute: start: command: " << aCommand.Name
+            << ", env: " << (Environment.is() ? "present" : "missing") );
+
+    uno::Any aRet;
+
+    if ( aCommand.Name == "getPropertyValues" )
+    {
+
+        // getPropertyValues
+
+
+        uno::Sequence< beans::Property > Properties;
+        if ( !( aCommand.Argument >>= Properties ) )
+        {
+            ucbhelper::cancelCommandExecution(
+                uno::Any( lang::IllegalArgumentException(
+                                    "Wrong argument type!",
+                                    static_cast< cppu::OWeakObject * >( this ),
+                                    -1 ) ),
+                Environment );
+            // Unreachable
+        }
+
+        aRet <<= getPropertyValues( Properties, Environment );
+    }
+    else if ( aCommand.Name == "setPropertyValues" )
+    {
+
+        // setPropertyValues
+
+
+        uno::Sequence< beans::PropertyValue > aProperties;
+        if ( !( aCommand.Argument >>= aProperties ) )
+        {
+            ucbhelper::cancelCommandExecution(
+                uno::Any( lang::IllegalArgumentException(
+                                    "Wrong argument type!",
+                                    static_cast< cppu::OWeakObject * >( this ),
+                                    -1 ) ),
+                Environment );
+            // Unreachable
+        }
+
+        if ( !aProperties.getLength() )
+        {
+            ucbhelper::cancelCommandExecution(
+                uno::Any( lang::IllegalArgumentException(
+                                    "No properties!",
+                                    static_cast< cppu::OWeakObject * >( this ),
+                                    -1 ) ),
+                Environment );
+            // Unreachable
+        }
+
+        aRet <<= setPropertyValues( aProperties, Environment );
+    }
+    else if ( aCommand.Name == "getPropertySetInfo" )
+    {
+
+        // getPropertySetInfo
+
+
+        // Note: Implemented by base class.
+        aRet <<= getPropertySetInfo( Environment,
+                                     false /* don't cache data */ );
+    }
+    else if ( aCommand.Name == "getCommandInfo" )
+    {
+
+        // getCommandInfo
+
+
+        // Note: Implemented by base class.
+        aRet <<= getCommandInfo( Environment, false );
+    }
+    else if ( aCommand.Name == "open" )
+    {
+
+        // open
+
+
+        ucb::OpenCommandArgument3 aOpenCommand;
+        ucb::OpenCommandArgument2 aTmp;
+        if ( !( aCommand.Argument >>= aTmp ) )
+        {
+            ucbhelper::cancelCommandExecution(
+                uno::Any( lang::IllegalArgumentException(
+                                    "Wrong argument type!",
+                                    static_cast< cppu::OWeakObject * >( this ),
+                                    -1 ) ),
+                Environment );
+            // Unreachable
+        }
+        if ( !( aCommand.Argument >>= aOpenCommand ) )
+        {
+            // compat mode, extract Arg2 info into newer structure
+            aOpenCommand.Mode = aTmp.Mode;
+            aOpenCommand.Priority = aTmp.Priority;
+            aOpenCommand.Sink = aTmp.Sink;
+            aOpenCommand.Properties = aTmp.Properties;
+            aOpenCommand.SortingInfo = aTmp.SortingInfo;
+        }
+
+        aRet = open( aOpenCommand, Environment );
+
+    }
+    else if ( aCommand.Name == "insert" )
+    {
+
+        // insert
+
+
+        ucb::InsertCommandArgument arg;
+        if ( !( aCommand.Argument >>= arg ) )
+        {
+            ucbhelper::cancelCommandExecution(
+                uno::Any( lang::IllegalArgumentException(
+                                    "Wrong argument type!",
+                                    static_cast< cppu::OWeakObject * >( this ),
+                                    -1 ) ),
+                Environment );
+            // Unreachable
+        }
+
+        insert( arg.Data, arg.ReplaceExisting, Environment );
+    }
+    else if ( aCommand.Name == "delete" )
+    {
+
+        // delete
+
+
+        bool bDeletePhysical = false;
+        aCommand.Argument >>= bDeletePhysical;
+
+//  KSO: Ignore parameter and destroy the content, if you don't support
+//       putting objects into trashcan. ( Since we do not have a trash can
+//       service yet (src603), you actually have no other choice. )
+//      if ( bDeletePhysical )
+//  {
+        try
+        {
+            std::unique_ptr< DAVResourceAccess > xResAccess;
+            {
+                osl::Guard< osl::Mutex > aGuard( m_aMutex );
+                xResAccess.reset( new DAVResourceAccess( *m_xResAccess ) );
+            }
+            aStaticDAVOptionsCache.removeDAVOptions( xResAccess->getURL() );
+            // clean cached value of PROPFIND property names
+            removeCachedPropertyNames( xResAccess->getURL() );
+            xResAccess->DESTROY( Environment );
+            {
+                osl::Guard< osl::Mutex > aGuard( m_aMutex );
+                m_xResAccess.reset( new DAVResourceAccess( *xResAccess ) );
+            }
+        }
+        catch ( DAVException const & e )
+        {
+            cancelCommandExecution( e, Environment, true );
+            // Unreachable
+        }
+//      }
+
+        // Propagate destruction.
+        destroy( bDeletePhysical );
+
+        // Remove own and all children's Additional Core Properties.
+        removeAdditionalPropertySet();
+    }
+    else if ( aCommand.Name == "transfer" && isFolder( Environment ) )
+    {
+
+        // transfer
+        //  ( Not available at documents )
+
+
+        ucb::TransferInfo transferArgs;
+        if ( !( aCommand.Argument >>= transferArgs ) )
+        {
+            ucbhelper::cancelCommandExecution(
+                uno::Any( lang::IllegalArgumentException(
+                                  "Wrong argument type!",
+                                  static_cast< cppu::OWeakObject * >( this ),
+                                  -1 ) ),
+                Environment );
+            // Unreachable
+        }
+
+        transfer( transferArgs, Environment );
+    }
+    else if ( aCommand.Name == "post" )
+    {
+
+        // post
+
+
+        ucb::PostCommandArgument2 aArg;
+        if ( !( aCommand.Argument >>= aArg ) )
+        {
+            ucbhelper::cancelCommandExecution(
+                uno::Any( lang::IllegalArgumentException(
+                                    "Wrong argument type!",
+                                    static_cast< cppu::OWeakObject * >( this ),
+                                    -1 ) ),
+                Environment );
+            // Unreachable
+        }
+
+        post( aArg, Environment );
+    }
+    else if ( aCommand.Name == "lock" )
+    {
+
+        // lock
+
+        ResourceType eType = resourceTypeForLocks( Environment );
+        // when the resource is not yet present the lock is used to create it
+        // see: http://tools.ietf.org/html/rfc4918#section-7.3
+        // If the resource doesn't exists and the lock is not enabled (DAV with
+        // no lock or a simple web) the error will be dealt with inside lock() method
+        if ( eType == NOT_FOUND ||
+            eType == DAV )
+        {
+            lock( Environment );
+            if ( eType == NOT_FOUND )
+            {
+                m_eResourceType = UNKNOWN;  // lock may have created it, need to check again
+                m_eResourceTypeForLocks = UNKNOWN;
+            }
+        }
+    }
+    else if ( aCommand.Name == "unlock" )
+    {
+
+        // unlock
+        // do not check for a DAV resource
+        // the lock store will be checked before sending
+        unlock( Environment );
+    }
+    else if ( aCommand.Name == "createNewContent" &&
+              isFolder( Environment ) )
+    {
+
+        // createNewContent
+
+
+        ucb::ContentInfo aArg;
+        if ( !( aCommand.Argument >>= aArg ) )
+        {
+            ucbhelper::cancelCommandExecution(
+                uno::Any( lang::IllegalArgumentException(
+                                    "Wrong argument type!",
+                                    static_cast< cppu::OWeakObject * >( this ),
+                                    -1 ) ),
+                Environment );
+            // Unreachable
+        }
+
+        aRet <<= createNewContent( aArg );
+    }
+    else if ( aCommand.Name == "addProperty" )
+    {
+        ucb::PropertyCommandArgument aPropArg;
+        if ( !( aCommand.Argument >>= aPropArg ))
+        {
+            ucbhelper::cancelCommandExecution(
+                uno::Any( lang::IllegalArgumentException(
+                                    "Wrong argument type!",
+                                    static_cast< cppu::OWeakObject * >( this ),
+                                    -1 ) ),
+                Environment );
+        }
+
+        // TODO when/if XPropertyContainer is removed,
+        // the command execution can be canceled in addProperty
+        try
+        {
+            addProperty( aPropArg, Environment );
+        }
+        catch ( const beans::PropertyExistException &e )
+        {
+            ucbhelper::cancelCommandExecution( uno::Any( e ), Environment );
+        }
+        catch ( const beans::IllegalTypeException&e )
+        {
+            ucbhelper::cancelCommandExecution( uno::Any( e ), Environment );
+        }
+        catch ( const lang::IllegalArgumentException&e )
+        {
+            ucbhelper::cancelCommandExecution( uno::Any( e ), Environment );
+        }
+    }
+    else if ( aCommand.Name == "removeProperty" )
+    {
+        OUString sPropName;
+        if ( !( aCommand.Argument >>= sPropName ) )
+        {
+            ucbhelper::cancelCommandExecution(
+                uno::Any( lang::IllegalArgumentException(
+                                    "Wrong argument type!",
+                                    static_cast< cppu::OWeakObject * >( this ),
+                                    -1 ) ),
+                Environment );
+        }
+
+        // TODO when/if XPropertyContainer is removed,
+        // the command execution can be canceled in removeProperty
+        try
+        {
+            removeProperty( sPropName, Environment );
+        }
+        catch( const beans::UnknownPropertyException &e )
+        {
+            ucbhelper::cancelCommandExecution( uno::Any( e ), Environment );
+        }
+        catch( const beans::NotRemoveableException &e )
+        {
+            ucbhelper::cancelCommandExecution( uno::Any( e ), Environment );
+        }
+    }
+    else
+    {
+
+        // Unsupported command
+
+
+        ucbhelper::cancelCommandExecution(
+            uno::Any( ucb::UnsupportedCommandException(
+                              aCommand.Name,
+                              static_cast< cppu::OWeakObject * >( this ) ) ),
+            Environment );
+        // Unreachable
+    }
+
+    SAL_INFO("ucb.ucp.webdav",  "<<<<< Content::execute: end: command: " << aCommand.Name);
+
+    return aRet;
+}
+
+
+// virtual
+void SAL_CALL Content::abort( sal_Int32 /*CommandId*/ )
+{
+    try
+    {
+        std::unique_ptr< DAVResourceAccess > xResAccess;
+        {
+            osl::MutexGuard aGuard( m_aMutex );
+            xResAccess.reset( new DAVResourceAccess( *m_xResAccess ) );
+        }
+        xResAccess->abort();
+        {
+            osl::Guard< osl::Mutex > aGuard( m_aMutex );
+            m_xResAccess.reset( new DAVResourceAccess( *xResAccess ) );
+        }
+    }
+    catch ( DAVException const & )
+    {
+        // abort failed!
+    }
+}
+
+
+// XPropertyContainer methods.
+
+
+void Content::addProperty( const css::ucb::PropertyCommandArgument &aCmdArg,
+                           const uno::Reference< ucb::XCommandEnvironment >& xEnv  )
+{
+//    if ( m_bTransient )
+//   @@@ ???
+    const beans::Property aProperty = aCmdArg.Property;
+    const uno::Any aDefaultValue = aCmdArg.DefaultValue;
+
+    // check property Name
+    if ( !aProperty.Name.getLength() )
+        throw lang::IllegalArgumentException(
+            "\"addProperty\" with empty Property.Name",
+            static_cast< ::cppu::OWeakObject * >( this ),
+            -1 );
+
+    // Check property type.
+    if ( !UCBDeadPropertyValue::supportsType( aProperty.Type ) )
+        throw beans::IllegalTypeException(
+            "\"addProperty\" unsupported Property.Type",
+            static_cast< ::cppu::OWeakObject * >( this ) );
+
+    // check default value
+    if ( aDefaultValue.hasValue() && aDefaultValue.getValueType() != aProperty.Type )
+        throw beans::IllegalTypeException(
+            "\"addProperty\" DefaultValue does not match Property.Type",
+            static_cast< ::cppu::OWeakObject * >( this ) );
+
+
+    // Make sure a property with the requested name does not already
+    // exist in dynamic and static(!) properties.
+
+
+    // Take into account special properties with custom namespace
+    // using <prop:the_propname xmlns:prop="the_namespace">
+    OUString aSpecialName;
+    bool bIsSpecial = DAVProperties::isUCBSpecialProperty( aProperty.Name, aSpecialName );
+
+    // Note: This requires network access!
+    if ( getPropertySetInfo( xEnv, false /* don't cache data */ )
+            ->hasPropertyByName( bIsSpecial ? aSpecialName : aProperty.Name ) )
+    {
+        // Property does already exist.
+        throw beans::PropertyExistException();
+    }
+
+
+    // Add a new dynamic property.
+
+
+    ProppatchValue aValue( PROPSET, aProperty.Name, aDefaultValue );
+
+    std::vector< ProppatchValue > aProppatchValues;
+    aProppatchValues.push_back( aValue );
+
+    try
+    {
+        // Set property value at server.
+        std::unique_ptr< DAVResourceAccess > xResAccess;
+        {
+            osl::Guard< osl::Mutex > aGuard( m_aMutex );
+            xResAccess.reset( new DAVResourceAccess( *m_xResAccess ) );
+        }
+        aStaticDAVOptionsCache.removeDAVOptions( xResAccess->getURL() );
+        // clean cached value of PROPFIND property names
+        // PROPPATCH can change them
+        removeCachedPropertyNames( xResAccess->getURL() );
+        xResAccess->PROPPATCH( aProppatchValues, xEnv );
+        {
+            osl::Guard< osl::Mutex > aGuard( m_aMutex );
+            m_xResAccess.reset( new DAVResourceAccess( *xResAccess ) );
+        }
+
+        // Notify propertyset info change listeners.
+        beans::PropertySetInfoChangeEvent evt(
+            static_cast< cppu::OWeakObject * >( this ),
+            bIsSpecial ? aSpecialName : aProperty.Name,
+            -1, // No handle available
+            beans::PropertySetInfoChange::PROPERTY_INSERTED );
+        notifyPropertySetInfoChange( evt );
+    }
+    catch ( DAVException const & e )
+    {
+        if ( e.getStatus() == SC_FORBIDDEN )
+        {
+            // Support for setting arbitrary dead properties is optional!
+
+            // Store property locally.
+            ContentImplHelper::addProperty( bIsSpecial ? aSpecialName : aProperty.Name,
+                                            aProperty.Attributes,
+                                            aDefaultValue );
+        }
+        else
+        {
+            if ( shouldAccessNetworkAfterException( e ) )
+            {
+                try
+                {
+                    const ResourceType eType = getResourceType( xEnv );
+                    switch ( eType )
+                    {
+                    case UNKNOWN:
+                    case DAV:
+                        throw lang::IllegalArgumentException();
+
+                    case NON_DAV:
+                        // Store property locally.
+                        ContentImplHelper::addProperty( bIsSpecial ? aSpecialName : aProperty.Name,
+                                                        aProperty.Attributes,
+                                                        aDefaultValue );
+                        break;
+
+                    default:
+                        SAL_WARN( "ucb.ucp.webdav",
+                                    "Content::addProperty - "
+                                    "Unsupported resource type!" );
+                        break;
+                    }
+                }
+                catch ( uno::Exception const & )
+                {
+                    SAL_WARN( "ucb.ucp.webdav",
+                                "Content::addProperty - "
+                                "Unable to determine resource type!" );
+                }
+            }
+            else
+            {
+                SAL_WARN( "ucb.ucp.webdav",
+                            "Content::addProperty - "
+                            "Unable to determine resource type!" );
+            }
+        }
+    }
+}
+
+void Content::removeProperty( const OUString& Name,
+                              const uno::Reference< ucb::XCommandEnvironment >& xEnv )
+{
+#if 0
+    // @@@ REMOVABLE at the moment not properly set in the PropSetInfo
+    try
+    {
+        beans::Property aProp
+        = getPropertySetInfo( xEnv, false /* don't cache data */ )
+          ->getPropertyByName( Name );
+
+        if ( !( aProp.Attributes & beans::PropertyAttribute::REMOVABLE ) )
+        {
+            // Not removable!
+            throw beans::NotRemoveableException();
+        }
+    }
+    catch ( beans::UnknownPropertyException const & )
+    {
+        //SAL_WARN( "ucb.ucp.webdav", "removeProperty - Unknown property!" );
+        throw;
+    }
+#endif
+
+    // Try to remove property from server.
+    try
+    {
+        std::vector< ProppatchValue > aProppatchValues;
+        ProppatchValue aValue( PROPREMOVE, Name, uno::Any() );
+        aProppatchValues.push_back( aValue );
+
+        // Remove property value from server.
+        std::unique_ptr< DAVResourceAccess > xResAccess;
+        {
+            osl::Guard< osl::Mutex > aGuard( m_aMutex );
+            xResAccess.reset( new DAVResourceAccess( *m_xResAccess ) );
+        }
+        aStaticDAVOptionsCache.removeDAVOptions( xResAccess->getURL() );
+        // clean cached value of PROPFIND property names
+        // PROPPATCH can change them
+        removeCachedPropertyNames( xResAccess->getURL() );
+        xResAccess->PROPPATCH( aProppatchValues, xEnv );
+        {
+            osl::Guard< osl::Mutex > aGuard( m_aMutex );
+            m_xResAccess.reset( new DAVResourceAccess( *xResAccess ) );
+        }
+
+        // Notify propertyset info change listeners.
+        beans::PropertySetInfoChangeEvent evt(
+            static_cast< cppu::OWeakObject * >( this ),
+            Name,
+            -1, // No handle available
+            beans::PropertySetInfoChange::PROPERTY_REMOVED );
+        notifyPropertySetInfoChange( evt );
+    }
+    catch ( DAVException const & e )
+    {
+        if ( e.getStatus() == SC_FORBIDDEN )
+        {
+            // Support for setting arbitrary dead properties is optional!
+
+            // Try to remove property from local store.
+            ContentImplHelper::removeProperty( Name );
+        }
+        else
+        {
+            if ( shouldAccessNetworkAfterException( e ) )
+            {
+                try
+                {
+                    const ResourceType eType = getResourceType( xEnv );
+                    switch ( eType )
+                    {
+                    case UNKNOWN:
+                    case DAV:
+                        throw beans::UnknownPropertyException(Name);
+
+                    case NON_DAV:
+                        // Try to remove property from local store.
+                        ContentImplHelper::removeProperty( Name );
+                        break;
+
+                    default:
+                        SAL_WARN( "ucb.ucp.webdav",
+                                    "Content::removeProperty - "
+                                    "Unsupported resource type!" );
+                        break;
+                    }
+                }
+                catch ( uno::Exception const & )
+                {
+                    SAL_WARN( "ucb.ucp.webdav",
+                                "Content::removeProperty - "
+                                "Unable to determine resource type!" );
+                }
+            }
+            else
+            {
+                SAL_WARN( "ucb.ucp.webdav",
+                            "Content::removeProperty - "
+                            "Unable to determine resource type!" );
+//                throw beans::UnknownPropertyException();
+            }
+        }
+    }
+}
+
+// virtual
+void SAL_CALL Content::addProperty( const OUString& Name,
+                                    sal_Int16 Attributes,
+                                    const uno::Any& DefaultValue )
+{
+    beans::Property aProperty;
+    aProperty.Name = Name;
+    aProperty.Type = DefaultValue.getValueType();
+    aProperty.Attributes = Attributes;
+    aProperty.Handle = -1;
+
+    addProperty( ucb::PropertyCommandArgument( aProperty, DefaultValue ),
+                 uno::Reference< ucb::XCommandEnvironment >());
+}
+
+// virtual
+void SAL_CALL Content::removeProperty( const OUString& Name )
+{
+    removeProperty( Name,
+                    uno::Reference< ucb::XCommandEnvironment >() );
+}
+
+
+// XContentCreator methods.
+
+
+// virtual
+uno::Sequence< ucb::ContentInfo > SAL_CALL
+Content::queryCreatableContentsInfo()
+{
+    osl::Guard< osl::Mutex > aGuard( m_aMutex );
+
+    uno::Sequence< ucb::ContentInfo > aSeq( 2 );
+
+    // document.
+    aSeq.getArray()[ 0 ].Type = WEBDAV_CONTENT_TYPE;
+    aSeq.getArray()[ 0 ].Attributes
+        = ucb::ContentInfoAttribute::INSERT_WITH_INPUTSTREAM
+          | ucb::ContentInfoAttribute::KIND_DOCUMENT;
+
+    beans::Property aProp;
+    m_pProvider->getProperty( "Title", aProp );
+
+    uno::Sequence< beans::Property > aDocProps( 1 );
+    aDocProps.getArray()[ 0 ] = aProp;
+    aSeq.getArray()[ 0 ].Properties = aDocProps;
+
+    // folder.
+    aSeq.getArray()[ 1 ].Type = WEBDAV_COLLECTION_TYPE;
+    aSeq.getArray()[ 1 ].Attributes
+        = ucb::ContentInfoAttribute::KIND_FOLDER;
+
+    uno::Sequence< beans::Property > aFolderProps( 1 );
+    aFolderProps.getArray()[ 0 ] = aProp;
+    aSeq.getArray()[ 1 ].Properties = aFolderProps;
+    return aSeq;
+}
+
+
+// virtual
+uno::Reference< ucb::XContent > SAL_CALL
+Content::createNewContent( const ucb::ContentInfo& Info )
+{
+    osl::Guard< osl::Mutex > aGuard( m_aMutex );
+
+    if ( !Info.Type.getLength() )
+        return uno::Reference< ucb::XContent >();
+
+    if ( ( Info.Type != WEBDAV_COLLECTION_TYPE )
+         &&
+         ( Info.Type != WEBDAV_CONTENT_TYPE ) )
+        return uno::Reference< ucb::XContent >();
+
+    OUString aURL = m_xIdentifier->getContentIdentifier();
+
+    SAL_WARN_IF( aURL.isEmpty(), "ucb.ucp.webdav",
+                "WebdavContent::createNewContent - empty identifier!" );
+
+    if ( ( aURL.lastIndexOf( '/' ) + 1 ) != aURL.getLength() )
+        aURL += "/";
+
+    bool isCollection;
+    if ( Info.Type == WEBDAV_COLLECTION_TYPE )
+    {
+        aURL += "New_Collection";
+        isCollection = true;
+    }
+    else
+    {
+        aURL += "New_Content";
+        isCollection = false;
+    }
+
+    uno::Reference< ucb::XContentIdentifier > xId(
+                    new ::ucbhelper::ContentIdentifier( aURL ) );
+
+    // create the local content
+    try
+    {
+        return new ::http_dav_ucp::Content( m_xContext,
+                                          m_pProvider,
+                                          xId,
+                                          m_xResAccess->getSessionFactory(),
+                                          isCollection );
+    }
+    catch ( ucb::ContentCreationException & )
+    {
+        return uno::Reference< ucb::XContent >();
+    }
+}
+
+
+// virtual
+OUString Content::getParentURL()
+{
+    // <scheme>://              -> ""
+    // <scheme>://foo           -> ""
+    // <scheme>://foo/          -> ""
+    // <scheme>://foo/bar       -> <scheme>://foo/
+    // <scheme>://foo/bar/      -> <scheme>://foo/
+    // <scheme>://foo/bar/abc   -> <scheme>://foo/bar/
+
+    OUString aURL = m_xIdentifier->getContentIdentifier();
+
+    sal_Int32 nPos = aURL.lastIndexOf( '/' );
+    if ( nPos == ( aURL.getLength() - 1 ) )
+    {
+        // Trailing slash found. Skip.
+        nPos = aURL.lastIndexOf( '/', nPos );
+    }
+
+    sal_Int32 nPos1 = aURL.lastIndexOf( '/', nPos );
+    if ( nPos1 != -1 )
+        nPos1 = aURL.lastIndexOf( '/', nPos1 );
+
+    if ( nPos1 == -1 )
+        return OUString();
+
+    return aURL.copy( 0, nPos + 1 );
+}
+
+
+// Non-interface methods.
+
+
+// static
+uno::Reference< sdbc::XRow > Content::getPropertyValues(
+    const uno::Reference< uno::XComponentContext >& rxContext,
+    const uno::Sequence< beans::Property >& rProperties,
+    const ContentProperties& rData,
+    const rtl::Reference< ::ucbhelper::ContentProviderImplHelper >& rProvider,
+    const OUString& rContentId )
+{
+    // Note: Empty sequence means "get values of all supported properties".
+
+    rtl::Reference< ::ucbhelper::PropertyValueSet > xRow
+        = new ::ucbhelper::PropertyValueSet( rxContext );
+
+    sal_Int32 nCount = rProperties.getLength();
+    if ( nCount )
+    {
+        uno::Reference< beans::XPropertySet > xAdditionalPropSet;
+        bool bTriedToGetAdditionalPropSet = false;
+
+        const beans::Property* pProps = rProperties.getConstArray();
+        for ( sal_Int32 n = 0; n < nCount; ++n )
+        {
+            const beans::Property& rProp = pProps[ n ];
+
+            // Process standard UCB, DAV and HTTP properties.
+            const uno::Any & rValue = rData.getValue( rProp.Name );
+            if ( rValue.hasValue() )
+            {
+                xRow->appendObject( rProp, rValue );
+            }
+            else
+            {
+                // Process local Additional Properties.
+                if ( !bTriedToGetAdditionalPropSet && !xAdditionalPropSet.is() )
+                {
+                    xAdditionalPropSet =
+                            rProvider->getAdditionalPropertySet( rContentId,
+                                                                 false );
+                    bTriedToGetAdditionalPropSet = true;
+                }
+
+                if ( !xAdditionalPropSet.is() ||
+                     !xRow->appendPropertySetValue(
+                                            xAdditionalPropSet, rProp ) )
+                {
+                    // Append empty entry.
+                    xRow->appendVoid( rProp );
+                }
+            }
+        }
+    }
+    else
+    {
+        // Append all standard UCB, DAV and HTTP properties.
+
+        const std::unique_ptr< PropertyValueMap > & xProps = rData.getProperties();
+
+        ContentProvider * pProvider
+            = static_cast< ContentProvider * >( rProvider.get() );
+        beans::Property aProp;
+
+        for ( const auto& rProp : *xProps )
+        {
+            if ( pProvider->getProperty( rProp.first, aProp ) )
+                xRow->appendObject( aProp, rProp.second.value() );
+        }
+
+        // Append all local Additional Properties.
+        uno::Reference< beans::XPropertySet > xSet =
+            rProvider->getAdditionalPropertySet( rContentId, false );
+        xRow->appendPropertySet( xSet );
+    }
+
+    return uno::Reference<sdbc::XRow>(xRow);
+}
+
+namespace {
+void GetPropsUsingHeadRequest(DAVResource& resource,
+                              const std::unique_ptr< DAVResourceAccess >& xResAccess,
+                              const std::vector< OUString >& aHTTPNames,
+                              const uno::Reference< ucb::XCommandEnvironment >& xEnv)
+{
+    if (!aHTTPNames.empty())
+    {
+        DAVOptions aDAVOptions;
+        OUString   aTargetURL = xResAccess->getURL();
+        // retrieve the cached options if any
+        aStaticDAVOptionsCache.getDAVOptions(aTargetURL, aDAVOptions);
+
+        // clean cached value of PROPFIND property names
+        // PROPPATCH can change them
+        Content::removeCachedPropertyNames(aTargetURL);
+        // test if HEAD allowed, if not, throw, should be caught immediately
+        // SC_GONE used internally by us, see comment in Content::getPropertyValues
+        // in the catch scope
+        if (aDAVOptions.getHttpResponseStatusCode() != SC_GONE &&
+            !aDAVOptions.isHeadAllowed())
+        {
+            throw DAVException(DAVException::DAV_HTTP_ERROR, "405 Not Implemented", SC_METHOD_NOT_ALLOWED);
+        }
+        // if HEAD is enabled on this site
+        // check if there is a relevant HTTP response status code cached
+        if (aDAVOptions.getHttpResponseStatusCode() != SC_NONE)
+        {
+            // throws exception as if there was a server error, a DAV exception
+            throw DAVException(DAVException::DAV_HTTP_ERROR,
+                aDAVOptions.getHttpResponseStatusText(),
+                aDAVOptions.getHttpResponseStatusCode());
+            // Unreachable
+        }
+
+        xResAccess->HEAD(aHTTPNames, resource, xEnv);
+    }
+}
+}
+
+uno::Reference< sdbc::XRow > Content::getPropertyValues(
+                const uno::Sequence< beans::Property >& rProperties,
+                const uno::Reference< ucb::XCommandEnvironment >& xEnv )
+{
+    std::unique_ptr< ContentProperties > xProps;
+    std::unique_ptr< ContentProperties > xCachedProps;
+    std::unique_ptr< DAVResourceAccess > xResAccess;
+    OUString aUnescapedTitle;
+    bool bHasAll = false;
+    uno::Reference< uno::XComponentContext > xContext;
+    uno::Reference< ucb::XContentIdentifier > xIdentifier;
+    rtl::Reference< ::ucbhelper::ContentProviderImplHelper > xProvider;
+
+    {
+        osl::Guard< osl::Mutex > aGuard( m_aMutex );
+
+        aUnescapedTitle = DecodeURI(m_aEscapedTitle);
+        xContext.set( m_xContext );
+        xIdentifier.set( m_xIdentifier );
+        xProvider = m_xProvider;
+        xResAccess.reset( new DAVResourceAccess( *m_xResAccess ) );
+
+        // First, ask cache...
+        if (m_xCachedProps)
+        {
+            xCachedProps.reset( new ContentProperties( *m_xCachedProps ) );
+
+            std::vector< OUString > aMissingProps;
+            if ( xCachedProps->containsAllNames( rProperties, aMissingProps ) )
+            {
+                // All properties are already in cache! No server access needed.
+                bHasAll = true;
+            }
+
+            // use the cached ContentProperties instance
+            xProps.reset( new ContentProperties( *xCachedProps ) );
+        }
+    }
+
+    bool bNetworkAccessAllowed = true;
+
+    if ( !m_bTransient && !bHasAll )
+    {
+        // Obtain values from server...
+
+
+        // First, identify whether resource is DAV or not
+        const ResourceType eType = getResourceType(
+                xEnv, xResAccess, &bNetworkAccessAllowed );
+
+        if ( eType == DAV )
+        {
+            // cache lookup... getResourceType may fill the props cache via
+            // PROPFIND!
+            if (m_xCachedProps)
+            {
+                xCachedProps.reset(
+                    new ContentProperties( *m_xCachedProps ) );
+
+                std::vector< OUString > aMissingProps;
+                if ( xCachedProps->containsAllNames(
+                         rProperties, aMissingProps ) )
+                {
+                    // All properties are already in cache! No server access
+                    // needed.
+                    bHasAll = true;
+                }
+
+                // use the cached ContentProperties instance
+                xProps.reset( new ContentProperties( *xCachedProps ) );
+            }
+
+            if ( !bHasAll )
+            {
+                // Only DAV resources support PROPFIND
+                std::vector< OUString > aPropNames;
+
+                uno::Sequence< beans::Property > aProperties(rProperties);
+
+                if ( aProperties.getLength() > 0 )
+                    ContentProperties::UCBNamesToDAVNames(
+                        aProperties, aPropNames );
+
+                if ( !aPropNames.empty() )
+                {
+                    std::vector< DAVResource > resources;
+                    try
+                    {
+                        xResAccess->PROPFIND(
+                            DAVZERO, aPropNames, resources, xEnv );
+
+                        if ( 1 == resources.size() )
+                        {
+#if defined SAL_LOG_INFO
+                            {//debug
+                                // print received resources
+                                std::vector< DAVPropertyValue >::const_iterator it = resources[0].properties.begin();
+                                std::vector< DAVPropertyValue >::const_iterator end = resources[0].properties.end();
+                                while ( it != end )
+                                {
+                                    OUString aPropValue;
+                                    bool    bValue;
+                                    uno::Sequence< ucb::LockEntry > aSupportedLocks;
+                                    if( (*it).Value >>= aPropValue )
+                                        SAL_INFO( "ucb.ucp.webdav", "PROPFIND (getPropertyValues) - returned property: " << (*it).Name << ":" << aPropValue );
+                                    else if( (*it).Value >>= bValue )
+                                        SAL_INFO( "ucb.ucp.webdav", "PROPFIND (getPropertyValues) - returned property: " << (*it).Name << ":" <<
+                                                  ( bValue ? "true" : "false" ) );
+                                    else if( (*it).Value >>= aSupportedLocks )
+                                    {
+                                        SAL_INFO( "ucb.ucp.webdav", "PROPFIND (getPropertyValues) - returned property: " << (*it).Name << ":" );
+                                        for ( sal_Int32 n = 0; n < aSupportedLocks.getLength(); ++n )
+                                        {
+                                            SAL_INFO( "ucb.ucp.webdav","      scope: "
+                                                      << (aSupportedLocks[n].Scope == ucb::LockScope_SHARED ? "shared" : "exclusive")
+                                                      << ", type: "
+                                                      << (aSupportedLocks[n].Type != ucb::LockType_WRITE ? "" : "write") );
+                                        }
+                                    }
+                                    ++it;
+                                }
+                            }
+#endif
+                            if (xProps)
+                                xProps->addProperties(
+                                    aPropNames,
+                                    ContentProperties( resources[ 0 ] ));
+                            else
+                                xProps.reset(
+                                    new ContentProperties( resources[ 0 ] ) );
+                        }
+                    }
+                    catch ( DAVException const & e )
+                    {
+                        bNetworkAccessAllowed = bNetworkAccessAllowed
+                            && shouldAccessNetworkAfterException( e );
+
+                        if ( !bNetworkAccessAllowed )
+                        {
+                            cancelCommandExecution( e, xEnv );
+                            // unreachable
+                        }
+                    }
+                }
+            }
+        }
+
+        if ( bNetworkAccessAllowed )
+        {
+            // All properties obtained already?
+            std::vector< OUString > aMissingProps;
+            if ( !( xProps
+                    && xProps->containsAllNames(rProperties, aMissingProps))
+                // i#121922 for non-DAV, uncacheable properties must be fetched
+                // regardless of m_bDidGetOrHead.
+                // But SharePoint may do weird things on HEAD so for DAV
+                // only do this if required.
+                && (eType != DAV || !m_bDidGetOrHead))
+            {
+                // Possibly the missing props can be obtained using a HEAD
+                // request.
+
+                std::vector< OUString > aHeaderNames;
+                ContentProperties::UCBNamesToHTTPNames(
+                    rProperties,
+                    aHeaderNames );
+
+                if( eType != DAV )
+                {
+                    // in case of not DAV PROFIND (previously in program flow) failed
+                    // so we need to add the only prop that's common
+                    // to DAV and NON_DAV: MediaType, that maps to Content-Type
+                    aHeaderNames.push_back( "Content-Type" );
+                }
+
+                if (!aHeaderNames.empty()) try
+                {
+                    DAVResource resource;
+                    GetPropsUsingHeadRequest(resource, xResAccess, aHeaderNames, xEnv);
+                    m_bDidGetOrHead = true;
+
+                    if (xProps)
+                        xProps->addProperties(
+                            aMissingProps,
+                            ContentProperties( resource ) );
+                    else
+                        xProps.reset ( new ContentProperties( resource ) );
+
+                    if (m_eResourceType == NON_DAV)
+                        xProps->addProperties(aMissingProps,
+                            ContentProperties(
+                                aUnescapedTitle,
+                                false));
+                }
+                catch ( DAVException const & e )
+                {
+                    // non "general-purpose servers" may not support HEAD requests
+                    // see http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1.1
+                    // In this case, perform a partial GET only to get the header info
+                    // vid. http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35
+                    // WARNING if the server does not support partial GETs,
+                    // the GET will transfer the whole content
+                    bool bError = true;
+                    DAVException aLastException = e;
+                    OUString aTargetURL = xResAccess->getURL();
+
+                    if ( e.getError() == DAVException::DAV_HTTP_ERROR )
+                    {
+                        // According to the spec. the origin server SHOULD return
+                        // * 405 (Method Not Allowed):
+                        //      the method is known but not allowed for the requested resource
+                        // * 501 (Not Implemented):
+                        //      the method is unrecognized or not implemented
+                        // * 404 (SC_NOT_FOUND)
+                        //      is for google-code server and for MS IIS 10.0 Web server
+                        //      when only GET is enabled
+                        if ( aLastException.getStatus() == SC_NOT_IMPLEMENTED ||
+                             aLastException.getStatus() == SC_METHOD_NOT_ALLOWED ||
+                             aLastException.getStatus() == SC_NOT_FOUND )
+                        {
+                            SAL_WARN( "ucb.ucp.webdav", "HEAD probably not implemented: fall back to a partial GET" );
+                            aStaticDAVOptionsCache.setHeadAllowed( aTargetURL, false );
+                            lcl_sendPartialGETRequest( bError,
+                                                       aLastException,
+                                                       aMissingProps,
+                                                       aHeaderNames,
+                                                       xResAccess,
+                                                       xProps,
+                                                       xEnv );
+                            m_bDidGetOrHead = !bError;
+                        }
+                    }
+
+                    if ( bError )
+                    {
+                        DAVOptions aDAVOptionsException;
+
+                        aDAVOptionsException.setURL( aTargetURL );
+                        // check if the error was SC_NOT_FOUND, meaning that the
+                        // GET fall back didn't succeeded and the element is really missing
+                        // we will consider the resource SC_GONE (410) for some time
+                        // we use SC_GONE because has the same meaning of SC_NOT_FOUND (404)
+                        // see:
+                        // <https://tools.ietf.org/html/rfc7231#section-6.5.9> (retrieved 2016-10-09)
+                        // apparently it's not used to mark the missing HEAD method (so far...)
+                        sal_uInt16 ResponseStatusCode =
+                            ( aLastException.getStatus() == SC_NOT_FOUND ) ?
+                            SC_GONE :
+                            aLastException.getStatus();
+                        aDAVOptionsException.setHttpResponseStatusCode( ResponseStatusCode );
+                        aDAVOptionsException.setHttpResponseStatusText( aLastException.getData() );
+                        aStaticDAVOptionsCache.addDAVOptions( aDAVOptionsException,
+                                                              m_nOptsCacheLifeNotFound );
+
+                        if ( !shouldAccessNetworkAfterException( aLastException ) )
+                        {
+                            cancelCommandExecution( aLastException, xEnv );
+                            // unreachable
+                        }
+                    }
+                }
+            }
+        }
+
+        // might trigger HTTP redirect.
+        // Therefore, title must be updated here.
+        CurlUri const aUri( xResAccess->getURL() );
+        aUnescapedTitle = aUri.GetPathBaseNameUnescaped();
+
+        if ( eType == UNKNOWN )
+        {
+            xProps.reset( new ContentProperties( aUnescapedTitle ) );
+        }
+
+        // For DAV resources we only know the Title, for non-DAV
+        // resources we additionally know that it is a document.
+
+        else if ( eType == DAV )
+        {
+            if (!xProps)
+                xProps.reset(new ContentProperties(aUnescapedTitle));
+            else
+                xProps->addProperty("Title", uno::Any(aUnescapedTitle), true);
+        }
+        else
+        {
+            if (!xProps)
+                xProps.reset( new ContentProperties( aUnescapedTitle, false ) );
+            else
+                xProps->addProperty(
+                    "Title",
+                    uno::Any( aUnescapedTitle ),
+                    true );
+
+            xProps->addProperty(
+                "IsFolder",
+                uno::Any( false ),
+                true );
+            xProps->addProperty(
+                "IsDocument",
+                uno::Any( true ),
+                true );
+            xProps->addProperty(
+                "ContentType",
+                uno::Any( OUString(WEBDAV_CONTENT_TYPE) ),
+                true );
+        }
+    }
+    else
+    {
+        // No server access for just created (not yet committed) objects.
+        // Only a minimal set of properties supported at this stage.
+        if (m_bTransient)
+            xProps.reset( new ContentProperties( aUnescapedTitle,
+                                                 m_bCollection ) );
+    }
+
+    // Add a default for the properties requested but not found.
+    // Determine still missing properties, add a default.
+    // Some client function doesn't expect a void uno::Any,
+    // but instead wants some sort of default.
+    std::vector< OUString > aMissingProps;
+    if ( !xProps->containsAllNames(
+                rProperties, aMissingProps ) )
+    {
+        //
+        for ( std::vector< rtl::OUString >::const_iterator it = aMissingProps.begin();
+              it != aMissingProps.end(); ++it )
+        {
+            // For the time being only a couple of properties need to be added
+            if ( (*it) == "DateModified"  || (*it) == "DateCreated" )
+            {
+                util::DateTime aDate;
+                xProps->addProperty(
+                    (*it),
+                    uno::Any( aDate ),
+                    true );
+            }
+            else if (bNetworkAccessAllowed) // don't set these if connection failed
+            {
+                // If WebDAV didn't return the resource type, assume default
+                // This happens e.g. for lists exported by SharePoint
+                if ((*it) == "IsFolder")
+                {
+                    xProps->addProperty(
+                        (*it),
+                        uno::Any( false ),
+                        true );
+                }
+                else if ((*it) == "IsDocument")
+                {
+                    xProps->addProperty(
+                        (*it),
+                        uno::Any( true ),
+                        true );
+                }
+            }
+        }
+    }
+
+    sal_Int32 nCount = rProperties.getLength();
+    for ( sal_Int32 n = 0; n < nCount; ++n )
+    {
+        const OUString rName = rProperties[ n ].Name;
+        if ( rName == "BaseURI" )
+        {
+            // Add BaseURI property, if requested.
+            xProps->addProperty(
+                 "BaseURI",
+                 uno::Any( getBaseURI( xResAccess ) ),
+                 true );
+        }
+        else if ( rName == "CreatableContentsInfo" )
+        {
+            // Add CreatableContentsInfo property, if requested.
+            bool bFolder = false;
+            xProps->getValue( "IsFolder" )
+                    >>= bFolder;
+            xProps->addProperty(
+                "CreatableContentsInfo",
+                uno::Any( bFolder
+                                  ? queryCreatableContentsInfo()
+                                  : uno::Sequence< ucb::ContentInfo >() ),
+                true );
+        }
+    }
+
+    uno::Reference< sdbc::XRow > xResultRow
+        = getPropertyValues( xContext,
+                             rProperties,
+                             *xProps,
+                             xProvider,
+                             xIdentifier->getContentIdentifier() );
+
+    {
+        osl::Guard< osl::Mutex > aGuard( m_aMutex );
+
+        if (!m_xCachedProps)
+            m_xCachedProps.reset( new CachableContentProperties( *xProps ) );
+        else
+            m_xCachedProps->addProperties( *xProps );
+
+        m_xResAccess.reset( new DAVResourceAccess( *xResAccess ) );
+        m_aEscapedTitle = EncodeSegment(aUnescapedTitle);
+    }
+
+    return xResultRow;
+}
+
+
+uno::Sequence< uno::Any > Content::setPropertyValues(
+                const uno::Sequence< beans::PropertyValue >& rValues,
+                const uno::Reference< ucb::XCommandEnvironment >& xEnv )
+{
+    uno::Reference< ucb::XContentIdentifier >    xIdentifier;
+    rtl::Reference< ContentProvider >            xProvider;
+    bool bTransient;
+    std::unique_ptr< DAVResourceAccess > xResAccess;
+
+    {
+        osl::Guard< osl::Mutex > aGuard( m_aMutex );
+
+        xProvider.set( m_pProvider );
+        xIdentifier.set( m_xIdentifier );
+        bTransient = m_bTransient;
+        xResAccess.reset( new DAVResourceAccess( *m_xResAccess ) );
+    }
+
+    uno::Sequence< uno::Any > aRet( rValues.getLength() );
+    auto aRetRange = asNonConstRange(aRet);
+    uno::Sequence< beans::PropertyChangeEvent > aChanges( rValues.getLength() );
+    sal_Int32 nChanged = 0;
+
+    beans::PropertyChangeEvent aEvent;
+    aEvent.Source         = static_cast< cppu::OWeakObject * >( this );
+    aEvent.Further        = false;
+    // aEvent.PropertyName =
+    aEvent.PropertyHandle = -1;
+    // aEvent.OldValue   =
+    // aEvent.NewValue   =
+
+    std::vector< ProppatchValue > aProppatchValues;
+    std::vector< sal_Int32 > aProppatchPropsPositions;
+
+    uno::Reference< ucb::XPersistentPropertySet > xAdditionalPropSet;
+    bool bTriedToGetAdditionalPropSet = false;
+
+    bool bExchange = false;
+    OUString aNewTitle;
+    OUString aOldTitle;
+    sal_Int32 nTitlePos = -1;
+
+    uno::Reference< beans::XPropertySetInfo > xInfo;
+
+    const beans::PropertyValue* pValues = rValues.getConstArray();
+    sal_Int32 nCount = rValues.getLength();
+    for ( sal_Int32 n = 0; n < nCount; ++n )
+    {
+        const beans::PropertyValue& rValue = pValues[ n ];
+        const OUString & rName = rValue.Name;
+
+        beans::Property aTmpProp;
+        xProvider->getProperty( rName, aTmpProp );
+
+        if ( aTmpProp.Attributes & beans::PropertyAttribute::READONLY )
+        {
+            // Read-only property!
+            aRetRange[ n ] <<= lang::IllegalAccessException(
+                            "Property is read-only!",
+                            static_cast< cppu::OWeakObject * >( this ) );
+            continue;
+        }
+
+
+        // Mandatory props.
+
+
+        if ( rName == "ContentType" )
+        {
+            // Read-only property!
+            aRetRange[ n ] <<= lang::IllegalAccessException(
+                "Property is read-only!",
+                static_cast< cppu::OWeakObject * >( this ) );
+        }
+        else if ( rName == "IsDocument" )
+        {
+            // Read-only property!
+            aRetRange[ n ] <<= lang::IllegalAccessException(
+                "Property is read-only!",
+                static_cast< cppu::OWeakObject * >( this ) );
+        }
+        else if ( rName == "IsFolder" )
+        {
+            // Read-only property!
+            aRetRange[ n ] <<= lang::IllegalAccessException(
+                            "Property is read-only!",
+                            static_cast< cppu::OWeakObject * >( this ) );
+        }
+        else if ( rName == "Title" )
+        {
+            OUString aNewValue;
+            if ( rValue.Value >>= aNewValue )
+            {
+                // No empty titles!
+                if ( aNewValue.getLength() > 0 )
+                {
+                    try
+                    {
+                        CurlUri const aURI(xIdentifier->getContentIdentifier());
+                        aOldTitle = aURI.GetPathBaseNameUnescaped();
+
+                        if ( aNewValue != aOldTitle )
+                        {
+                            // modified title -> modified URL -> exchange !
+                            if ( !bTransient )
+                                bExchange = true;
+
+                            // new value will be set later...
+                            aNewTitle = aNewValue;
+
+                            // remember position within sequence of values (for
+                            // error handling).
+                            nTitlePos = n;
+                        }
+                    }
+                    catch ( DAVException const & )
+                    {
+                        aRetRange[ n ] <<= lang::IllegalArgumentException(
+                            "Invalid content identifier!",
+                            static_cast< cppu::OWeakObject * >( this ),
+                            -1 );
+                    }
+                }
+                else
+                {
+                    aRetRange[ n ] <<= lang::IllegalArgumentException(
+                        "Empty title not allowed!",
+                        static_cast< cppu::OWeakObject * >( this ),
+                        -1 );
+                }
+            }
+            else
+            {
+                aRetRange[ n ] <<= beans::IllegalTypeException(
+                    "Property value has wrong type!",
+                    static_cast< cppu::OWeakObject * >( this ) );
+            }
+        }
+        else
+        {
+
+            // Optional props.
+
+
+            OUString aSpecialName;
+            bool bIsSpecial = DAVProperties::isUCBSpecialProperty( rName, aSpecialName );
+
+            if ( !xInfo.is() )
+                xInfo = getPropertySetInfo( xEnv,
+                                            false /* don't cache data */ );
+
+            if ( !xInfo->hasPropertyByName( bIsSpecial ? aSpecialName : rName ) )
+            {
+                // Check, whether property exists. Skip otherwise.
+                // PROPPATCH::set would add the property automatically, which
+                // is not allowed for "setPropertyValues" command!
+                aRetRange[ n ] <<= beans::UnknownPropertyException(
+                                "Property is unknown!",
+                                static_cast< cppu::OWeakObject * >( this ) );
+                continue;
+            }
+
+            if ( rName == "Size" )
+            {
+                // Read-only property!
+                aRetRange[ n ] <<= lang::IllegalAccessException(
+                                "Property is read-only!",
+                                static_cast< cppu::OWeakObject * >( this ) );
+            }
+            else if ( rName == "DateCreated" )
+            {
+                // Read-only property!
+                aRetRange[ n ] <<= lang::IllegalAccessException(
+                                "Property is read-only!",
+                                static_cast< cppu::OWeakObject * >( this ) );
+            }
+            else if ( rName == "DateModified" )
+            {
+                // Read-only property!
+                aRetRange[ n ] <<= lang::IllegalAccessException(
+                                "Property is read-only!",
+                                static_cast< cppu::OWeakObject * >( this ) );
+            }
+            else if ( rName == "MediaType" )
+            {
+                // Read-only property!
+                // (but could be writable, if 'getcontenttype' would be)
+                aRetRange[ n ] <<= lang::IllegalAccessException(
+                                "Property is read-only!",
+                                static_cast< cppu::OWeakObject * >( this ) );
+            }
+            if ( rName == "CreatableContentsInfo" )
+            {
+                // Read-only property!
+                aRetRange[ n ] <<= lang::IllegalAccessException(
+                                "Property is read-only!",
+                                static_cast< cppu::OWeakObject * >( this ) );
+            }
+            else
+            {
+                if ( getResourceType( xEnv, xResAccess ) == DAV )
+                {
+                    // Property value will be set on server.
+                    ProppatchValue aValue( PROPSET, rName, rValue.Value );
+                    aProppatchValues.push_back( aValue );
+
+                    // remember position within sequence of values (for
+                    // error handling).
+                    aProppatchPropsPositions.push_back( n );
+                }
+                else
+                {
+                    // Property value will be stored in local property store.
+                    if ( !bTriedToGetAdditionalPropSet &&
+                         !xAdditionalPropSet.is() )
+                    {
+                        xAdditionalPropSet
+                            = getAdditionalPropertySet( false );
+                        bTriedToGetAdditionalPropSet = true;
+                    }
+
+                    if ( xAdditionalPropSet.is() )
+                    {
+                        try
+                        {
+                            uno::Any aOldValue
+                                = xAdditionalPropSet->getPropertyValue( rName );
+                            if ( aOldValue != rValue.Value )
+                            {
+                                xAdditionalPropSet->setPropertyValue(
+                                                        rName, rValue.Value );
+
+                                aEvent.PropertyName = rName;
+                                aEvent.OldValue     = aOldValue;
+                                aEvent.NewValue     = rValue.Value;
+
+                                aChanges.getArray()[ nChanged ] = aEvent;
+                                nChanged++;
+                            }
+                        }
+                        catch ( beans::UnknownPropertyException const & e )
+                        {
+                            aRetRange[ n ] <<= e;
+                        }
+                        catch ( lang::WrappedTargetException const & e )
+                        {
+                            aRetRange[ n ] <<= e;
+                        }
+                        catch ( beans::PropertyVetoException const & e )
+                        {
+                            aRetRange[ n ] <<= e;
+                        }
+                        catch ( lang::IllegalArgumentException const & e )
+                        {
+                            aRetRange[ n ] <<= e;
+                        }
+                    }
+                    else
+                    {
+                        aRetRange[ n ] <<= uno::Exception(
+                                "No property set for storing the value!",
+                                static_cast< cppu::OWeakObject * >( this ) );
+                    }
+                }
+            }
+        }
+    } // for
+
+    if ( !bTransient && (!aProppatchValues.empty()) )
+    {
+        try
+        {
+            // clean cached value of PROPFIND property names
+            // PROPPATCH can change them
+            removeCachedPropertyNames( xResAccess->getURL() );
+            // Set property values at server.
+            aStaticDAVOptionsCache.removeDAVOptions( xResAccess->getURL() );
+            xResAccess->PROPPATCH( aProppatchValues, xEnv );
+
+            for ( const auto& rProppatchValue : aProppatchValues )
+            {
+                aEvent.PropertyName = rProppatchValue.name;
+                aEvent.OldValue     = uno::Any(); // @@@ too expensive to obtain!
+                aEvent.NewValue     = rProppatchValue.value;
+
+                aChanges.getArray()[ nChanged ] = aEvent;
+                nChanged++;
+            }
+        }
+        catch ( DAVException const & e )
+        {
+//            SAL_WARN( "ucb.ucp.webdav",
+//                        "Content::setPropertyValues - PROPPATCH failed!" );
+
+#if 1
+            cancelCommandExecution( e, xEnv );
+            // unreachable
+#else
+            // Note: PROPPATCH either sets ALL property values OR NOTHING.
+
+            std::vector< sal_Int32 >::const_iterator it
+                = aProppatchPropsPositions.begin();
+            std::vector< sal_Int32 >::const_iterator end
+                = aProppatchPropsPositions.end();
+
+            while ( it != end )
+            {
+                // Set error.
+                aRetRange[ (*it) ] <<= MapDAVException( e, true );
+                ++it;
+            }
+#endif
+        }
+    }
+
+    if ( bExchange )
+    {
+        // Assemble new content identifier...
+
+        OUString aNewURL = getParentURL();
+        if ( aNewURL.lastIndexOf( '/' ) != ( aNewURL.getLength() - 1 ) )
+            aNewURL += "/";
+
+        aNewURL += EncodeSegment(aNewTitle);
+
+        uno::Reference< ucb::XContentIdentifier > xNewId
+            = new ::ucbhelper::ContentIdentifier( aNewURL );
+        uno::Reference< ucb::XContentIdentifier > xOldId = xIdentifier;
+
+        try
+        {
+            CurlUri const sourceURI( xOldId->getContentIdentifier() );
+            CurlUri targetURI( xNewId->getContentIdentifier() );
+
+            targetURI.SetScheme( sourceURI.GetScheme() );
+
+            // clean cached value of PROPFIND property names
+            removeCachedPropertyNames( sourceURI.GetURI() );
+            removeCachedPropertyNames( targetURI.GetURI() );
+            aStaticDAVOptionsCache.removeDAVOptions( sourceURI.GetURI() );
+            aStaticDAVOptionsCache.removeDAVOptions( targetURI.GetURI() );
+            xResAccess->MOVE(
+                sourceURI.GetRelativeReference(), targetURI.GetURI(), false, xEnv );
+
+            // @@@ Should check for resources that could not be moved
+            //     (due to source access or target overwrite) and send
+            //     this information through the interaction handler.
+
+            // @@@ Existing content should be checked to see if it needs
+            //     to be deleted at the source
+
+            // @@@ Existing content should be checked to see if it has
+            //     been overwritten at the target
+
+            if ( exchangeIdentity( xNewId ) )
+            {
+                xResAccess->setURL( aNewURL );
+
+// DAV resources store all additional props on server!
+//              // Adapt Additional Core Properties.
+//              renameAdditionalPropertySet( xOldId->getContentIdentifier(),
+//                                           xNewId->getContentIdentifier(),
+//                                           true );
+            }
+            else
+            {
+                // Do not set new title!
+                aNewTitle.clear();
+
+                // Set error .
+                aRetRange[ nTitlePos ] <<= uno::Exception(
+                    "Exchange failed!",
+                    static_cast< cppu::OWeakObject * >( this ) );
+            }
+        }
+        catch ( DAVException const & e )
+        {
+            // Do not set new title!
+            aNewTitle.clear();
+
+            // Set error .
+            aRetRange[ nTitlePos ] = MapDAVException( e, true );
+        }
+    }
+
+    if ( aNewTitle.getLength() )
+    {
+        osl::Guard< osl::Mutex > aGuard( m_aMutex );
+
+        aEvent.PropertyName = "Title";
+        aEvent.OldValue     <<= aOldTitle;
+        aEvent.NewValue     <<= aNewTitle;
+
+        m_aEscapedTitle     = EncodeSegment(aNewTitle);
+
+        aChanges.getArray()[ nChanged ] = aEvent;
+        nChanged++;
+    }
+
+    if ( nChanged > 0 )
+    {
+        aChanges.realloc( nChanged );
+        notifyPropertiesChange( aChanges );
+    }
+
+    {
+        osl::Guard< osl::Mutex > aGuard( m_aMutex );
+        m_xResAccess.reset( new DAVResourceAccess( *xResAccess ) );
+    }
+
+    return aRet;
+}
+
+
+uno::Any Content::open(
+                const ucb::OpenCommandArgument3 & rArg,
+                const uno::Reference< ucb::XCommandEnvironment > & xEnv )
+{
+    uno::Any aRet;
+
+    bool bOpenFolder = ( ( rArg.Mode == ucb::OpenMode::ALL ) ||
+                             ( rArg.Mode == ucb::OpenMode::FOLDERS ) ||
+                             ( rArg.Mode == ucb::OpenMode::DOCUMENTS ) );
+    if ( bOpenFolder )
+    {
+        if ( isFolder( xEnv ) )
+        {
+            // Open collection.
+
+            uno::Reference< ucb::XDynamicResultSet > xSet
+                = new DynamicResultSet( m_xContext, this, rArg, xEnv );
+            aRet <<= xSet;
+        }
+        else
+        {
+            // Error: Not a folder!
+
+            ucbhelper::cancelCommandExecution(
+                uno::Any(
+                    lang::IllegalArgumentException(
+                        "Non-folder resource cannot be opened as folder! Wrong Open Mode!",
+                        static_cast< cppu::OWeakObject * >( this ),
+                        -1 ) ),
+                xEnv );
+            // Unreachable
+        }
+    }
+
+    if ( rArg.Sink.is() )
+    {
+        // Open document.
+
+        if ( ( rArg.Mode == ucb::OpenMode::DOCUMENT_SHARE_DENY_NONE ) ||
+             ( rArg.Mode == ucb::OpenMode::DOCUMENT_SHARE_DENY_WRITE ) )
+        {
+            // Currently(?) unsupported.
+            ucbhelper::cancelCommandExecution(
+                uno::Any(
+                    ucb::UnsupportedOpenModeException(
+                            OUString(),
+                            static_cast< cppu::OWeakObject * >( this ),
+                            sal_Int16( rArg.Mode ) ) ),
+                xEnv );
+            // Unreachable
+        }
+
+        uno::Reference< io::XOutputStream > xOut( rArg.Sink, uno::UNO_QUERY );
+        if ( xOut.is() )
+        {
+            // PUSH: write data
+            try
+            {
+                std::unique_ptr< DAVResourceAccess > xResAccess;
+
+                {
+                    osl::MutexGuard aGuard( m_aMutex );
+
+                    xResAccess.reset(
+                        new DAVResourceAccess( *m_xResAccess ) );
+                }
+
+                xResAccess->setFlags( rArg.OpeningFlags );
+                DAVResource aResource;
+                std::vector< OUString > aHeaders;
+
+                removeCachedPropertyNames( xResAccess->getURL() );
+                xResAccess->GET( xOut, aHeaders, aResource, xEnv );
+                m_bDidGetOrHead = true;
+
+                {
+                    osl::MutexGuard aGuard( m_aMutex );
+
+                    // cache headers.
+                    if (!m_xCachedProps)
+                        m_xCachedProps.reset(
+                            new CachableContentProperties( ContentProperties( aResource ) ) );
+                    else
+                        m_xCachedProps->addProperties( ContentProperties( aResource ) );
+
+                    m_xResAccess.reset(
+                        new DAVResourceAccess( *xResAccess ) );
+                }
+            }
+            catch ( DAVException const & e )
+            {
+                cancelCommandExecution( e, xEnv );
+                // Unreachable
+            }
+        }
+        else
+        {
+            uno::Reference< io::XActiveDataSink > xDataSink( rArg.Sink, uno::UNO_QUERY );
+            if ( xDataSink.is() )
+            {
+                // PULL: wait for client read
+                OUString aTargetURL =  m_xIdentifier->getContentIdentifier();
+                try
+                {
+                    std::unique_ptr< DAVResourceAccess > xResAccess;
+                    {
+                        osl::MutexGuard aGuard( m_aMutex );
+
+                        xResAccess.reset(
+                            new DAVResourceAccess( *m_xResAccess ) );
+                    }
+                    xResAccess->setFlags( rArg.OpeningFlags );
+
+                    // fill inputstream sync; return if all data present
+                    DAVResource aResource;
+                    std::vector< OUString > aHeaders;
+
+                    aTargetURL = xResAccess->getURL();
+                    removeCachedPropertyNames( aTargetURL );
+                    // check if the resource was present on the server
+                    // first update it, if necessary
+                    // if the open is called directly, without the default open sequence,
+                    // e.g. the one used when opening a file looking for properties
+                    // first this call will have no effect, since OPTIONS would have already been called
+                    // as a consequence of getPropertyValues()
+                    DAVOptions aDAVOptions;
+                    getResourceOptions( xEnv, aDAVOptions, xResAccess );
+
+                    if (aDAVOptions.getHttpResponseStatusCode() != SC_NONE
+                        // tdf#148426 fall back to GET in case of 500
+                        && aDAVOptions.getHttpResponseStatusCode() != SC_INTERNAL_SERVER_ERROR)
+                    {
+                        // throws exception as if there was a server error, a DAV exception
+                        throw DAVException( DAVException::DAV_HTTP_ERROR,
+                                            aDAVOptions.getHttpResponseStatusText(),
+                                            aDAVOptions.getHttpResponseStatusCode() );
+                    }
+                    uno::Reference< io::XInputStream > xIn
+                        = xResAccess->GET( aHeaders, aResource, xEnv );
+                    m_bDidGetOrHead = true;
+
+                    {
+                        osl::MutexGuard aGuard( m_aMutex );
+
+                        // cache headers.
+                        if (!m_xCachedProps)
+                            m_xCachedProps.reset(
+                                new CachableContentProperties( ContentProperties( aResource ) ) );
+                        else
+                            m_xCachedProps->addProperties(
+                                aResource.properties );
+
+                        m_xResAccess.reset(
+                            new DAVResourceAccess( *xResAccess ) );
+                    }
+
+                    xDataSink->setInputStream( xIn );
+                }
+                catch ( DAVException const & e )
+                {
+                    //TODO cache the http error if not yet cached
+                    cancelCommandExecution( e, xEnv );
+                    // Unreachable
+                }
+            }
+            else
+            {
+                // Note: aOpenCommand.Sink may contain an XStream
+                //       implementation. Support for this type of
+                //       sink is optional...
+                ucbhelper::cancelCommandExecution(
+                    uno::Any(
+                        ucb::UnsupportedDataSinkException(
+                            OUString(),
+                            static_cast< cppu::OWeakObject * >( this ),
+                            rArg.Sink ) ),
+                    xEnv );
+                // Unreachable
+            }
+        }
+    }
+
+    return aRet;
+}
+
+
+void Content::post(
+                const ucb::PostCommandArgument2 & rArg,
+                const uno::Reference< ucb::XCommandEnvironment > & xEnv )
+{
+    uno::Reference< io::XActiveDataSink > xSink( rArg.Sink, uno::UNO_QUERY );
+    if ( xSink.is() )
+    {
+        try
+        {
+            std::unique_ptr< DAVResourceAccess > xResAccess;
+            {
+                osl::MutexGuard aGuard( m_aMutex );
+                xResAccess.reset(
+                    new DAVResourceAccess( *m_xResAccess ) );
+            }
+
+            removeCachedPropertyNames( xResAccess->getURL() );
+            uno::Reference< io::XInputStream > xResult
+                = xResAccess->POST( rArg.MediaType,
+                                    rArg.Referer,
+                                    rArg.Source,
+                                    xEnv );
+
+            {
+                 osl::MutexGuard aGuard( m_aMutex );
+                 m_xResAccess.reset(
+                     new DAVResourceAccess( *xResAccess ) );
+            }
+
+            xSink->setInputStream( xResult );
+        }
+        catch ( DAVException const & e )
+        {
+            cancelCommandExecution( e, xEnv, true );
+            // Unreachable
+        }
+    }
+    else
+    {
+        uno::Reference< io::XOutputStream > xResult( rArg.Sink, uno::UNO_QUERY );
+        if ( xResult.is() )
+        {
+            try
+            {
+                std::unique_ptr< DAVResourceAccess > xResAccess;
+                {
+                    osl::MutexGuard aGuard( m_aMutex );
+                    xResAccess.reset(
+                        new DAVResourceAccess( *m_xResAccess ) );
+                }
+
+                removeCachedPropertyNames( xResAccess->getURL() );
+                xResAccess->POST( rArg.MediaType,
+                                  rArg.Referer,
+                                  rArg.Source,
+                                  xResult,
+                                  xEnv );
+
+                {
+                    osl::MutexGuard aGuard( m_aMutex );
+                    m_xResAccess.reset(
+                        new DAVResourceAccess( *xResAccess ) );
+                }
+            }
+            catch ( DAVException const & e )
+            {
+                cancelCommandExecution( e, xEnv, true );
+                // Unreachable
+            }
+        }
+        else
+        {
+            ucbhelper::cancelCommandExecution(
+                uno::Any(
+                    ucb::UnsupportedDataSinkException(
+                        OUString(),
+                        static_cast< cppu::OWeakObject * >( this ),
+                        rArg.Sink ) ),
+                xEnv );
+            // Unreachable
+        }
+    }
+}
+
+
+void Content::queryChildren( ContentRefList& rChildren )
+{
+    // Obtain a list with a snapshot of all currently instantiated contents
+    // from provider and extract the contents which are direct children
+    // of this content.
+
+    ::ucbhelper::ContentRefList aAllContents;
+    m_xProvider->queryExistingContents( aAllContents );
+
+    OUString aURL = m_xIdentifier->getContentIdentifier();
+    sal_Int32 nURLPos = aURL.lastIndexOf( '/' );
+
+    if ( nURLPos != ( aURL.getLength() - 1 ) )
+    {
+        // No trailing slash found. Append.
+        aURL += "/";
+    }
+
+    sal_Int32 nLen = aURL.getLength();
+
+    for ( const auto& rChild : aAllContents )
+    {
+        ::ucbhelper::ContentImplHelperRef xChild = rChild;
+        OUString aChildURL
+            = xChild->getIdentifier()->getContentIdentifier();
+
+        // Is aURL a prefix of aChildURL?
+        if ( ( aChildURL.getLength() > nLen ) &&
+             ( aChildURL.startsWith( aURL ) ) )
+        {
+            sal_Int32 nPos = nLen;
+            nPos = aChildURL.indexOf( '/', nPos );
+
+            if ( ( nPos == -1 ) ||
+                 ( nPos == ( aChildURL.getLength() - 1 ) ) )
+            {
+                // No further slashes / only a final slash. It's a child!
+                rChildren.push_back(
+                    ::http_dav_ucp::Content::ContentRef(
+                        static_cast< ::http_dav_ucp::Content * >(
+                            xChild.get() ) ) );
+            }
+        }
+    }
+}
+
+
+void Content::insert(
+        const uno::Reference< io::XInputStream > & xInputStream,
+        bool bReplaceExisting,
+        const uno::Reference< ucb::XCommandEnvironment >& Environment )
+{
+    bool bTransient, bCollection;
+    OUString aEscapedTitle;
+    std::unique_ptr< DAVResourceAccess > xResAccess;
+
+    {
+        osl::Guard< osl::Mutex > aGuard( m_aMutex );
+
+        bTransient    = m_bTransient;
+        bCollection   = m_bCollection;
+        aEscapedTitle = m_aEscapedTitle;
+        xResAccess.reset( new DAVResourceAccess( *m_xResAccess ) );
+    }
+
+    // Check, if all required properties are present.
+
+    if ( aEscapedTitle.isEmpty() )
+    {
+        SAL_WARN( "ucb.ucp.webdav", "Content::insert - Title missing!" );
+
+        uno::Sequence<OUString> aProps { "Title" };
+        ucbhelper::cancelCommandExecution(
+            uno::Any( ucb::MissingPropertiesException(
+                                OUString(),
+                                static_cast< cppu::OWeakObject * >( this ),
+                                aProps ) ),
+            Environment );
+        // Unreachable
+    }
+
+    if ( !bReplaceExisting )
+    {
+        /* [RFC 2616] - HTTP
+
+           The PUT method requests that the enclosed entity be stored under the
+           supplied Request-URI. If the Request-URI refers to an already
+           existing resource, the enclosed entity SHOULD be considered as a
+           modified version of the one residing on the origin server.
+        */
+
+        /* [RFC 2518] - WebDAV
+
+           MKCOL creates a new collection resource at the location specified by
+           the Request-URI.  If the resource identified by the Request-URI is
+           non-null then the MKCOL MUST fail.
+        */
+
+        // ==> Complain on PUT, continue on MKCOL.
+        if ( !bTransient || !bCollection )
+        {
+#undef ERROR
+            ucb::UnsupportedNameClashException aEx(
+                "Unable to write without overwrite!",
+                static_cast< cppu::OWeakObject * >( this ),
+                ucb::NameClash::ERROR );
+
+            uno::Reference< task::XInteractionHandler > xIH;
+
+            if ( Environment.is() )
+                xIH = Environment->getInteractionHandler();
+
+            if ( xIH.is() )
+            {
+                uno::Any aExAsAny( aEx );
+
+                rtl::Reference< ucbhelper::SimpleInteractionRequest > xRequest
+                    = new ucbhelper::SimpleInteractionRequest(
+                        aExAsAny,
+                        ContinuationFlags::Approve
+                            | ContinuationFlags::Disapprove );
+                xIH->handle( xRequest );
+
+                const ContinuationFlags nResp = xRequest->getResponse();
+
+                switch ( nResp )
+                {
+                    case ContinuationFlags::NONE:
+                        // Not handled; throw.
+                        throw aEx;
+//                            break;
+
+                    case ContinuationFlags::Approve:
+                        // Continue -> Overwrite.
+                        bReplaceExisting = true;
+                        break;
+
+                    case ContinuationFlags::Disapprove:
+                        // Abort.
+                        throw ucb::CommandFailedException(
+                                    OUString(),
+                                    uno::Reference< uno::XInterface >(),
+                                    aExAsAny );
+//                            break;
+
+                    default:
+                        SAL_WARN( "ucb.ucp.webdav",
+                                    "Content::insert - "
+                                    "Unknown interaction selection!" );
+                        throw ucb::CommandFailedException(
+                                    "Unknown interaction selection!",
+                                    uno::Reference< uno::XInterface >(),
+                                    aExAsAny );
+//                            break;
+                }
+            }
+            else
+            {
+                // No IH; throw.
+                throw aEx;
+            }
+        }
+    }
+
+    if ( bTransient )
+    {
+        // Assemble new content identifier...
+        OUString aURL = getParentURL();
+        if ( aURL.lastIndexOf( '/' ) != ( aURL.getLength() - 1 ) )
+            aURL += "/";
+
+        aURL += aEscapedTitle;
+
+        try
+        {
+            xResAccess->setURL( aURL );
+
+            if ( bCollection )
+            {
+                aStaticDAVOptionsCache.removeDAVOptions( xResAccess->getURL() );
+                removeCachedPropertyNames( xResAccess->getURL() );
+                xResAccess->MKCOL( Environment );
+            }
+            else
+            {
+                // remove options from cache, PUT may change it
+                // it will be refreshed when needed
+                aStaticDAVOptionsCache.removeDAVOptions( xResAccess->getURL() );
+                removeCachedPropertyNames( xResAccess->getURL() );
+                xResAccess->PUT( xInputStream, Environment );
+                // clean cached value of PROPFIND properties names
+            }
+            // no error , set the resourcetype to unknown type
+            // the resource may have transitioned from NOT FOUND or UNKNOWN to something else
+            // depending on the server behaviour
+            // this will force a recheck of the resource type
+            m_eResourceType = UNKNOWN;
+            m_eResourceTypeForLocks = UNKNOWN;
+        }
+        catch ( DAVException const & except )
+        {
+            if ( bCollection )
+            {
+                if ( except.getStatus() == SC_METHOD_NOT_ALLOWED )
+                {
+                    // [RFC 2518] - WebDAV
+                    // 405 (Method Not Allowed) - MKCOL can only be
+                    // executed on a deleted/non-existent resource.
+
+                    if ( bReplaceExisting )
+                    {
+                        // Destroy old resource.
+                        try
+                        {
+                            removeCachedPropertyNames( xResAccess->getURL() );
+                            xResAccess->DESTROY( Environment );
+                        }
+                        catch ( DAVException const & e )
+                        {
+                            cancelCommandExecution( e, Environment, true );
+                            // Unreachable
+                        }
+
+                        // Insert (recursion!).
+                        insert( xInputStream, bReplaceExisting, Environment );
+
+                        {
+                            osl::Guard< osl::Mutex > aGuard( m_aMutex );
+                            m_xResAccess.reset(
+                                new DAVResourceAccess( *xResAccess ) );
+                        }
+
+                        // Success!
+                        return;
+                    }
+                    else
+                    {
+                        OUString aTitle;
+                        try
+                        {
+                            CurlUri const aURI( aURL );
+                            aTitle = aURI.GetPathBaseNameUnescaped();
+                        }
+                        catch ( DAVException const & )
+                        {
+                        }
+
+                        ucbhelper::cancelCommandExecution(
+                            uno::Any(
+                                ucb::NameClashException(
+                                    OUString(),
+                                    static_cast< cppu::OWeakObject * >( this ),
+                                    task::InteractionClassification_ERROR,
+                                    aTitle ) ),
+                            Environment );
+                        // Unreachable
+                    }
+                }
+            }
+
+            cancelCommandExecution( except, Environment, true );
+            // Unreachable
+        }
+
+        {
+            osl::Guard< osl::Mutex > aGuard( m_aMutex );
+            m_xIdentifier
+                = new ::ucbhelper::ContentIdentifier( aURL );
+        }
+
+        inserted();
+
+        {
+            osl::Guard< osl::Mutex > aGuard( m_aMutex );
+            m_bTransient = false;
+        }
+    }
+    else
+    {
+        if ( !xInputStream.is() )
+        {
+            ucbhelper::cancelCommandExecution(
+                uno::Any(
+                    ucb::MissingInputStreamException(
+                        OUString(),
+                        static_cast< cppu::OWeakObject * >( this ) ) ),
+                Environment );
+            // Unreachable
+        }
+
+        // save the URL since it may change due to redirection
+        OUString    aTargetUrl = xResAccess->getURL();
+        try
+        {
+            removeCachedPropertyNames( xResAccess->getURL() );
+            // remove options from cache, PUT may change it
+            // it will be refreshed when needed
+            aStaticDAVOptionsCache.removeDAVOptions( aTargetUrl );
+            xResAccess->PUT( xInputStream, Environment );
+        }
+        catch ( DAVException const & e )
+        {
+            cancelCommandExecution( e, Environment, true );
+            // Unreachable
+        }
+    }
+
+    {
+        osl::Guard< osl::Mutex > aGuard( m_aMutex );
+        m_xResAccess.reset( new DAVResourceAccess( *xResAccess ) );
+    }
+}
+
+
+void Content::transfer(
+        const ucb::TransferInfo & rArgs,
+        const uno::Reference< ucb::XCommandEnvironment >& Environment )
+{
+    uno::Reference< uno::XComponentContext > xContext;
+    uno::Reference< ucb::XContentIdentifier >    xIdentifier;
+    uno::Reference< ucb::XContentProvider >      xProvider;
+    std::unique_ptr< DAVResourceAccess > xResAccess;
+
+    {
+        osl::Guard< osl::Mutex > aGuard( m_aMutex );
+
+        xContext.set( m_xContext );
+        xIdentifier.set( m_xIdentifier );
+        xProvider.set( m_xProvider );
+        xResAccess.reset( new DAVResourceAccess( *m_xResAccess ) );
+    }
+
+    OUString aTargetURI;
+    try
+    {
+        CurlUri sourceURI( rArgs.SourceURL );
+        CurlUri targetURI( xIdentifier->getContentIdentifier() );
+
+        aTargetURI = targetURI.GetPathBaseNameUnescaped();
+
+        // Check source's and target's URL scheme
+
+        OUString aScheme = sourceURI.GetScheme().toAsciiLowerCase();
+        if ( aScheme == VNDSUNSTARWEBDAV_URL_SCHEME)
+        {
+            sourceURI.SetScheme( HTTP_URL_SCHEME );
+        }
+        else if ( aScheme == VNDSUNSTARWEBDAVS_URL_SCHEME)
+        {
+            sourceURI.SetScheme( HTTPS_URL_SCHEME );
+        }
+        else if ( aScheme == DAV_URL_SCHEME )
+        {
+            sourceURI.SetScheme( HTTP_URL_SCHEME );
+        }
+        else if ( aScheme == DAVS_URL_SCHEME )
+        {
+            sourceURI.SetScheme( HTTPS_URL_SCHEME );
+        }
+        else if (aScheme == WEBDAV_URL_SCHEME)
+        {
+            sourceURI.SetScheme(HTTP_URL_SCHEME);
+        }
+        else if (aScheme == WEBDAVS_URL_SCHEME)
+        {
+            sourceURI.SetScheme(HTTPS_URL_SCHEME);
+        }
+        else
+        {
+            if ( aScheme != HTTP_URL_SCHEME && aScheme != HTTPS_URL_SCHEME )
+            {
+                ucbhelper::cancelCommandExecution(
+                    uno::Any(
+                        ucb::InteractiveBadTransferURLException(
+                            "Unsupported URL scheme!",
+                            static_cast< cppu::OWeakObject * >( this ) ) ),
+                    Environment );
+                // Unreachable
+            }
+        }
+
+        aScheme = targetURI.GetScheme().toAsciiLowerCase();
+        if ( aScheme == VNDSUNSTARWEBDAV_URL_SCHEME)
+            targetURI.SetScheme( HTTP_URL_SCHEME );
+        else if ( aScheme == VNDSUNSTARWEBDAVS_URL_SCHEME)
+            targetURI.SetScheme( HTTPS_URL_SCHEME );
+        else if ( aScheme == DAV_URL_SCHEME )
+            targetURI.SetScheme( HTTP_URL_SCHEME );
+        else if ( aScheme == DAVS_URL_SCHEME )
+            targetURI.SetScheme( HTTPS_URL_SCHEME );
+        else if (aScheme == WEBDAV_URL_SCHEME)
+            targetURI.SetScheme(HTTP_URL_SCHEME);
+        else if (aScheme == WEBDAVS_URL_SCHEME)
+            targetURI.SetScheme(HTTPS_URL_SCHEME);
+
+        // @@@ This implementation of 'transfer' only works
+        //     if the source and target are located at same host.
+        //     (Neon does not support cross-server copy/move)
+
+        // Check for same host
+
+        if ( sourceURI.GetHost().getLength() &&
+             ( sourceURI.GetHost() != targetURI.GetHost() ) )
+        {
+            ucbhelper::cancelCommandExecution(
+                uno::Any( ucb::InteractiveBadTransferURLException(
+                                "Different hosts!",
+                                static_cast< cppu::OWeakObject * >( this ) ) ),
+                Environment );
+            // Unreachable
+        }
+
+        OUString aTitle = rArgs.NewTitle;
+
+        if ( aTitle.isEmpty() )
+            aTitle = sourceURI.GetPathBaseNameUnescaped();
+
+        if ( aTitle == "/" )
+        {
+            // kso: ???
+            aTitle.clear();
+        }
+
+        targetURI.AppendPath( aTitle );
+
+        OUString aTargetURL = xIdentifier->getContentIdentifier();
+        if ( ( aTargetURL.lastIndexOf( '/' ) + 1 )
+                != aTargetURL.getLength() )
+            aTargetURL += "/";
+
+        aTargetURL += aTitle;
+
+        uno::Reference< ucb::XContentIdentifier > xTargetId
+            = new ::ucbhelper::ContentIdentifier( aTargetURL );
+
+        DAVResourceAccess aSourceAccess( xContext,
+                                         xResAccess->getSessionFactory(),
+                                         sourceURI.GetURI() );
+
+        if ( rArgs.MoveData )
+        {
+            uno::Reference< ucb::XContentIdentifier > xId
+                = new ::ucbhelper::ContentIdentifier( rArgs.SourceURL );
+
+            // Note: The static cast is okay here, because its sure that
+            //       xProvider is always the WebDAVContentProvider.
+            rtl::Reference< Content > xSource
+                = static_cast< Content * >(
+                    xProvider->queryContent( xId ).get() );
+
+            // [RFC 2518] - WebDAV
+            // If a resource exists at the destination and the Overwrite
+            // header is "T" then prior to performing the move the server
+            // MUST perform a DELETE with "Depth: infinity" on the
+            // destination resource.  If the Overwrite header is set to
+            // "F" then the operation will fail.
+
+            aStaticDAVOptionsCache.removeDAVOptions( sourceURI.GetURI() );
+            aStaticDAVOptionsCache.removeDAVOptions( targetURI.GetURI() );
+            aSourceAccess.MOVE( sourceURI.GetRelativeReference(),
+                                targetURI.GetURI(),
+                                rArgs.NameClash
+                                    == ucb::NameClash::OVERWRITE,
+                                Environment );
+
+            if ( xSource.is() )
+            {
+                // Propagate destruction to listeners.
+                xSource->destroy( true );
+            }
+
+// DAV resources store all additional props on server!
+//              // Rename own and all children's Additional Core Properties.
+//              renameAdditionalPropertySet( xId->getContentIdentifier(),
+//                                           xTargetId->getContentIdentifier(),
+//                                           true );
+        }
+        else
+        {
+            // [RFC 2518] - WebDAV
+            // If a resource exists at the destination and the Overwrite
+            // header is "T" then prior to performing the copy the server
+            // MUST perform a DELETE with "Depth: infinity" on the
+            // destination resource.  If the Overwrite header is set to
+            // "F" then the operation will fail.
+
+            aStaticDAVOptionsCache.removeDAVOptions( sourceURI.GetURI() );
+            aStaticDAVOptionsCache.removeDAVOptions( targetURI.GetURI() );
+            aSourceAccess.COPY( sourceURI.GetRelativeReference(),
+                                targetURI.GetURI(),
+                                rArgs.NameClash
+                                    == ucb::NameClash::OVERWRITE,
+                                Environment );
+
+// DAV resources store all additional props on server!
+//              // Copy own and all children's Additional Core Properties.
+//              copyAdditionalPropertySet( xId->getContentIdentifier(),
+//                                         xTargetId->getContentIdentifier(),
+//                                         true );
+        }
+
+        // Note: The static cast is okay here, because its sure that
+        //       xProvider is always the WebDAVContentProvider.
+        rtl::Reference< Content > xTarget
+            = static_cast< Content * >(
+                    xProvider->queryContent( xTargetId ).get() );
+
+        // Announce transferred content in its new folder.
+        xTarget->inserted();
+    }
+    catch ( ucb::IllegalIdentifierException const & )
+    {
+        // queryContent
+    }
+    catch ( DAVException const & e )
+    {
+        // [RFC 2518] - WebDAV
+        // 412 (Precondition Failed) - The server was unable to maintain
+        // the liveness of the properties listed in the propertybehavior
+        // XML element or the Overwrite header is "F" and the state of
+        // the destination resource is non-null.
+
+        if ( e.getStatus() == SC_PRECONDITION_FAILED )
+        {
+            switch ( rArgs.NameClash )
+            {
+                case 0/*ucb::NameClash::ERROR*/:
+                {
+                    ucbhelper::cancelCommandExecution(
+                        uno::Any(
+                            ucb::NameClashException(
+                                OUString(),
+                                static_cast< cppu::OWeakObject * >( this ),
+                                task::InteractionClassification_ERROR,
+                                aTargetURI ) ),
+                        Environment );
+                    // Unreachable
+                }
+                [[fallthrough]];
+
+                case ucb::NameClash::OVERWRITE:
+                    break;
+
+                case ucb::NameClash::KEEP: // deprecated
+                case ucb::NameClash::RENAME:
+                case ucb::NameClash::ASK:
+                default:
+                {
+                    ucbhelper::cancelCommandExecution(
+                        uno::Any(
+                            ucb::UnsupportedNameClashException(
+                                OUString(),
+                                static_cast< cppu::OWeakObject * >( this ),
+                                rArgs.NameClash ) ),
+                        Environment );
+                    // Unreachable
+                }
+            }
+        }
+
+        cancelCommandExecution( e, Environment, true );
+        // Unreachable
+    }
+
+    {
+        osl::Guard< osl::Mutex > aGuard( m_aMutex );
+        m_xResAccess.reset( new DAVResourceAccess( *xResAccess ) );
+    }
+}
+
+
+void Content::destroy( bool bDeletePhysical )
+{
+    // @@@ take care about bDeletePhysical -> trashcan support
+
+    uno::Reference< ucb::XContent > xThis = this;
+
+    deleted();
+
+    osl::Guard< osl::Mutex > aGuard( m_aMutex );
+
+    // Process instantiated children...
+
+    ::http_dav_ucp::Content::ContentRefList aChildren;
+    queryChildren( aChildren );
+
+    for ( auto& rChild : aChildren )
+    {
+        rChild->destroy( bDeletePhysical );
+    }
+}
+
+// returns the resource type, to be checked for locks
+Content::ResourceType Content::resourceTypeForLocks(
+    const uno::Reference< ucb::XCommandEnvironment >& Environment,
+    const std::unique_ptr< DAVResourceAccess > & rResAccess)
+{
+    ResourceType eResourceTypeForLocks = UNKNOWN;
+    {
+        osl::MutexGuard g(m_aMutex);
+        //check if cache contains what we need, usually the first PROPFIND on the URI has supported lock
+        if (m_xCachedProps)
+        {
+            uno::Sequence< ucb::LockEntry > aSupportedLocks;
+            if ( m_xCachedProps->getValue( DAVProperties::SUPPORTEDLOCK )
+                 >>= aSupportedLocks )            //get the cached value for supportedlock
+            {
+                for ( sal_Int32 n = 0; n < aSupportedLocks.getLength(); ++n )
+                {
+                    if ( aSupportedLocks[ n ].Scope
+                         == ucb::LockScope_EXCLUSIVE &&
+                         aSupportedLocks[ n ].Type
+                         == ucb::LockType_WRITE )
+                        eResourceTypeForLocks = DAV;
+                }
+            }
+        }
+    }
+
+    const OUString & rURL = m_xIdentifier->getContentIdentifier();
+
+    if ( eResourceTypeForLocks == UNKNOWN )
+    {
+        // resource type for lock/unlock operations still unknown, need to ask the server
+
+        //{
+            DAVOptions aDAVOptions;
+            getResourceOptions( Environment, aDAVOptions, rResAccess );
+            if( aDAVOptions.isClass1() ||
+                aDAVOptions.isClass2() ||
+                aDAVOptions.isClass3() )
+            {
+                // this is at least a DAV, lock to be confirmed
+                // class 2 is needed for full lock support
+                // see
+                // <https://tools.ietf.org/html/rfc4918#section-18.2>
+                eResourceTypeForLocks = DAV_NOLOCK;
+                if( aDAVOptions.isClass2() )
+                {
+                    // ok, possible lock, check for it
+                    try
+                    {
+                        // we need only DAV:supportedlock
+                        std::vector< DAVResource > resources;
+                        std::vector< OUString > aPropNames;
+                        uno::Sequence< beans::Property > aProperties( 1 );
+                        aProperties.getArray()[ 0 ].Name = DAVProperties::SUPPORTEDLOCK;
+
+                        ContentProperties::UCBNamesToDAVNames( aProperties, aPropNames );
+                        rResAccess->PROPFIND( DAVZERO, aPropNames, resources, Environment );
+
+                        bool wasSupportedlockFound = false;
+
+                        // only one resource should be returned
+                        if ( resources.size() == 1 )
+                        {
+                            // we may have received a bunch of other properties
+                            // (some servers seems to do so)
+                            // but we need only supported lock for this check
+                            // all returned properties are in
+                            // resources.properties[n].Name/.Value
+
+                            std::vector< DAVPropertyValue >::iterator it;
+
+                            for ( it = resources[0].properties.begin();
+                                  it != resources[0].properties.end(); ++it)
+                            {
+                                if ( (*it).Name ==  DAVProperties::SUPPORTEDLOCK )
+                                {
+                                    wasSupportedlockFound = true;
+                                    uno::Sequence< ucb::LockEntry > aSupportedLocks;
+                                    if ( (*it).Value >>= aSupportedLocks )
+                                    {
+                                        for ( sal_Int32 n = 0; n < aSupportedLocks.getLength(); ++n )
+                                        {
+                                            // TODO: if the lock type is changed from 'exclusive write' to 'shared write'
+                                            // e.g. to implement 'Calc shared file feature', the ucb::LockScope_EXCLUSIVE
+                                            // value should be checked as well, adaptation the code may be needed
+                                            if ( aSupportedLocks[ n ].Scope == ucb::LockScope_EXCLUSIVE &&
+                                                 aSupportedLocks[ n ].Type == ucb::LockType_WRITE )
+                                            {
+                                                // requested locking mode is supported
+                                                eResourceTypeForLocks = DAV;
+                                                SAL_INFO( "ucb.ucp.webdav", "resourceTypeForLocks - URL: <"
+                                                          << m_xIdentifier->getContentIdentifier() << ">, DAV lock/unlock supported");
+                                                break;
+                                            }
+                                        }
+                                        break;
+                                    }
+                                }
+                            }
+                        }
+                        else
+                        {
+                            // PROPFIND failed; check if HEAD contains Content-Disposition: attachment (RFC1806, HTTP/1.1 19.5.1),
+                            // which supposedly means no lock for the resource (happens e.g. with SharePoint exported lists)
+                            OUString sContentDisposition;
+                            // First, check cached properties
+                            if (m_xCachedProps)
+                            {
+                                if ((m_xCachedProps->getValue("Content-Disposition") >>= sContentDisposition)
+                                    && sContentDisposition.startsWithIgnoreAsciiCase("attachment"))
+                                {
+                                    eResourceTypeForLocks = DAV_NOLOCK;
+                                    wasSupportedlockFound = true;
+                                }
+                            }
+                            // If no data in cache, try HEAD request
+                            if (sContentDisposition.isEmpty() && !m_bDidGetOrHead) try
+                            {
+                                DAVResource resource;
+                                GetPropsUsingHeadRequest(resource, rResAccess, {"Content-Disposition"}, Environment);
+                                m_bDidGetOrHead = true;
+                                for (const auto& it : resource.properties)
+                                {
+                                    if (it.Name.equalsIgnoreAsciiCase("Content-Disposition"))
+                                    {
+                                        if ((it.Value >>= sContentDisposition) && sContentDisposition.equalsIgnoreAsciiCase("attachment"))
+                                        {
+                                            eResourceTypeForLocks = DAV_NOLOCK;
+                                            wasSupportedlockFound = true;
+                                        }
+                                        break;
+                                    }
+                                }
+                            }
+                            catch (...){}
+                        }
+                        // check if this is still only a DAV_NOLOCK
+                        // a fallback for resources that do not have DAVProperties::SUPPORTEDLOCK property
+                        // we check for the returned OPTION if LOCK is allowed on the resource
+                        if ( !wasSupportedlockFound && eResourceTypeForLocks == DAV_NOLOCK )
+                        {
+                            SAL_INFO( "ucb.ucp.webdav", "This WebDAV server has no supportedlock property, check for allowed LOCK method in OPTIONS" );
+                            // ATTENTION: if the lock type is changed from 'exclusive write' to 'shared write'
+                            // e.g. to implement 'Calc shared file feature' on WebDAV directly, and we arrive to this fallback
+                            // and the LOCK is allowed, we should assume that only exclusive write lock is available
+                            // this is just a reminder...
+                            if ( aDAVOptions.isLockAllowed() )
+                                eResourceTypeForLocks = DAV;
+                        }
+                    }
+                    catch ( DAVException const & e )
+                    {
+                        rResAccess->resetUri();
+                        //grab the error code
+                        switch( e.getStatus() )
+                        {
+                            case SC_NOT_FOUND:
+                                SAL_WARN( "ucb.ucp.webdav", "resourceTypeForLocks() - URL: <"
+                                          << m_xIdentifier->getContentIdentifier() << "> was not found. ");
+                                eResourceTypeForLocks = NOT_FOUND;
+                                break;
+                                // some servers returns SC_FORBIDDEN, instead
+                                // the meaning of SC_FORBIDDEN is, according to <http://tools.ietf.org/html/rfc7231#section-6.5.3>:
+                                // The 403 (Forbidden) status code indicates that the server understood
+                                // the request but refuses to authorize it
+                            case SC_FORBIDDEN:
+                                // Errors SC_NOT_IMPLEMENTED and SC_METHOD_NOT_ALLOWED are
+                                // part of base http 1.1 RFCs
+                            case SC_NOT_IMPLEMENTED:        // <http://tools.ietf.org/html/rfc7231#section-6.6.2>
+                            case SC_METHOD_NOT_ALLOWED:     // <http://tools.ietf.org/html/rfc7231#section-6.5.5>
+                                // they all mean the resource is NON_DAV
+                                SAL_WARN( "ucb.ucp.webdav", "resourceTypeForLocks() DAVException (SC_FORBIDDEN, SC_NOT_IMPLEMENTED or SC_METHOD_NOT_ALLOWED) - URL: <"
+                                          << m_xIdentifier->getContentIdentifier() << ">, DAV ExceptionCode: " << e.getError() << ", HTTP error: " << e.getStatus() );
+                                eResourceTypeForLocks = NON_DAV;
+                                break;
+                            default:
+                                //fallthrough
+                                SAL_WARN( "ucb.ucp.webdav", "resourceTypeForLocks() DAVException - URL: <"
+                                          << m_xIdentifier->getContentIdentifier() << ">, DAV ExceptionCode: " << e.getError() << ", HTTP error: " << e.getStatus() );
+                                eResourceTypeForLocks = UNKNOWN;
+                        }
+                    }
+                }
+            }
+            else
+                eResourceTypeForLocks = NON_DAV;
+
+        //}
+    }
+    osl::MutexGuard g(m_aMutex);
+    if (m_eResourceTypeForLocks == UNKNOWN)
+    {
+        m_eResourceTypeForLocks = eResourceTypeForLocks;
+    }
+    else
+    {
+        SAL_WARN_IF(
+            eResourceTypeForLocks != m_eResourceTypeForLocks, "ucb.ucp.webdav",
+            "different resource types for <" << rURL << ">: "
+            << +eResourceTypeForLocks << " vs. " << +m_eResourceTypeForLocks);
+    }
+    SAL_INFO( "ucb.ucp.webdav", "resourceTypeForLocks() - URL: <"
+              << m_xIdentifier->getContentIdentifier() << ">, m_eResourceTypeForLocks: " << m_eResourceTypeForLocks );
+    return m_eResourceTypeForLocks;
+}
+
+Content::ResourceType Content::resourceTypeForLocks(
+    const uno::Reference< ucb::XCommandEnvironment >& Environment )
+{
+    std::unique_ptr< DAVResourceAccess > xResAccess;
+    {
+        osl::MutexGuard aGuard( m_aMutex );
+        xResAccess.reset( new DAVResourceAccess( *m_xResAccess ) );
+    }
+    Content::ResourceType ret = resourceTypeForLocks( Environment, xResAccess );
+    {
+        osl::Guard< osl::Mutex > aGuard( m_aMutex );
+        m_xResAccess.reset( new DAVResourceAccess( *xResAccess ) );
+    }
+    return ret;
+}
+
+void Content::lock(
+        const uno::Reference< ucb::XCommandEnvironment >& Environment )
+{
+// prepare aURL to be used in exception, see below
+    OUString aURL;
+    if ( m_bTransient )
+    {
+        aURL = getParentURL();
+        if ( aURL.lastIndexOf('/') != ( aURL.getLength() - 1 ) )
+            aURL += "/";
+
+        aURL += m_aEscapedTitle;
+    }
+    else
+    {
+        aURL = m_xIdentifier->getContentIdentifier();
+    }
+
+    try
+    {
+        std::unique_ptr< DAVResourceAccess > xResAccess;
+        {
+            osl::Guard< osl::Mutex > aGuard( m_aMutex );
+            xResAccess.reset( new DAVResourceAccess( *m_xResAccess ) );
+        }
+
+        uno::Any aOwnerAny;
+        OUString const user(officecfg::Office::Common::Save::Document::UseUserData::get()
+                ? " - " + ::svt::LockFileCommon::GetOOOUserName()
+                : OUString());
+        aOwnerAny <<= OUString("LibreOffice" + user);
+
+        ucb::Lock aLock(
+            ucb::LockScope_EXCLUSIVE,
+            ucb::LockType_WRITE,
+            ucb::LockDepth_ZERO,
+            aOwnerAny,
+            180, // lock timeout in secs
+            //-1, // infinite lock
+            uno::Sequence< OUString >() );
+
+        // OPTIONS may change as a consequence of the lock operation
+        aStaticDAVOptionsCache.removeDAVOptions( xResAccess->getURL() );
+        removeCachedPropertyNames( xResAccess->getURL() );
+        xResAccess->LOCK( aLock, Environment );
+
+        {
+            osl::Guard< osl::Mutex > aGuard( m_aMutex );
+            m_xResAccess.reset( new DAVResourceAccess( *xResAccess ) );
+        }
+    }
+    catch ( DAVException const & e )
+    {
+        // check if the exception thrown is 'already locked'
+        // this exception is mapped directly to the ucb correct one, without
+        // going into the cancelCommandExecution() user interaction
+        // this exception should be managed by the issuer of 'lock' command
+        switch( e.getError() )
+        {
+            case DAVException::DAV_LOCKED:
+            {
+                SAL_WARN( "ucb.ucp.webdav", "lock(): resource already locked - URL: <"
+                          << m_xIdentifier->getContentIdentifier() << ">");
+                throw
+                    ucb::InteractiveLockingLockedException(
+                        "Locked!",
+                        static_cast< cppu::OWeakObject * >( this ),
+                        task::InteractionClassification_ERROR,
+                        aURL,
+                        false );
+            }
+            break;
+            case DAVException::DAV_HTTP_NOAUTH:
+            case DAVException::DAV_HTTP_AUTH:
+            {
+                SAL_WARN( "ucb.ucp.webdav", "lock(): DAVException Authentication error - URL: <"
+                          << m_xIdentifier->getContentIdentifier() << ">" );
+                // DAVException::DAV_HTTP_AUTH exception can mean:
+                // - interaction handler for credential management not present (happens, depending
+                //   on the LO framework processing)
+                // - the remote site is a WebDAV with special configuration: read/only for read operations
+                //   and read/write for write operations, the user is not allowed to lock/write and
+                //   she cancelled the credentials request.
+                //   this is not actually an error, but the exception is sent directly from here, avoiding the automatic
+                //   management that takes part in cancelCommandExecution() below
+                // Unfortunately there is no InteractiveNetwork*Exception available to signal this
+                // since it mostly happens on read/only part of webdav, this appears to be the most correct exception available
+                throw
+                    ucb::InteractiveNetworkWriteException(
+                        "Authentication error while trying to lock! Write only WebDAV perhaps?",
+                        static_cast< cppu::OWeakObject * >( this ),
+                        task::InteractionClassification_ERROR,
+                        e.getData() );
+            }
+            break;
+            case DAVException::DAV_HTTP_ERROR:
+                //grab the error code
+                switch( e.getStatus() )
+                {
+                    // The 'case SC_NOT_FOUND' just below tries to solve a problem in eXo Platform
+                    // WebDAV connector which apparently fail on resource first creation
+                    // rfc4918 section-7.3 (see link below)
+                    case SC_NOT_FOUND:              // <http://tools.ietf.org/html/rfc7231#section-6.5.4>
+                    // The 'case SC_PRECONDITION_FAILED' just below tries to solve a problem
+                    // in SharePoint when locking the resource on first creation fails due to this:
+                    // <https://msdn.microsoft.com/en-us/library/jj575265%28v=office.12%29.aspx#id15>
+                    // (retrieved on 2015-08-14)
+                    case SC_PRECONDITION_FAILED:    // <http://tools.ietf.org/html/rfc7232#section-4.2>
+                        // Errors SC_NOT_IMPLEMENTED and SC_METHOD_NOT_ALLOWED are
+                        // part of base http 1.1 RFCs
+                    case SC_NOT_IMPLEMENTED:        // <http://tools.ietf.org/html/rfc7231#section-6.6.2>
+                    case SC_METHOD_NOT_ALLOWED:     // <http://tools.ietf.org/html/rfc7231#section-6.5.5>
+                        SAL_WARN( "ucb.ucp.webdav", "lock() DAVException (SC_NOT_FOUND, SC_PRECONDITION_FAILED, SC_NOT_IMPLEMENTED or SC_METHOD_NOT_ALLOWED) - URL: <"
+                                  << m_xIdentifier->getContentIdentifier() << ">, DAV ExceptionCode: " << e.getError() << ", HTTP error: " << e.getStatus() );
+                        // act as nothing happened
+                        // that's because when a resource is first created
+                        // the lock is sent before the put, so the resource
+                        // is actually created by LOCK, locking it before
+                        // the first PUT, but if LOCK is not supported
+                        // (simple web or DAV with lock disabled) we end with one of these http
+                        // errors.
+                        // These same errors may be reported when the LOCK on an unmapped
+                        // (i.e. non existent) resource is not implemented.
+                        // Detailed specification in:
+                        // <http://tools.ietf.org/html/rfc4918#section-7.3>
+                        return;
+                    default:
+                        //fallthrough
+                        ;
+                }
+                break;
+            case DAVException::DAV_LOCKED_SELF:
+                // we already hold the lock and it is in our internal lockstore
+                // just return as if the lock was successful
+                return;
+            default:
+                //fallthrough
+                ;
+        }
+
+        SAL_WARN( "ucb.ucp.webdav","lock() DAVException - URL: <"
+                  << m_xIdentifier->getContentIdentifier() << ">, DAV ExceptionCode: " << e.getError() << ", HTTP error: " << e.getStatus() );
+        cancelCommandExecution( e, Environment, false );
+        // Unreachable
+    }
+}
+
+
+void Content::unlock(
+        const uno::Reference< ucb::XCommandEnvironment >& Environment )
+{
+
+    try
+    {
+        std::unique_ptr< DAVResourceAccess > xResAccess;
+        {
+            osl::Guard< osl::Mutex > aGuard( m_aMutex );
+            xResAccess.reset( new DAVResourceAccess( *m_xResAccess ) );
+        }
+
+        // check if the target URL is a Class1 DAV
+        DAVOptions aDAVOptions;
+        getResourceOptions( Environment, aDAVOptions, xResAccess );
+
+        // at least class one is needed
+        if( aDAVOptions.isClass1() )
+        {
+            // remove options from cache, unlock may change it
+            // it will be refreshed when needed
+            aStaticDAVOptionsCache.removeDAVOptions( xResAccess->getURL() );
+            // clean cached value of PROPFIND properties names
+            removeCachedPropertyNames( xResAccess->getURL() );
+            xResAccess->UNLOCK( Environment );
+        }
+
+        {
+            osl::Guard< osl::Mutex > aGuard( m_aMutex );
+            m_xResAccess.reset( new DAVResourceAccess( *xResAccess ) );
+        }
+    }
+    catch ( DAVException const & e )
+    {
+        switch( e.getError() )
+        {
+            case DAVException::DAV_NOT_LOCKED:
+                SAL_WARN( "ucb.ucp.webdav", "unlock(): DAVException::DAV_NOT_LOCKED - URL: <"
+                          << m_xIdentifier->getContentIdentifier() << ">");
+                // means that we don't own any lock on this resource
+                // intercepted here to remove a confusing indication to the user
+                // unfortunately this happens in some WebDAV server configuration
+                // acting as WebDAV and having lock/unlock enabled only
+                // for authorized user.
+                return;
+            case DAVException::DAV_HTTP_ERROR:
+                //grab the error code
+                switch( e.getStatus() )
+                {
+                    // Errors SC_NOT_IMPLEMENTED and SC_METHOD_NOT_ALLOWED are
+                    // part of base http 1.1 RFCs
+                    case SC_NOT_IMPLEMENTED:        // <http://tools.ietf.org/html/rfc7231#section-6.6.2>
+                    case SC_METHOD_NOT_ALLOWED:     // <http://tools.ietf.org/html/rfc7231#section-6.5.5>
+                        SAL_WARN( "ucb.ucp.webdav", "unlock() DAVException (SC_NOT_IMPLEMENTED or SC_METHOD_NOT_ALLOWED) - URL: <"
+                                  << m_xIdentifier->getContentIdentifier() << ">, DAV ExceptionCode: " << e.getError() << ", HTTP error: " << e.getStatus() );
+                        return;
+                    default:
+                        //fallthrough
+                        ;
+                }
+                break;
+            default:
+                //fallthrough
+                ;
+        }
+        SAL_WARN( "ucb.ucp.webdav","unlock() DAVException - URL: <"
+                  << m_xIdentifier->getContentIdentifier() << ">, DAV ExceptionCode: " << e.getError() << ", HTTP error: " << e.getStatus() );
+        cancelCommandExecution( e, Environment, false );
+        // Unreachable
+    }
+}
+
+
+bool Content::exchangeIdentity(
+    const uno::Reference< ucb::XContentIdentifier >& xNewId )
+{
+    if ( !xNewId.is() )
+        return false;
+
+    osl::ClearableGuard< osl::Mutex > aGuard( m_aMutex );
+
+    uno::Reference< ucb::XContent > xThis = this;
+
+    // Already persistent?
+    if ( m_bTransient )
+    {
+        SAL_WARN( "ucb.ucp.webdav", "Content::exchangeIdentity - Not persistent!" );
+        return false;
+    }
+
+    // Exchange own identity.
+
+    // Fail, if a content with given id already exists.
+//  if ( !hasData( xNewId ) )
+    {
+        OUString aOldURL = m_xIdentifier->getContentIdentifier();
+
+        aGuard.clear();
+        if ( exchange( xNewId ) )
+        {
+            // Process instantiated children...
+
+            ContentRefList aChildren;
+            queryChildren( aChildren );
+
+            for ( const auto& rChild : aChildren )
+            {
+                ContentRef xChild = rChild;
+
+                // Create new content identifier for the child...
+                uno::Reference< ucb::XContentIdentifier >
+                    xOldChildId = xChild->getIdentifier();
+                OUString aOldChildURL
+                    = xOldChildId->getContentIdentifier();
+                OUString aNewChildURL
+                    = aOldChildURL.replaceAt(
+                        0,
+                        aOldURL.getLength(),
+                        xNewId->getContentIdentifier() );
+                uno::Reference< ucb::XContentIdentifier > xNewChildId
+                    = new ::ucbhelper::ContentIdentifier( aNewChildURL );
+
+                if ( !xChild->exchangeIdentity( xNewChildId ) )
+                    return false;
+            }
+            return true;
+        }
+    }
+
+    SAL_WARN( "ucb.ucp.webdav",
+                "Content::exchangeIdentity - "
+                "Panic! Cannot exchange identity!" );
+    return false;
+}
+
+
+bool Content::isFolder(
+            const uno::Reference< ucb::XCommandEnvironment >& xEnv )
+{
+    {
+        osl::MutexGuard aGuard( m_aMutex );
+
+        if ( m_bTransient )
+            return m_bCollection;
+    }
+
+    uno::Sequence< beans::Property > aProperties( 1 );
+    auto pProperties = aProperties.getArray();
+    pProperties[ 0 ].Name   = "IsFolder";
+    pProperties[ 0 ].Handle = -1;
+    uno::Reference< sdbc::XRow > xRow( getPropertyValues( aProperties, xEnv ) );
+    if ( xRow.is() )
+    {
+        try
+        {
+            return xRow->getBoolean( 1 );
+        }
+        catch ( sdbc::SQLException const & )
+        {
+        }
+    }
+
+    return false;
+}
+
+
+uno::Any Content::MapDAVException( const DAVException & e, bool bWrite )
+{
+    // Map DAVException...
+    uno::Any aException;
+
+    OUString aURL;
+    if ( m_bTransient )
+    {
+        aURL = getParentURL();
+        if ( aURL.lastIndexOf( '/' ) != ( aURL.getLength() - 1 ) )
+            aURL += "/";
+
+        aURL += m_aEscapedTitle;
+    }
+    else
+    {
+        aURL = m_xIdentifier->getContentIdentifier();
+    }
+
+    switch ( e.getStatus() )
+    {
+        case SC_NOT_FOUND:
+        {
+            uno::Sequence<uno::Any> aArgs{ uno::Any(beans::PropertyValue(
+                "Uri", -1, uno::Any(aURL), beans::PropertyState_DIRECT_VALUE)) };
+
+            aException <<=
+                ucb::InteractiveAugmentedIOException(
+                    "Not found!",
+                    static_cast< cppu::OWeakObject * >( this ),
+                    task::InteractionClassification_ERROR,
+                    ucb::IOErrorCode_NOT_EXISTING,
+                    aArgs );
+            return aException;
+        }
+        default:
+            break;
+    }
+
+    switch ( e.getError() )
+    {
+    case DAVException::DAV_HTTP_ERROR:
+        {
+            if ( bWrite )
+                aException <<=
+                    ucb::InteractiveNetworkWriteException(
+                        e.getData(),
+                        static_cast< cppu::OWeakObject * >( this ),
+                        task::InteractionClassification_ERROR,
+                        e.getData() );
+            else
+                aException <<=
+                    ucb::InteractiveNetworkReadException(
+                        e.getData(),
+                        static_cast< cppu::OWeakObject * >( this ),
+                        task::InteractionClassification_ERROR,
+                        e.getData() );
+            break;
+        }
+
+    case DAVException::DAV_HTTP_LOOKUP:
+        aException <<=
+            ucb::InteractiveNetworkResolveNameException(
+                OUString(),
+                static_cast< cppu::OWeakObject * >( this ),
+                task::InteractionClassification_ERROR,
+                e.getData() );
+        break;
+
+// @@@ No matching InteractiveNetwork*Exception
+//    case DAVException::DAV_HTTP_AUTH:
+//        break;
+
+// @@@ No matching InteractiveNetwork*Exception
+//    case DAVException::DAV_HTTP_AUTHPROXY:
+//        break;
+
+    case DAVException::DAV_HTTP_TIMEOUT:
+    case DAVException::DAV_HTTP_CONNECT:
+        aException <<=
+            ucb::InteractiveNetworkConnectException(
+                OUString(),
+                static_cast< cppu::OWeakObject * >( this ),
+                task::InteractionClassification_ERROR,
+                e.getData() );
+        break;
+
+// @@@ No matching InteractiveNetwork*Exception
+//     case DAVException::DAV_HTTP_REDIRECT:
+//         break;
+
+// @@@ No matching InteractiveNetwork*Exception
+//     case DAVException::DAV_SESSION_CREATE:
+//         break;
+
+    case DAVException::DAV_INVALID_ARG:
+        aException <<=
+            lang::IllegalArgumentException(
+                OUString(),
+                static_cast< cppu::OWeakObject * >( this ),
+                -1 );
+        break;
+
+    case DAVException::DAV_LOCKED:
+#if 1
+        aException <<=
+            ucb::InteractiveLockingLockedException(
+                "Locked!",
+                static_cast< cppu::OWeakObject * >( this ),
+                task::InteractionClassification_ERROR,
+                aURL,
+                false ); // not SelfOwned
+#else
+        {
+            uno::Sequence< uno::Any > aArgs( 1 );
+            aArgs[ 0 ] <<= beans::PropertyValue(
+                OUString("Uri"), -1,
+                uno::makeAny(aURL),
+                beans::PropertyState_DIRECT_VALUE);
+
+            aException <<=
+                ucb::InteractiveAugmentedIOException(
+                    OUString( "Locked!" ),
+                    static_cast< cppu::OWeakObject * >( this ),
+                    task::InteractionClassification_ERROR,
+                    ucb::IOErrorCode_LOCKING_VIOLATION,
+                    aArgs );
+        }
+#endif
+        break;
+
+    case DAVException::DAV_LOCKED_SELF:
+        aException <<=
+            ucb::InteractiveLockingLockedException(
+                "Locked (self)!",
+                static_cast< cppu::OWeakObject * >( this ),
+                task::InteractionClassification_ERROR,
+                aURL,
+                true ); // SelfOwned
+        break;
+
+    case DAVException::DAV_NOT_LOCKED:
+        aException <<=
+            ucb::InteractiveLockingNotLockedException(
+                "Not locked!",
+                static_cast< cppu::OWeakObject * >( this ),
+                task::InteractionClassification_ERROR,
+                aURL );
+        break;
+
+    case DAVException::DAV_LOCK_EXPIRED:
+        aException <<=
+            ucb::InteractiveLockingLockExpiredException(
+                "Lock expired!",
+                static_cast< cppu::OWeakObject * >( this ),
+                task::InteractionClassification_ERROR,
+                aURL );
+        break;
+
+    default:
+        aException <<=
+            ucb::InteractiveNetworkGeneralException(
+                OUString(),
+                static_cast< cppu::OWeakObject * >( this ),
+                task::InteractionClassification_ERROR );
+        break;
+    }
+
+    return aException;
+}
+
+
+// static
+bool Content::shouldAccessNetworkAfterException( const DAVException & e )
+{
+    if ( ( e.getStatus() == SC_NOT_FOUND ) ||
+         ( e.getStatus() == SC_GONE ) ||
+         ( e.getError() == DAVException::DAV_HTTP_TIMEOUT ) ||
+         ( e.getError() == DAVException::DAV_HTTP_LOOKUP ) ||
+         ( e.getError() == DAVException::DAV_HTTP_CONNECT ) ||
+         ( e.getError() == DAVException::DAV_HTTP_NOAUTH ) ||
+         ( e.getError() == DAVException::DAV_HTTP_AUTH ) ||
+         ( e.getError() == DAVException::DAV_HTTP_AUTHPROXY ) )
+        return false;
+
+    return true;
+}
+
+
+void Content::cancelCommandExecution(
+                const DAVException & e,
+                const uno::Reference< ucb::XCommandEnvironment > & xEnv,
+                bool bWrite /* = false */ )
+{
+    ucbhelper::cancelCommandExecution( MapDAVException( e, bWrite ), xEnv );
+    // Unreachable
+}
+
+
+OUString
+Content::getBaseURI( const std::unique_ptr< DAVResourceAccess > & rResAccess )
+{
+    osl::Guard< osl::Mutex > aGuard( m_aMutex );
+
+    // First, try to obtain value of response header "Content-Location".
+    if (m_xCachedProps)
+    {
+        OUString aLocation;
+        m_xCachedProps->getValue( "Content-Location" ) >>= aLocation;
+        if ( aLocation.getLength() )
+        {
+            try
+            {
+                // Do not use m_xIdentifier->getContentIdentifier() because it
+                // for example does not reflect redirects applied to requests
+                // done using the original URI but m_xResAccess' URI does.
+                return rtl::Uri::convertRelToAbs( rResAccess->getURL(),
+                                                  aLocation );
+            }
+            catch ( rtl::MalformedUriException const & )
+            {
+            }
+        }
+    }
+
+    return rResAccess->getURL();
+}
+
+// resource type is the type of the WebDAV resource
+Content::ResourceType Content::getResourceType(
+                    const uno::Reference< ucb::XCommandEnvironment >& xEnv,
+                    const std::unique_ptr< DAVResourceAccess > & rResAccess,
+                    bool * networkAccessAllowed )
+{
+    {
+        osl::MutexGuard g(m_aMutex);
+        if (m_eResourceType != UNKNOWN) {
+            return m_eResourceType;
+        }
+    }
+
+    ResourceType eResourceType = UNKNOWN;
+    DAVOptions aDAVOptions;
+
+    {
+        getResourceOptions( xEnv, aDAVOptions, rResAccess, networkAccessAllowed );
+
+        // at least class one is needed
+        if( aDAVOptions.isClass1() )
+        {
+            try
+            {
+                // Try to fetch some frequently used property value, e.g. those
+                // used when loading documents... along with identifying whether
+                // this is a DAV resource.
+                std::vector< DAVResource > resources;
+                std::vector< OUString > aPropNames;
+                uno::Sequence< beans::Property > aProperties( 5 );
+                auto pProperties = aProperties.getArray();
+                pProperties[ 0 ].Name = "IsFolder";
+                pProperties[ 1 ].Name = "IsDocument";
+                pProperties[ 2 ].Name = "IsReadOnly";
+                pProperties[ 3 ].Name = "MediaType";
+                pProperties[ 4 ].Name = DAVProperties::SUPPORTEDLOCK;
+
+                ContentProperties::UCBNamesToDAVNames( aProperties, aPropNames );
+
+                rResAccess->PROPFIND( DAVZERO, aPropNames, resources, xEnv );
+
+                if ( resources.size() == 1 )
+                {
+#if defined SAL_LOG_INFO
+                    {//debug
+                        // print received resources
+                        std::vector< DAVPropertyValue >::const_iterator it = resources[0].properties.begin();
+                        std::vector< DAVPropertyValue >::const_iterator end = resources[0].properties.end();
+                        while ( it != end )
+                        {
+                            OUString aPropValue;
+                            bool    bValue;
+                            uno::Sequence< ucb::LockEntry > aSupportedLocks;
+                            if((*it).Value >>= aPropValue )
+                                SAL_INFO( "ucb.ucp.webdav", "PROPFIND (getResourceType) - ret'd prop: " << (*it).Name << ":" << aPropValue );
+                            else if( (*it).Value >>= bValue )
+                                SAL_INFO( "ucb.ucp.webdav", "PROPFIND (getResourceType) - ret'd prop: " << (*it).Name << ":" <<
+                                          ( bValue ? "true" : "false" ) );
+                            else if( (*it).Value >>= aSupportedLocks )
+                            {
+                                SAL_INFO( "ucb.ucp.webdav", "PROPFIND (getResourceType) - ret'd prop: " << (*it).Name << ":" );
+                                for ( sal_Int32 n = 0; n < aSupportedLocks.getLength(); ++n )
+                                {
+                                    SAL_INFO( "ucb.ucp.webdav","PROPFIND (getResourceType) -       supportedlock[" << n <<"]: scope: "
+                                              << (aSupportedLocks[n].Scope == ucb::LockScope_SHARED ? "shared" : "exclusive")
+                                              << ", type: "
+                                              << (aSupportedLocks[n].Type != ucb::LockType_WRITE ? "" : "write") );
+                                }
+                            }
+                            ++it;
+                        }
+                    }
+#endif
+                    osl::MutexGuard g(m_aMutex);
+                    m_xCachedProps.reset(
+                        new CachableContentProperties( ContentProperties( resources[ 0 ] ) ) );
+                    m_xCachedProps->containsAllNames(
+                        aProperties, m_aFailedPropNames );
+                }
+                eResourceType = DAV;
+            }
+            catch ( DAVException const & e )
+            {
+                rResAccess->resetUri();
+
+                SAL_WARN( "ucb.ucp.webdav", "Content::getResourceType returned errors, DAV ExceptionCode: " << e.getError() << ", HTTP error: "  << e.getStatus() );
+
+                if ( e.getStatus() == SC_METHOD_NOT_ALLOWED )
+                {
+                    // Status SC_METHOD_NOT_ALLOWED is a safe indicator that the
+                    // resource is NON_DAV
+                    eResourceType = NON_DAV;
+                }
+                else if (networkAccessAllowed != nullptr)
+                {
+                    *networkAccessAllowed = *networkAccessAllowed
+                        && shouldAccessNetworkAfterException(e);
+                }
+                if ( e.getStatus() == SC_NOT_FOUND )
+                {
+                    // arrives here if OPTIONS is still cached for a resource previously available
+                    // operate on the OPTIONS cache:
+                    // if OPTIONS was not found, do nothing
+                    // else OPTIONS returned on a resource not existent  (example a server that allows lock on null resource) set
+                    // not found and adjust lifetime accordingly
+                    DAVOptions aDAVOptionsInner;
+                    if (aStaticDAVOptionsCache.getDAVOptions(rResAccess->getURL(), aDAVOptionsInner))
+                    {
+                        // TODO? get redirected url
+                        aDAVOptionsInner.setHttpResponseStatusCode( e.getStatus() );
+                        aDAVOptionsInner.setHttpResponseStatusText( e.getData() );
+                        aStaticDAVOptionsCache.addDAVOptions( aDAVOptionsInner,
+                                                              m_nOptsCacheLifeNotFound );
+                    }
+                }
+                // if the two net events below happen, something
+                // is going on to the connection so break the command flow
+                if ( ( e.getError() == DAVException::DAV_HTTP_TIMEOUT ) ||
+                     ( e.getError() == DAVException::DAV_HTTP_CONNECT ) )
+                {
+                    cancelCommandExecution( e, xEnv );
+                    // unreachable
+                }
+
+                // cancel command execution is case that no user authentication data has been provided.
+                if ( e.getError() == DAVException::DAV_HTTP_NOAUTH )
+                {
+                    cancelCommandExecution( e, uno::Reference< ucb::XCommandEnvironment >() );
+                }
+            }
+        }
+        else
+        {
+            rResAccess->resetUri();
+
+            // first check if the cached error can be mapped to DAVException::DAV_HTTP_TIMEOUT or mapped to DAVException::DAV_HTTP_CONNECT
+            if (aDAVOptions.getHttpResponseStatusCode() == USC_CONNECTION_TIMED_OUT
+                // can't get any reliable info without auth => cancel request
+                || aDAVOptions.getHttpResponseStatusCode() == USC_AUTH_FAILED
+                || aDAVOptions.getHttpResponseStatusCode() == USC_AUTHPROXY_FAILED)
+            {
+                // behave same as DAVException::DAV_HTTP_TIMEOUT or DAVException::DAV_HTTP_CONNECT was thrown
+                try
+                {
+                    // extract host name and connection port
+                    CurlUri   theUri( rResAccess->getURL() );
+                    OUString  aHostName  = theUri.GetHost();
+                    sal_Int32 nPort      = theUri.GetPort();
+                    DAVException::ExceptionCode e{};
+                    switch (aDAVOptions.getHttpResponseStatusCode())
+                    {
+                        case USC_CONNECTION_TIMED_OUT:
+                            e = DAVException::DAV_HTTP_TIMEOUT;
+                            break;
+                        case USC_AUTH_FAILED:
+                            e = DAVException::DAV_HTTP_AUTH;
+                            break;
+                        case USC_AUTHPROXY_FAILED:
+                            e = DAVException::DAV_HTTP_AUTHPROXY;
+                            break;
+                        default:
+                            assert(false);
+                    }
+                    throw DAVException( e,
+                                        ConnectionEndPointString(aHostName, nPort) );
+                }
+                catch ( DAVException& exp )
+                {
+                    cancelCommandExecution( exp, xEnv );
+                }
+            }
+
+            if ( aDAVOptions.getHttpResponseStatusCode() != SC_NOT_FOUND &&
+                 aDAVOptions.getHttpResponseStatusCode() != SC_GONE ) // the cached OPTIONS can have SC_GONE
+            {
+                eResourceType = NON_DAV;
+            }
+            else
+            {
+                //resource doesn't exist
+                if ( networkAccessAllowed != nullptr )
+                    *networkAccessAllowed = false;
+            }
+        }
+    }
+
+    osl::MutexGuard g(m_aMutex);
+    if (m_eResourceType == UNKNOWN) {
+        m_eResourceType = eResourceType;
+    } else {
+        SAL_WARN_IF(
+            eResourceType != m_eResourceType, "ucb.ucp.webdav",
+            "different resource types for <" << rResAccess->getURL() << ">: "
+            << +eResourceType << " vs. " << +m_eResourceType);
+    }
+    SAL_INFO( "ucb.ucp.webdav", "m_eResourceType for <" << rResAccess->getURL() << ">: " << m_eResourceType );
+    return m_eResourceType;
+}
+
+
+Content::ResourceType Content::getResourceType(
+                    const uno::Reference< ucb::XCommandEnvironment >& xEnv )
+{
+    std::unique_ptr< DAVResourceAccess > xResAccess;
+    {
+        osl::MutexGuard aGuard( m_aMutex );
+        xResAccess.reset( new DAVResourceAccess( *m_xResAccess ) );
+    }
+    const Content::ResourceType & ret = getResourceType( xEnv, xResAccess );
+    {
+        osl::Guard< osl::Mutex > aGuard( m_aMutex );
+        m_xResAccess.reset( new DAVResourceAccess( *xResAccess ) );
+    }
+    return ret;
+}
+
+
+void Content::initOptsCacheLifeTime()
+{
+    // see description in
+    // officecfg/registry/schema/org/openoffice/Inet.xcs
+    // for use of these field values.
+    sal_uInt32 nAtime;
+    nAtime = officecfg::Inet::Settings::OptsCacheLifeImplWeb::get();
+    m_nOptsCacheLifeImplWeb = std::max( sal_uInt32( 0 ),
+                                        std::min( nAtime, sal_uInt32( 3600 ) ) );
+
+    nAtime = officecfg::Inet::Settings::OptsCacheLifeDAV::get();
+    m_nOptsCacheLifeDAV = std::max( sal_uInt32( 0 ),
+                                    std::min( nAtime, sal_uInt32( 3600 ) ) );
+
+    nAtime = officecfg::Inet::Settings::OptsCacheLifeDAVLocked::get();
+    m_nOptsCacheLifeDAVLocked = std::max( sal_uInt32( 0 ),
+                                    std::min( nAtime, sal_uInt32( 3600 ) ) );
+
+    nAtime = officecfg::Inet::Settings::OptsCacheLifeNotImpl::get();
+    m_nOptsCacheLifeNotImpl = std::max( sal_uInt32( 0 ),
+                                              std::min( nAtime, sal_uInt32( 43200 ) ) );
+
+    nAtime = officecfg::Inet::Settings::OptsCacheLifeNotFound::get();
+    m_nOptsCacheLifeNotFound = std::max( sal_uInt32( 0 ),
+                                              std::min( nAtime, sal_uInt32( 30 ) ) );
+}
+
+
+void Content::getResourceOptions(
+                    const css::uno::Reference< css::ucb::XCommandEnvironment >& xEnv,
+                    DAVOptions& rDAVOptions,
+                    const std::unique_ptr< DAVResourceAccess > & rResAccess,
+                    bool * networkAccessAllowed )
+{
+    OUString aRedirURL;
+    OUString aTargetURL = rResAccess->getURL();
+    DAVOptions aDAVOptions;
+    // first check if in cache, if not, then send method to server
+    if ( !aStaticDAVOptionsCache.getDAVOptions( aTargetURL, aDAVOptions ) )
+    {
+        try
+        {
+            rResAccess->OPTIONS( aDAVOptions, xEnv );
+            // IMPORTANT:the correctly implemented server will answer without errors, even if the resource is not present
+            sal_uInt32 nLifeTime = ( aDAVOptions.isClass1() ||
+                                     aDAVOptions.isClass2() ||
+                                     aDAVOptions.isClass3() ) ?
+                m_nOptsCacheLifeDAV : // a WebDAV site
+                m_nOptsCacheLifeImplWeb;  // a site implementing OPTIONS but
+                                          // it's not DAV
+            // if resource is locked, will use a
+            // different lifetime
+            if( aDAVOptions.isLocked() )
+                nLifeTime = m_nOptsCacheLifeDAVLocked;
+
+            // check if redirected
+            aRedirURL = rResAccess->getURL();
+            if( aRedirURL == aTargetURL)
+            { // no redirection
+                aRedirURL.clear();
+            }
+            // cache this URL's option
+            aDAVOptions.setURL( aTargetURL );
+            aDAVOptions.setRedirectedURL( aRedirURL );
+            aStaticDAVOptionsCache.addDAVOptions( aDAVOptions,
+                                                  nLifeTime );
+        }
+        catch ( DAVException const & e )
+        {
+            // first, remove from cache, will be added if needed, depending on the error received
+            aStaticDAVOptionsCache.removeDAVOptions( aTargetURL );
+            rResAccess->resetUri();
+
+            aDAVOptions.setURL( aTargetURL );
+            aDAVOptions.setRedirectedURL( aRedirURL );
+            switch( e.getError() )
+            {
+                case DAVException::DAV_HTTP_TIMEOUT:
+                case DAVException::DAV_HTTP_CONNECT:
+                {
+                    // something bad happened to the connection
+                    // not same as not found, this instead happens when the server doesn't exist or doesn't answer at all
+                    // probably a new bit stating 'timed out' should be added to opts var?
+                    // in any case abort the command
+                    SAL_WARN( "ucb.ucp.webdav", "OPTIONS - DAVException: DAV_HTTP_TIMEOUT or DAV_HTTP_CONNECT for URL <" << m_xIdentifier->getContentIdentifier() << ">" );
+                    // cache the internal unofficial status code
+
+                    aDAVOptions.setHttpResponseStatusCode( USC_CONNECTION_TIMED_OUT );
+                    // used only internally, so the text doesn't really matter..
+                    aStaticDAVOptionsCache.addDAVOptions( aDAVOptions,
+                                                          m_nOptsCacheLifeNotFound );
+                    if ( networkAccessAllowed != nullptr )
+                    {
+                        *networkAccessAllowed = *networkAccessAllowed
+                            && shouldAccessNetworkAfterException(e);
+                    }
+                }
+                break;
+                case DAVException::DAV_HTTP_LOOKUP:
+                {
+                    SAL_WARN( "ucb.ucp.webdav", "OPTIONS - DAVException: DAV_HTTP_LOOKUP for URL <" << m_xIdentifier->getContentIdentifier() << ">" );
+                    aDAVOptions.setHttpResponseStatusCode( USC_LOOKUP_FAILED );
+                    // used only internally, so the text doesn't really matter..
+                    aStaticDAVOptionsCache.addDAVOptions( aDAVOptions,
+                                                          m_nOptsCacheLifeNotFound );
+                    if ( networkAccessAllowed != nullptr )
+                    {
+                        *networkAccessAllowed = *networkAccessAllowed
+                            && shouldAccessNetworkAfterException(e);
+                    }
+                }
+                break;
+                case DAVException::DAV_HTTP_NOAUTH:
+                case DAVException::DAV_HTTP_AUTH:
+                {
+                    SAL_WARN( "ucb.ucp.webdav", "OPTIONS - DAVException: DAV_HTTP_AUTH for URL <" << m_xIdentifier->getContentIdentifier() << ">" );
+                    // - the remote site is a WebDAV with special configuration: read/only for read operations
+                    //   and read/write for write operations, the user is not allowed to lock/write and
+                    //   she cancelled the credentials request.
+                    //   this is not actually an error, it means only that for current user this is a standard web,
+                    //   though possibly DAV enabled
+                    aDAVOptions.setHttpResponseStatusCode( USC_AUTH_FAILED );
+                    // used only internally, so the text doesn't really matter..
+                    if (xEnv && xEnv->getInteractionHandler())
+                    {   // only cache if there actually was a chance to request auth
+                        aStaticDAVOptionsCache.addDAVOptions( aDAVOptions,
+                                                              m_nOptsCacheLifeNotFound );
+                    }
+                    if ( networkAccessAllowed != nullptr )
+                    {
+                        *networkAccessAllowed = *networkAccessAllowed
+                            && shouldAccessNetworkAfterException(e);
+                    }
+                }
+                break;
+                case DAVException::DAV_HTTP_AUTHPROXY:
+                {
+                    SAL_WARN( "ucb.ucp.webdav", "OPTIONS - DAVException: DAV_HTTP_AUTHPROXY for URL <" << m_xIdentifier->getContentIdentifier() << ">" );
+                    aDAVOptions.setHttpResponseStatusCode( USC_AUTHPROXY_FAILED );
+                    // used only internally, so the text doesn't really matter..
+                    aStaticDAVOptionsCache.addDAVOptions( aDAVOptions,
+                                                          m_nOptsCacheLifeNotFound );
+                    if ( networkAccessAllowed != nullptr )
+                    {
+                        *networkAccessAllowed = *networkAccessAllowed
+                            && shouldAccessNetworkAfterException(e);
+                    }
+                }
+                break;
+                case DAVException::DAV_HTTP_ERROR:
+                {
+                    switch( e.getStatus() )
+                    {
+                        case SC_FORBIDDEN:
+                        {
+                            SAL_WARN( "ucb.ucp.webdav","OPTIONS - SC_FORBIDDEN for URL <" << m_xIdentifier->getContentIdentifier() << ">" );
+                            // cache it, so OPTIONS won't be called again, this URL does not support it
+                            aStaticDAVOptionsCache.addDAVOptions( aDAVOptions,
+                                                                  m_nOptsCacheLifeNotImpl );
+                        }
+                        break;
+                        case SC_BAD_REQUEST:
+                        case SC_INTERNAL_SERVER_ERROR:
+                        {
+                            SAL_WARN( "ucb.ucp.webdav","OPTIONS - SC_BAD_REQUEST or SC_INTERNAL_SERVER_ERROR for URL <" << m_xIdentifier->getContentIdentifier() << ">, HTTP error: "<< e.getStatus()
+                                      << ", '" << e.getData() << "'" );
+                            // cache it, so OPTIONS won't be called again, this URL detect some problem while answering the method
+                            aDAVOptions.setHttpResponseStatusCode( e.getStatus() );
+                            aDAVOptions.setHttpResponseStatusText( e.getData() );
+                            aStaticDAVOptionsCache.addDAVOptions( aDAVOptions,
+                                                                  m_nOptsCacheLifeNotFound );
+                        }
+                        break;
+                        case SC_NOT_IMPLEMENTED:
+                        case SC_METHOD_NOT_ALLOWED:
+                        {
+                            // OPTIONS method must be implemented in DAV
+                            // resource is NON_DAV, or not advertising it
+                            SAL_WARN( "ucb.ucp.webdav","OPTIONS - SC_NOT_IMPLEMENTED or SC_METHOD_NOT_ALLOWED for URL <" << m_xIdentifier->getContentIdentifier() << ">, HTTP error: "<< e.getStatus()
+                                      << ", '" << e.getData() << "'" );
+                            // cache it, so OPTIONS won't be called again, this URL does not support it
+                            aStaticDAVOptionsCache.addDAVOptions( aDAVOptions,
+                                                                  m_nOptsCacheLifeNotImpl );
+                        }
+                        break;
+                        case SC_NOT_FOUND:
+                        {
+                            // Apparently on IIS 10.0, if you disabled OPTIONS method, this error is the one reported,
+                            // instead of SC_NOT_IMPLEMENTED or SC_METHOD_NOT_ALLOWED.
+                            // So check if this is an available resource, or a real 'Not Found' event.
+                            sal_uInt32 nLifeTime = m_nOptsCacheLifeNotFound;
+                            if( isResourceAvailable( xEnv, rResAccess, aDAVOptions ) )
+                            {
+                                SAL_WARN( "ucb.ucp.webdav", "OPTIONS - Got an SC_NOT_FOUND, but the URL <" << m_xIdentifier->getContentIdentifier() << "> resource exists" );
+                                nLifeTime = m_nOptsCacheLifeNotImpl;
+                            }
+                            else
+                            {
+                                SAL_WARN( "ucb.ucp.webdav", "OPTIONS - SC_NOT_FOUND for URL <" << m_xIdentifier->getContentIdentifier() << ">" );
+                                if ( networkAccessAllowed != nullptr )
+                                {
+                                    *networkAccessAllowed = *networkAccessAllowed
+                                        && shouldAccessNetworkAfterException(e);
+                                }
+                            }
+                            aStaticDAVOptionsCache.addDAVOptions( aDAVOptions,
+                                                                  nLifeTime );
+                        }
+                        break;
+                        default:
+                        {
+                            SAL_WARN( "ucb.ucp.webdav", "OPTIONS - DAV_HTTP_ERROR, for URL <" << m_xIdentifier->getContentIdentifier() << ">, HTTP error: "<< e.getStatus()
+                                      << ", '" << e.getData() << "'" );
+                            aDAVOptions.setHttpResponseStatusCode( e.getStatus() );
+                            aDAVOptions.setHttpResponseStatusText( e.getData() );
+                            // cache it, so OPTIONS won't be called again, this URL does not support it
+                            aStaticDAVOptionsCache.addDAVOptions( aDAVOptions,
+                                                                  m_nOptsCacheLifeNotImpl );
+                        }
+                        break;
+                    }
+                }
+                break;
+                // The 'DAVException::DAV_HTTP_REDIRECT' means we reached the maximum
+                // number of redirections, consider the resource type as UNKNOWN
+                // possibly a normal web site, not DAV
+                case DAVException::DAV_HTTP_REDIRECT:
+                default:
+                {
+                    SAL_WARN( "ucb.ucp.webdav","OPTIONS - General DAVException (or max DAV_HTTP_REDIRECT reached) for URL <" << m_xIdentifier->getContentIdentifier() << ">, DAV ExceptionCode: "
+                              << e.getError() << ", HTTP error: "<< e.getStatus() );
+                    aStaticDAVOptionsCache.addDAVOptions( aDAVOptions,
+                                                          m_nOptsCacheLifeNotImpl );
+                }
+                break;
+            }
+        }
+    }
+    else
+    {
+        // check current response status code, perhaps we need to set networkAccessAllowed
+        sal_uInt16 CachedResponseStatusCode = aDAVOptions.getHttpResponseStatusCode();
+        if ( networkAccessAllowed != nullptr &&
+             ( ( CachedResponseStatusCode == SC_NOT_FOUND ) ||
+               ( CachedResponseStatusCode == SC_GONE ) ||
+               ( CachedResponseStatusCode == USC_CONNECTION_TIMED_OUT ) ||
+               ( CachedResponseStatusCode == USC_LOOKUP_FAILED ) ||
+               ( CachedResponseStatusCode == USC_AUTH_FAILED ) ||
+               ( CachedResponseStatusCode == USC_AUTHPROXY_FAILED )
+                 )
+            )
+        {
+            *networkAccessAllowed = *networkAccessAllowed && false;
+        }
+    }
+    rDAVOptions = aDAVOptions;
+}
+
+//static
+bool Content::isResourceAvailable( const css::uno::Reference< css::ucb::XCommandEnvironment >& xEnv,
+                                  const std::unique_ptr< DAVResourceAccess > & rResAccess,
+                                  DAVOptions& rDAVOptions )
+{
+    std::vector< rtl::OUString > aHeaderNames;
+    DAVResource aResource;
+
+    try
+    {
+        // To check for the physical URL resource availability, first
+        // try using a simple HEAD command
+        // if HEAD is successful, set element found.
+        rResAccess->HEAD( aHeaderNames, aResource, xEnv );
+        rDAVOptions.setHttpResponseStatusCode( 0 );
+        rDAVOptions.setHttpResponseStatusText("");
+        return true;
+    }
+    catch ( DAVException const & e )
+    {
+        if ( e.getError() == DAVException::DAV_HTTP_ERROR )
+        {
+            if ( e.getStatus() == SC_NOT_IMPLEMENTED ||
+                 e.getStatus() == SC_METHOD_NOT_ALLOWED ||
+                 e.getStatus() == SC_NOT_FOUND )
+            {
+                SAL_WARN( "ucb.ucp.webdav", "HEAD probably not implemented: fall back to a partial GET" );
+                // set in cached OPTIONS "HEAD not implemented"
+                // so it won't be used again on this resource
+                rDAVOptions.setHeadAllowed( false );
+                try
+                {
+                    // do a GET with a payload of 0, the server does not
+                    // support HEAD (or has HEAD disabled)
+                    DAVRequestHeaders aPartialGet;
+                    aPartialGet.push_back(
+                        DAVRequestHeader(
+                            OUString( "Range" ),
+                            OUString( "bytes=0-0" )));
+
+                    rResAccess->GET0( aPartialGet,
+                                     aHeaderNames,
+                                     aResource,
+                                     xEnv );
+                    return true;
+                }
+                catch ( DAVException const & ex )
+                {
+                    if ( ex.getError() == DAVException::DAV_HTTP_ERROR )
+                    {
+                        rDAVOptions.setHttpResponseStatusCode( ex.getStatus() );
+                        rDAVOptions.setHttpResponseStatusText( ex.getData() );
+                    }
+                }
+            }
+            else
+            {
+                rDAVOptions.setHttpResponseStatusCode( e.getStatus() );
+                rDAVOptions.setHttpResponseStatusText( e.getData() );
+            }
+        }
+        return false;
+    }
+    catch ( ... )
+    {
+    }
+    // set SC_NOT_IMPLEMENTED since at a minimum GET must be implemented in a basic Web server
+    rDAVOptions.setHttpResponseStatusCode( SC_NOT_IMPLEMENTED );
+    rDAVOptions.setHttpResponseStatusText("");
+    return false;
+}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/webdavcontent.hxx b/ucb/source/ucp/webdav-curl/webdavcontent.hxx
new file mode 100644
index 000000000..a44eb1c99
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/webdavcontent.hxx
@@ -0,0 +1,305 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#pragma once
+
+#include <memory>
+#include <list>
+#include <rtl/ref.hxx>
+#include <com/sun/star/ucb/ContentCreationException.hpp>
+#include <com/sun/star/ucb/XContentCreator.hpp>
+#include <ucbhelper/contenthelper.hxx>
+#include "DAVResourceAccess.hxx"
+#include "PropertyMap.hxx"
+
+namespace com::sun::star::beans {
+    struct Property;
+    struct PropertyValue;
+}
+
+namespace com::sun::star::io {
+    class XInputStream;
+}
+
+namespace com::sun::star::sdbc {
+    class XRow;
+}
+
+namespace com::sun::star::ucb {
+    struct OpenCommandArgument3;
+    struct PropertyCommandArgument;
+    struct PostCommandArgument2;
+    struct TransferInfo;
+}
+
+namespace http_dav_ucp
+{
+
+
+// UNO service name for the content.
+inline constexpr OUStringLiteral WEBDAV_CONTENT_SERVICE_NAME = u"com.sun.star.ucb.WebDAVContent";
+
+
+class ContentProvider;
+class ContentProperties;
+class CachableContentProperties;
+
+class Content : public ::ucbhelper::ContentImplHelper,
+                public css::ucb::XContentCreator
+{
+    enum ResourceType
+    {
+        UNKNOWN,    // the type of the Web resource is unknown
+        NOT_FOUND,  // the Web resource does not exists
+        NON_DAV,    // the Web resource exists but it's not DAV
+        DAV,        // the type of the Web resource is DAV with lock/unlock available
+        DAV_NOLOCK  // the type of the Web resource is DAV with no lock/unlock available
+    };
+
+    std::unique_ptr< DAVResourceAccess > m_xResAccess;
+    std::unique_ptr< CachableContentProperties > m_xCachedProps; // locally cached props
+    OUString     m_aEscapedTitle;
+    // resource type for general DAV methods
+    ResourceType      m_eResourceType;
+    // resource type for general LOCK method only
+    ResourceType      m_eResourceTypeForLocks;
+    ContentProvider*  m_pProvider; // No need for a ref, base class holds object
+    bool              m_bTransient;
+    bool const        m_bCollection;
+    bool              m_bDidGetOrHead;
+    std::vector< OUString > m_aFailedPropNames;
+    // Options Cache lifetime
+    // for web site implementing OPTIONS, but not dav
+    sal_uInt32 m_nOptsCacheLifeImplWeb;
+    // for WebDAV site where OPTIONS is mandatory
+    sal_uInt32 m_nOptsCacheLifeDAV;
+    // same as above, but when the resource is locked by us
+    sal_uInt32 m_nOptsCacheLifeDAVLocked;
+// For web site not implementing OPTIONS
+    // during this time we assume the site doesn't turn to WebDAV
+    // but remains a simple Web
+    sal_uInt32 m_nOptsCacheLifeNotImpl;
+    // When resource is not found
+    // may be the resource is unavailable only briefly?
+    // so better have this small
+    sal_uInt32 m_nOptsCacheLifeNotFound;
+
+    void initOptsCacheLifeTime();
+
+private:
+    virtual css::uno::Sequence< css::beans::Property >
+    getProperties( const css::uno::Reference< css::ucb::XCommandEnvironment > & xEnv ) override;
+    virtual css::uno::Sequence< css::ucb::CommandInfo >
+    getCommands( const css::uno::Reference< css::ucb::XCommandEnvironment > & xEnv ) override;
+    virtual OUString getParentURL() override;
+
+    /// @throws css::uno::Exception
+    bool isFolder( const css::uno::Reference< css::ucb::XCommandEnvironment >& xEnv );
+
+    /// @throws css::uno::Exception
+    css::uno::Reference< css::sdbc::XRow >
+    getPropertyValues( const css::uno::Sequence< css::beans::Property >& rProperties,
+                       const css::uno::Reference< css::ucb::XCommandEnvironment >& xEnv );
+
+    /// @throws css::uno::Exception
+    css::uno::Sequence< css::uno::Any >
+    setPropertyValues( const css::uno::Sequence< css::beans::PropertyValue >& rValues,
+                       const css::uno::Reference< css::ucb::XCommandEnvironment >& xEnv );
+
+    typedef rtl::Reference< Content > ContentRef;
+    typedef std::vector< ContentRef > ContentRefList;
+    void queryChildren( ContentRefList& rChildren);
+
+    bool
+    exchangeIdentity( const css::uno::Reference< css::ucb::XContentIdentifier >& xNewId );
+
+    OUString
+    getBaseURI( const std::unique_ptr< DAVResourceAccess > & rResAccess );
+
+    /// @throws css::uno::Exception
+    ResourceType
+    getResourceType( const css::uno::Reference< css::ucb::XCommandEnvironment >& xEnv );
+
+    /// @throws css::uno::Exception
+    ResourceType
+    getResourceType( const css::uno::Reference< css::ucb::XCommandEnvironment >& xEnv,
+                     const std::unique_ptr< DAVResourceAccess > & rResAccess,
+                     bool * networkAccessAllowed = nullptr );
+
+    // Command "open"
+    /// @throws css::uno::Exception
+    css::uno::Any open(
+                const css::ucb::OpenCommandArgument3 & rArg,
+                const css::uno::Reference<
+                    css::ucb::XCommandEnvironment > & xEnv );
+
+    // Command "post"
+    /// @throws css::uno::Exception
+    void post( const css::ucb::PostCommandArgument2 & rArg,
+               const css::uno::Reference< css::ucb::XCommandEnvironment > & xEnv );
+
+    // Command "insert"
+    /// @throws css::uno::Exception
+    void insert( const css::uno::Reference< css::io::XInputStream > & xInputStream,
+                 bool bReplaceExisting,
+                 const css::uno::Reference< css::ucb::XCommandEnvironment >& Environment );
+
+    // Command "transfer"
+    /// @throws css::uno::Exception
+    void transfer( const css::ucb::TransferInfo & rArgs,
+                   const css::uno::Reference< css::ucb::XCommandEnvironment >& Environment );
+
+    // Command "delete"
+    /// @throws css::uno::Exception
+    void destroy( bool bDeletePhysical );
+
+    // Command "lock"
+    /// @throws css::uno::Exception
+    void lock( const css::uno::Reference< css::ucb::XCommandEnvironment >& Environment );
+
+    // Command "unlock"
+    /// @throws css::uno::Exception
+    void unlock( const css::uno::Reference< css::ucb::XCommandEnvironment >& Environment );
+
+    css::uno::Any MapDAVException( const DAVException & e,
+                                                bool bWrite );
+    /// @throws css::uno::Exception
+    void cancelCommandExecution(
+                    const DAVException & e,
+                    const css::uno::Reference< css::ucb::XCommandEnvironment > & xEnv,
+                    bool bWrite = false );
+
+    static bool shouldAccessNetworkAfterException( const DAVException & e );
+
+    ResourceType resourceTypeForLocks(
+        const css::uno::Reference< css::ucb::XCommandEnvironment >& rEnvironment,
+        const std::unique_ptr< DAVResourceAccess > & rResAccess );
+
+    ResourceType resourceTypeForLocks(
+        const css::uno::Reference< css::ucb::XCommandEnvironment >& rEnvironment );
+
+    // XPropertyContainer replacement
+    /// @throws css::beans::PropertyExistException
+    /// @throws css::beans::IllegalTypeException
+    /// @throws css::lang::IllegalArgumentException
+    /// @throws css::uno::RuntimeException
+    void addProperty( const css::ucb::PropertyCommandArgument &aCmdArg,
+                      const css::uno::Reference< css::ucb::XCommandEnvironment >& Environment );
+
+    /// @throws css::beans::PropertyExistException
+    /// @throws css::beans::NotRemoveableException
+    /// @throws css::uno::RuntimeException
+    void removeProperty( const OUString& Name,
+                         const css::uno::Reference< css::ucb::XCommandEnvironment >& Environment );
+public:
+    /// @throws css::ucb::ContentCreationException
+    Content( const css::uno::Reference< css::uno::XComponentContext >& rxContext,
+             ContentProvider* pProvider,
+             const css::uno::Reference< css::ucb::XContentIdentifier >& Identifier,
+             rtl::Reference< DAVSessionFactory > const & rSessionFactory );
+    /// @throws css::ucb::ContentCreationException
+    Content( const css::uno::Reference< css::uno::XComponentContext >& rxContext,
+             ContentProvider* pProvider,
+             const css::uno::Reference< css::ucb::XContentIdentifier >& Identifier,
+             rtl::Reference< DAVSessionFactory > const & rSessionFactory,
+             bool isCollection );
+    virtual ~Content() override;
+
+    // XInterface
+    virtual css::uno::Any SAL_CALL queryInterface( const css::uno::Type & rType ) override;
+    virtual void SAL_CALL acquire()
+        noexcept override;
+    virtual void SAL_CALL release()
+        noexcept override;
+
+    // XTypeProvider
+    virtual css::uno::Sequence< sal_Int8 > SAL_CALL getImplementationId() override;
+    virtual css::uno::Sequence< css::uno::Type > SAL_CALL getTypes() override;
+
+    // XServiceInfo
+    virtual OUString SAL_CALL
+    getImplementationName() override;
+
+    virtual css::uno::Sequence< OUString > SAL_CALL
+    getSupportedServiceNames() override;
+
+    // XContent
+    virtual OUString SAL_CALL
+    getContentType() override;
+
+    // XCommandProcessor
+    virtual css::uno::Any SAL_CALL
+    execute( const css::ucb::Command& aCommand,
+             sal_Int32 CommandId,
+             const css::uno::Reference< css::ucb::XCommandEnvironment >& Environment ) override;
+    virtual void SAL_CALL
+    abort( sal_Int32 CommandId ) override;
+
+    // XPropertyContainer
+    virtual void SAL_CALL
+    addProperty( const OUString& Name,
+                 sal_Int16 Attributes,
+                 const css::uno::Any& DefaultValue ) override;
+
+    virtual void SAL_CALL
+    removeProperty( const OUString& Name ) override;
+
+
+    // Additional interfaces
+
+
+    // XContentCreator
+    virtual css::uno::Sequence< css::ucb::ContentInfo > SAL_CALL
+   queryCreatableContentsInfo() override;
+    virtual css::uno::Reference< css::ucb::XContent > SAL_CALL
+    createNewContent( const css::ucb::ContentInfo& Info ) override;
+
+
+    // Non-interface methods.
+
+
+    DAVResourceAccess & getResourceAccess() { return *m_xResAccess; }
+
+    // Called from resultset data supplier.
+    static css::uno::Reference< css::sdbc::XRow >
+    getPropertyValues( const css::uno::Reference< css::uno::XComponentContext >& rContext,
+                       const css::uno::Sequence< css::beans::Property >& rProperties,
+                       const ContentProperties& rData,
+                       const rtl::Reference< ::ucbhelper::ContentProviderImplHelper >& rProvider,
+                       const OUString& rContentId );
+
+    /// Use OPTIONS method to retrieve the type of the Web resource
+    /// @throws css::uno::Exception
+    void getResourceOptions( const css::uno::Reference< css::ucb::XCommandEnvironment >& xEnv,
+                             DAVOptions& rDAVOptions,
+                             const std::unique_ptr< DAVResourceAccess > & rResAccess,
+                             bool * networkAccessAllowed = nullptr);
+
+    static bool isResourceAvailable( const css::uno::Reference< css::ucb::XCommandEnvironment >& xEnv,
+                             const std::unique_ptr< DAVResourceAccess > & rResAccess,
+                                     DAVOptions& rDAVOptions );
+
+    static void removeCachedPropertyNames( const OUString & rURL );
+
+};
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/webdavcontentcaps.cxx b/ucb/source/ucp/webdav-curl/webdavcontentcaps.cxx
new file mode 100644
index 000000000..a7e2bb968
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/webdavcontentcaps.cxx
@@ -0,0 +1,636 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <memory>
+#include <set>
+#include <com/sun/star/beans/Property.hpp>
+#include <com/sun/star/beans/PropertyAttribute.hpp>
+#include <com/sun/star/beans/PropertyValue.hpp>
+#include <com/sun/star/ucb/CommandInfo.hpp>
+#include <com/sun/star/ucb/ContentInfo.hpp>
+#include <com/sun/star/ucb/OpenCommandArgument2.hpp>
+#include <com/sun/star/ucb/InsertCommandArgument.hpp>
+#include <com/sun/star/ucb/PostCommandArgument2.hpp>
+#include <com/sun/star/ucb/PropertyCommandArgument.hpp>
+#include <com/sun/star/ucb/TransferInfo.hpp>
+#include <com/sun/star/uno/Sequence.hxx>
+#include <com/sun/star/util/DateTime.hpp>
+#include <com/sun/star/ucb/Lock.hpp>
+#include <com/sun/star/ucb/LockEntry.hpp>
+#include "webdavcontent.hxx"
+#include "webdavprovider.hxx"
+#include "DAVProperties.hxx"
+#include "ContentProperties.hxx"
+#include "PropfindCache.hxx"
+
+using namespace com::sun::star;
+using namespace http_dav_ucp;
+
+
+// ContentProvider implementation.
+
+
+bool ContentProvider::getProperty(
+        const OUString & rPropName, beans::Property & rProp )
+{
+    if ( !m_pProps )
+    {
+        osl::MutexGuard aGuard( m_aMutex );
+        if ( !m_pProps )
+        {
+            m_pProps = std::make_unique<PropertyMap>();
+
+
+            // Fill map of known properties...
+
+
+            // Mandatory UCB properties.
+            m_pProps->insert(
+                beans::Property(
+                    "ContentType",
+                    -1,
+                    cppu::UnoType<OUString>::get(),
+                    beans::PropertyAttribute::BOUND
+                        | beans::PropertyAttribute::READONLY ) );
+
+            m_pProps->insert(
+                beans::Property(
+                    "IsDocument",
+                    -1,
+                    cppu::UnoType<bool>::get(),
+                    beans::PropertyAttribute::BOUND
+                        | beans::PropertyAttribute::READONLY ) );
+
+            m_pProps->insert(
+                beans::Property(
+                    "IsFolder",
+                    -1,
+                    cppu::UnoType<bool>::get(),
+                    beans::PropertyAttribute::BOUND
+                        | beans::PropertyAttribute::READONLY ) );
+
+            m_pProps->insert(
+                beans::Property(
+                    "Title",
+                    -1,
+                    cppu::UnoType<OUString>::get(),
+                    beans::PropertyAttribute::BOUND ) );
+
+            // Optional UCB properties.
+
+            m_pProps->insert(
+                beans::Property(
+                    "DateCreated",
+                    -1,
+                    cppu::UnoType<util::DateTime>::get(),
+                    beans::PropertyAttribute::BOUND
+                        | beans::PropertyAttribute::READONLY ) );
+
+            m_pProps->insert(
+                beans::Property(
+                    "DateModified",
+                    -1,
+                    cppu::UnoType<util::DateTime>::get(),
+                    beans::PropertyAttribute::BOUND
+                        | beans::PropertyAttribute::READONLY ) );
+
+            m_pProps->insert(
+                beans::Property(
+                    "MediaType",
+                    -1,
+                    cppu::UnoType<OUString>::get(),
+                    beans::PropertyAttribute::BOUND
+                        | beans::PropertyAttribute::READONLY ) );
+
+            m_pProps->insert(
+                beans::Property(
+                    "Size",
+                    -1,
+                    cppu::UnoType<sal_Int64>::get(),
+                    beans::PropertyAttribute::BOUND
+                        | beans::PropertyAttribute::READONLY ) );
+
+            m_pProps->insert(
+                beans::Property(
+                    "BaseURI",
+                    -1,
+                    cppu::UnoType<OUString>::get(),
+                    beans::PropertyAttribute::BOUND
+                        | beans::PropertyAttribute::READONLY ) );
+
+            m_pProps->insert(
+                beans::Property(
+                    "CreatableContentsInfo",
+                    -1,
+                    cppu::UnoType<uno::Sequence< ucb::ContentInfo >>::get(),
+                    beans::PropertyAttribute::BOUND
+                        | beans::PropertyAttribute::READONLY ) );
+
+            // Standard DAV properties.
+
+            m_pProps->insert(
+                beans::Property(
+                    DAVProperties::CREATIONDATE,
+                    -1,
+                    cppu::UnoType<OUString>::get(),
+                    beans::PropertyAttribute::BOUND
+                        | beans::PropertyAttribute::READONLY ) );
+
+            m_pProps->insert(
+                beans::Property(
+                    DAVProperties::DISPLAYNAME,
+                    -1,
+                    cppu::UnoType<OUString>::get(),
+                    beans::PropertyAttribute::BOUND ) );
+
+            m_pProps->insert(
+                beans::Property(
+                    DAVProperties::GETCONTENTLANGUAGE,
+                    -1,
+                    cppu::UnoType<OUString>::get(),
+                    beans::PropertyAttribute::BOUND
+                        | beans::PropertyAttribute::READONLY ) );
+
+            m_pProps->insert(
+                beans::Property(
+                    DAVProperties::GETCONTENTLENGTH,
+                    -1,
+                    cppu::UnoType<OUString>::get(),
+                    beans::PropertyAttribute::BOUND
+                        | beans::PropertyAttribute::READONLY ) );
+
+            m_pProps->insert(
+                beans::Property(
+                    DAVProperties::GETCONTENTTYPE ,
+                    -1,
+                    cppu::UnoType<OUString>::get(),
+                    beans::PropertyAttribute::BOUND
+                        | beans::PropertyAttribute::READONLY ) );
+
+            m_pProps->insert(
+                beans::Property(
+                    DAVProperties::GETETAG,
+                    -1,
+                    cppu::UnoType<OUString>::get(),
+                    beans::PropertyAttribute::BOUND
+                        | beans::PropertyAttribute::READONLY ) );
+
+            m_pProps->insert(
+                beans::Property(
+                    DAVProperties::GETLASTMODIFIED,
+                    -1,
+                    cppu::UnoType<OUString>::get(),
+                    beans::PropertyAttribute::BOUND
+                        | beans::PropertyAttribute::READONLY ) );
+
+            m_pProps->insert(
+                beans::Property(
+                    DAVProperties::LOCKDISCOVERY,
+                    -1,
+                    cppu::UnoType<uno::Sequence< ucb::Lock >>::get(),
+                    beans::PropertyAttribute::BOUND
+                        | beans::PropertyAttribute::READONLY ) );
+
+            m_pProps->insert(
+                beans::Property(
+                    DAVProperties::RESOURCETYPE,
+                    -1,
+                    cppu::UnoType<OUString>::get(),
+                    beans::PropertyAttribute::BOUND
+                        | beans::PropertyAttribute::READONLY ) );
+
+            m_pProps->insert(
+                beans::Property(
+                    DAVProperties::SUPPORTEDLOCK,
+                    -1,
+                    cppu::UnoType<uno::Sequence< ucb::LockEntry >>::get(),
+                    beans::PropertyAttribute::BOUND
+                        | beans::PropertyAttribute::READONLY ) );
+
+            m_pProps->insert(
+                beans::Property(
+                    DAVProperties::EXECUTABLE,
+                    -1,
+                    cppu::UnoType<OUString>::get(),
+                    beans::PropertyAttribute::BOUND ) );
+        }
+    }
+
+
+    // Lookup property.
+
+
+    beans::Property aProp;
+    aProp.Name = rPropName;
+    const PropertyMap::const_iterator it = m_pProps->find( aProp );
+    if ( it != m_pProps->end() )
+    {
+        rProp = *it;
+    }
+    else
+    {
+        // All unknown props are treated as:
+        rProp = beans::Property(
+                    rPropName,
+                    - 1,
+                    cppu::UnoType<OUString>::get(),
+                    beans::PropertyAttribute::BOUND );
+    }
+
+    return true;
+}
+
+
+static PropertyNamesCache aStaticPropertyNamesCache;
+
+// static
+void Content::removeCachedPropertyNames( const OUString & rURL )
+{
+    aStaticPropertyNamesCache.removeCachedPropertyNames( rURL );
+}
+
+// Content implementation.
+
+
+// virtual
+uno::Sequence< beans::Property > Content::getProperties(
+    const uno::Reference< ucb::XCommandEnvironment > & xEnv )
+{
+    bool bTransient;
+    std::unique_ptr< DAVResourceAccess > xResAccess;
+    std::unique_ptr< ContentProperties > xCachedProps;
+    rtl::Reference< ContentProvider >  xProvider;
+
+    {
+        osl::Guard< osl::Mutex > aGuard( m_aMutex );
+
+        bTransient = m_bTransient;
+        xResAccess.reset( new DAVResourceAccess( *m_xResAccess ) );
+        if (m_xCachedProps)
+            xCachedProps.reset(
+                new ContentProperties( *m_xCachedProps ) );
+        xProvider.set( m_pProvider );
+    }
+
+    std::set< OUString > aPropSet;
+
+    // No server access for just created (not yet committed) objects.
+    // Only a minimal set of properties supported at this stage.
+    if ( !bTransient )
+    {
+        // Obtain all properties supported for this resource from server.
+        DAVOptions aDAVOptions;
+        getResourceOptions( xEnv, aDAVOptions, xResAccess );
+        // only Class 1 is needed for PROPFIND
+        if ( aDAVOptions.isClass1() )
+        {
+            try
+            {
+                std::vector< DAVResourceInfo > props;
+                OUString aTheURL( xResAccess->getURL() );
+                PropertyNames aPropsNames( aTheURL );
+
+                if( !aStaticPropertyNamesCache.getCachedPropertyNames( aTheURL, aPropsNames ) )
+                {
+
+                    xResAccess->PROPFIND( DAVZERO, props, xEnv );
+                    aPropsNames.setPropertiesNames( props );
+
+                    aStaticPropertyNamesCache.addCachePropertyNames( aPropsNames, 10 );
+                }
+                else
+                {
+                    props = aPropsNames.getPropertiesNames();
+                }
+
+                // Note: vector should contain exactly one resource info, because
+                //       we used a depth of DAVZERO for PROPFIND.
+                if (props.size() == 1)
+                {
+                    aPropSet.insert( (*props.begin()).properties.begin(),
+                                     (*props.begin()).properties.end() );
+                }
+            }
+            catch ( DAVException const & )
+            {
+            }
+        }
+    }
+
+    // Add DAV properties, map DAV properties to UCB properties.
+    bool bHasCreationDate     = false; // creationdate     <-> DateCreated
+    bool bHasGetLastModified  = false; // getlastmodified  <-> DateModified
+    bool bHasGetContentType   = false; // getcontenttype   <-> MediaType
+    bool bHasGetContentLength = false; // getcontentlength <-> Size
+
+    bool bHasContentType      = false;
+    bool bHasIsDocument       = false;
+    bool bHasIsFolder         = false;
+    bool bHasTitle            = false;
+    bool bHasBaseURI          = false;
+    bool bHasDateCreated      = false;
+    bool bHasDateModified     = false;
+    bool bHasMediaType        = false;
+    bool bHasSize             = false;
+    bool bHasCreatableInfos   = false;
+
+    {
+        for ( const auto& rProp : aPropSet )
+        {
+            if ( !bHasCreationDate &&
+                 ( rProp == DAVProperties::CREATIONDATE ) )
+            {
+                bHasCreationDate = true;
+            }
+            else if ( !bHasGetLastModified &&
+                      ( rProp == DAVProperties::GETLASTMODIFIED ) )
+            {
+                bHasGetLastModified = true;
+            }
+            else if ( !bHasGetContentType &&
+                      ( rProp == DAVProperties::GETCONTENTTYPE ) )
+            {
+                bHasGetContentType = true;
+            }
+            else if ( !bHasGetContentLength &&
+                      ( rProp == DAVProperties::GETCONTENTLENGTH ) )
+            {
+                bHasGetContentLength = true;
+            }
+            else if ( !bHasContentType && rProp == "ContentType" )
+            {
+                bHasContentType = true;
+            }
+            else if ( !bHasIsDocument && rProp == "IsDocument" )
+            {
+                bHasIsDocument = true;
+            }
+            else if ( !bHasIsFolder && rProp == "IsFolder" )
+            {
+                bHasIsFolder = true;
+            }
+            else if ( !bHasTitle && rProp == "Title" )
+            {
+                bHasTitle = true;
+            }
+            else if ( !bHasBaseURI && rProp == "BaseURI" )
+            {
+                bHasBaseURI = true;
+            }
+            else if ( !bHasDateCreated && rProp == "DateCreated" )
+            {
+                bHasDateCreated = true;
+            }
+            else if ( !bHasDateModified && rProp == "DateModified" )
+            {
+                bHasDateModified = true;
+            }
+            else if ( !bHasMediaType && rProp == "MediaType" )
+            {
+                bHasMediaType = true;
+            }
+            else if ( !bHasSize && rProp == "Size" )
+            {
+                bHasSize = true;
+            }
+            else if ( !bHasCreatableInfos && rProp == "CreatableContentsInfo" )
+            {
+                bHasCreatableInfos = true;
+            }
+        }
+    }
+
+    // Add mandatory properties.
+    if ( !bHasContentType )
+        aPropSet.insert(
+            OUString( "ContentType" ) );
+
+    if ( !bHasIsDocument )
+        aPropSet.insert(
+            OUString( "IsDocument" ) );
+
+    if ( !bHasIsFolder )
+        aPropSet.insert(
+            OUString( "IsFolder" ) );
+
+    if ( !bHasTitle )
+    {
+        // Always present since it can be calculated from content's URI.
+        aPropSet.insert(
+            OUString( "Title" ) );
+    }
+
+    // Add optional properties.
+
+    if ( !bHasBaseURI )
+    {
+        // Always present since it can be calculated from content's URI.
+        aPropSet.insert(
+            OUString( "BaseURI" ) );
+    }
+
+    if ( !bHasDateCreated && bHasCreationDate )
+        aPropSet.insert(
+            OUString( "DateCreated" ) );
+
+    if ( !bHasDateModified && bHasGetLastModified )
+        aPropSet.insert(
+            OUString( "DateModified" ) );
+
+    if ( !bHasMediaType && bHasGetContentType )
+        aPropSet.insert(
+            OUString( "MediaType" ) );
+
+    if ( !bHasSize && bHasGetContentLength )
+        aPropSet.insert(
+            OUString( "Size" ) );
+
+    if ( !bHasCreatableInfos )
+        aPropSet.insert(
+            OUString(
+                "CreatableContentsInfo" ) );
+
+    // Add cached properties, if present and still missing.
+    if (xCachedProps)
+    {
+        const std::unique_ptr< PropertyValueMap > & xProps
+            = xCachedProps->getProperties();
+
+        for ( const auto& rEntry : *xProps )
+            aPropSet.insert( rEntry.first );
+    }
+
+    // std::set -> uno::Sequence
+    sal_Int32 nCount = aPropSet.size();
+    uno::Sequence< beans::Property > aProperties( nCount );
+    auto aPropertiesRange = asNonConstRange(aProperties);
+
+    beans::Property aProp;
+    sal_Int32 n = 0;
+
+    for ( const auto& rProp : aPropSet )
+    {
+        xProvider->getProperty( rProp, aProp );
+        aPropertiesRange[ n++ ] = aProp;
+    }
+
+    return aProperties;
+}
+
+
+// virtual
+uno::Sequence< ucb::CommandInfo > Content::getCommands(
+    const uno::Reference< ucb::XCommandEnvironment > & xEnv )
+{
+    osl::Guard< osl::Mutex > aGuard( m_aMutex );
+
+    uno::Sequence< ucb::CommandInfo > aCmdInfo( 10 );
+    auto pCmdInfo = aCmdInfo.getArray();
+
+
+    // Mandatory commands
+
+
+    pCmdInfo[ 0 ] =
+            ucb::CommandInfo(
+                "getCommandInfo",
+                -1,
+                cppu::UnoType<void>::get() );
+    pCmdInfo[ 1 ] =
+            ucb::CommandInfo(
+                "getPropertySetInfo",
+                -1,
+                cppu::UnoType<void>::get() );
+    pCmdInfo[ 2 ] =
+            ucb::CommandInfo(
+                "getPropertyValues",
+                -1,
+                cppu::UnoType<uno::Sequence< beans::Property >>::get());
+    pCmdInfo[ 3 ] =
+            ucb::CommandInfo(
+                "setPropertyValues",
+                -1,
+                cppu::UnoType<uno::Sequence< beans::PropertyValue >>::get());
+
+
+    // Optional standard commands
+
+
+    pCmdInfo[ 4 ] =
+            ucb::CommandInfo(
+                "delete",
+                -1,
+                cppu::UnoType<bool>::get() );
+    pCmdInfo[ 5 ] =
+            ucb::CommandInfo(
+                "insert",
+                -1,
+                cppu::UnoType<ucb::InsertCommandArgument>::get() );
+    pCmdInfo[ 6 ] =
+            ucb::CommandInfo(
+                "open",
+                -1,
+                cppu::UnoType<ucb::OpenCommandArgument2>::get() );
+
+
+    // New commands
+
+
+    pCmdInfo[ 7 ] =
+            ucb::CommandInfo(
+                "post",
+                -1,
+                cppu::UnoType<ucb::PostCommandArgument2>::get() );
+    pCmdInfo[ 8 ] =
+            ucb::CommandInfo(
+                "addProperty",
+                -1,
+                cppu::UnoType<ucb::PropertyCommandArgument>::get() );
+    pCmdInfo[ 9 ] =
+            ucb::CommandInfo(
+                "removeProperty",
+                -1,
+                cppu::UnoType<OUString>::get() );
+
+    bool bFolder = false;
+
+    try
+    {
+        bFolder = isFolder( xEnv );
+    }
+    catch ( uno::Exception const & )
+    {
+        return aCmdInfo;
+    }
+
+    ResourceType eType = resourceTypeForLocks( xEnv );
+    bool bSupportsLocking = ( eType == NOT_FOUND || eType == DAV );
+
+    sal_Int32 nPos = aCmdInfo.getLength();
+    sal_Int32 nMoreCmds = ( bFolder ? 2 : 0 ) + ( bSupportsLocking ? 2 : 0 );
+    if ( nMoreCmds )
+        aCmdInfo.realloc( nPos + nMoreCmds );
+    else
+        return aCmdInfo;
+
+    pCmdInfo = aCmdInfo.getArray();
+
+    if ( bFolder )
+    {
+
+        // Optional standard commands
+
+
+        pCmdInfo[ nPos ] =
+            ucb::CommandInfo(
+                "transfer",
+                -1,
+                cppu::UnoType<ucb::TransferInfo>::get() );
+        nPos++;
+        pCmdInfo[ nPos ] =
+            ucb::CommandInfo(
+                "createNewContent",
+                -1,
+                cppu::UnoType<ucb::ContentInfo>::get() );
+        nPos++;
+    }
+    else
+    {
+        // no document-only commands at the moment.
+    }
+
+    if ( bSupportsLocking )
+    {
+        pCmdInfo[ nPos ] =
+            ucb::CommandInfo(
+                "lock",
+                -1,
+                cppu::UnoType<void>::get() );
+        nPos++;
+        pCmdInfo[ nPos ] =
+            ucb::CommandInfo(
+                "unlock",
+                -1,
+                cppu::UnoType<void>::get() );
+        nPos++;
+    }
+    return aCmdInfo;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/webdavdatasupplier.cxx b/ucb/source/ucp/webdav-curl/webdavdatasupplier.cxx
new file mode 100644
index 000000000..c5a008af8
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/webdavdatasupplier.cxx
@@ -0,0 +1,444 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+#include <sal/log.hxx>
+
+#include <utility>
+
+#include <rtl/ustrbuf.hxx>
+#include <com/sun/star/ucb/OpenMode.hpp>
+#include <ucbhelper/contentidentifier.hxx>
+#include <ucbhelper/providerhelper.hxx>
+#include "webdavdatasupplier.hxx"
+#include "webdavcontent.hxx"
+#include "DAVProperties.hxx"
+#include "CurlUri.hxx"
+#include <com/sun/star/ucb/IllegalIdentifierException.hpp>
+#include <com/sun/star/ucb/ResultSetException.hpp>
+#include <tools/diagnose_ex.h>
+
+using namespace com::sun::star;
+using namespace http_dav_ucp;
+
+namespace http_dav_ucp
+{
+
+namespace {
+
+auto DumpResources(std::vector<DAVResource> const& rResources) -> OUString
+{
+    OUStringBuffer buf;
+    for (auto const& rResource : rResources)
+    {
+        buf.append("resource URL: <");
+        buf.append(rResource.uri);
+        try {
+            CurlUri const uri(rResource.uri);
+            buf.append("> parsed URL: <");
+            buf.append(DecodeURI(uri.GetRelativeReference()));
+            buf.append("> ");
+        } catch (...) {
+            // parsing uri could fail
+            buf.append("> parsing URL failed! ");
+        }
+        buf.append("properties: ");
+        for (auto const& it : rResource.properties)
+        {
+            buf.append("\"");
+            buf.append(it.Name);
+            buf.append("\" ");
+        }
+        buf.append("\n");
+    }
+    buf.stripEnd('\n'); // the last newline is superfluous, remove it
+    return buf.makeStringAndClear();
+}
+
+}
+
+}
+
+
+// DataSupplier Implementation.
+
+
+DataSupplier::DataSupplier(
+            const uno::Reference< uno::XComponentContext >& rxContext,
+            const rtl::Reference< Content >& rContent,
+            sal_Int32 nOpenMode )
+    : m_xContent( rContent ), m_xContext( rxContext ), m_nOpenMode( nOpenMode ),
+      m_bCountFinal( false ), m_bThrowException( false )
+{
+}
+
+
+// virtual
+DataSupplier::~DataSupplier()
+{}
+
+
+// virtual
+OUString DataSupplier::queryContentIdentifierString( sal_uInt32 nIndex )
+{
+    osl::Guard< osl::Mutex > aGuard( m_aMutex );
+
+    if (nIndex < m_Results.size())
+    {
+        OUString aId = m_Results[ nIndex ]->aId;
+        if ( aId.getLength() )
+        {
+            // Already cached.
+            return aId;
+        }
+    }
+
+    if ( getResult( nIndex ) )
+    {
+        OUString aId = m_xContent->getResourceAccess().getURL();
+
+        const ContentProperties& props(*(m_Results[ nIndex ]->pData));
+
+        if ( ( aId.lastIndexOf( '/' ) + 1 ) != aId.getLength() )
+            aId += "/";
+
+        aId += props.getEscapedTitle();
+
+        if ( props.isTrailingSlash() )
+            aId += "/";
+
+        m_Results[ nIndex ]->aId = aId;
+        return aId;
+    }
+    return OUString();
+}
+
+
+// virtual
+uno::Reference< ucb::XContentIdentifier >
+DataSupplier::queryContentIdentifier( sal_uInt32 nIndex )
+{
+    osl::Guard< osl::Mutex > aGuard( m_aMutex );
+
+    if (nIndex < m_Results.size())
+    {
+        uno::Reference< ucb::XContentIdentifier > xId
+            = m_Results[ nIndex ]->xId;
+        if ( xId.is() )
+        {
+            // Already cached.
+            return xId;
+        }
+    }
+
+    OUString aId = queryContentIdentifierString( nIndex );
+    if ( aId.getLength() )
+    {
+        uno::Reference< ucb::XContentIdentifier > xId
+            = new ::ucbhelper::ContentIdentifier( aId );
+        m_Results[ nIndex ]->xId = xId;
+        return xId;
+    }
+    return uno::Reference< ucb::XContentIdentifier >();
+}
+
+
+// virtual
+uno::Reference< ucb::XContent >
+DataSupplier::queryContent( sal_uInt32 nIndex )
+{
+    osl::Guard< osl::Mutex > aGuard( m_aMutex );
+
+    if (nIndex < m_Results.size())
+    {
+        uno::Reference< ucb::XContent > xContent
+            = m_Results[ nIndex ]->xContent;
+        if ( xContent.is() )
+        {
+            // Already cached.
+            return xContent;
+        }
+    }
+
+    uno::Reference< ucb::XContentIdentifier > xId
+        = queryContentIdentifier( nIndex );
+    if ( xId.is() )
+    {
+        try
+        {
+            uno::Reference< ucb::XContent > xContent
+                = m_xContent->getProvider()->queryContent( xId );
+            m_Results[ nIndex ]->xContent = xContent;
+            return xContent;
+
+        }
+        catch ( ucb::IllegalIdentifierException& )
+        {
+        }
+    }
+    return uno::Reference< ucb::XContent >();
+}
+
+
+// virtual
+bool DataSupplier::getResult( sal_uInt32 nIndex )
+{
+    osl::ClearableGuard< osl::Mutex > aGuard( m_aMutex );
+
+    if (nIndex < m_Results.size())
+    {
+        // Result already present.
+        return true;
+    }
+
+    // Obtain values...
+    if ( getData() )
+    {
+        if (nIndex < m_Results.size())
+        {
+            // Result already present.
+            return true;
+        }
+    }
+
+    return false;
+}
+
+
+// virtual
+sal_uInt32 DataSupplier::totalCount()
+{
+  // Obtain values...
+  getData();
+
+  return m_Results.size();
+}
+
+
+// virtual
+sal_uInt32 DataSupplier::currentCount()
+{
+    return m_Results.size();
+}
+
+
+// virtual
+bool DataSupplier::isCountFinal()
+{
+    return m_bCountFinal;
+}
+
+
+// virtual
+uno::Reference< sdbc::XRow > DataSupplier::queryPropertyValues(
+                                                    sal_uInt32 nIndex  )
+{
+    osl::Guard< osl::Mutex > aGuard( m_aMutex );
+
+    if (nIndex < m_Results.size())
+    {
+        uno::Reference< sdbc::XRow > xRow = m_Results[ nIndex ]->xRow;
+        if ( xRow.is() )
+        {
+            // Already cached.
+            return xRow;
+        }
+    }
+
+    if ( getResult( nIndex ) )
+    {
+        uno::Reference< sdbc::XRow > xRow
+            = Content::getPropertyValues(
+                m_xContext,
+                getResultSet()->getProperties(),
+                *(m_Results[ nIndex ]->pData),
+                m_xContent->getProvider(),
+                queryContentIdentifierString( nIndex ) );
+        m_Results[ nIndex ]->xRow = xRow;
+        return xRow;
+    }
+
+    return uno::Reference< sdbc::XRow >();
+}
+
+
+// virtual
+void DataSupplier::releasePropertyValues( sal_uInt32 nIndex )
+{
+    osl::Guard< osl::Mutex > aGuard( m_aMutex );
+
+    if (nIndex < m_Results.size())
+        m_Results[ nIndex ]->xRow.clear();
+}
+
+
+// virtual
+void DataSupplier::close()
+{
+}
+
+
+// virtual
+void DataSupplier::validate()
+{
+    if ( m_bThrowException )
+        throw ucb::ResultSetException();
+}
+
+bool DataSupplier::getData()
+{
+    osl::ClearableGuard< osl::Mutex > aGuard( m_aMutex );
+
+    if ( !m_bCountFinal )
+    {
+        std::vector< OUString > propertyNames;
+        ContentProperties::UCBNamesToDAVNames(
+                        getResultSet()->getProperties(), propertyNames );
+
+        // Append "resourcetype", if not already present. It's value is
+        // needed to get a valid ContentProperties::pIsFolder value, which
+        // is needed for OpenMode handling.
+
+        bool isNoResourceType = std::none_of(propertyNames.begin(), propertyNames.end(),
+            [](const OUString& rPropName) { return rPropName.equals(DAVProperties::RESOURCETYPE); });
+
+        if ( isNoResourceType )
+            propertyNames.push_back( DAVProperties::RESOURCETYPE );
+
+        std::vector< DAVResource > resources;
+        try
+        {
+            // propfind depth 1, get property values for parent AND for each
+            // child
+            m_xContent->getResourceAccess()
+                .PROPFIND( DAVONE,
+                           propertyNames,
+                           resources,
+                           getResultSet()->getEnvironment() );
+            SAL_INFO("ucb.ucp.webdav", "getData() - " << DumpResources(resources));
+        }
+        catch ( DAVException & )
+        {
+            TOOLS_WARN_EXCEPTION( "ucb.ucp.webdav", "PROPFIND : DAVException" );
+            m_bThrowException = true;
+        }
+
+        if ( !m_bThrowException )
+        {
+            try
+            {
+                CurlUri const aURI(
+                    m_xContent->getResourceAccess().getURL() );
+                OUString aPath = aURI.GetPath();
+
+                if ( aPath.endsWith("/") )
+                    aPath = aPath.copy( 0, aPath.getLength() - 1 );
+
+                aPath = DecodeURI(aPath);
+                bool bFoundParent = false;
+
+                for ( size_t n = 0; n < resources.size(); ++n )
+                {
+                    const DAVResource & rRes = resources[ n ];
+
+                    // Filter parent, which is contained somewhere(!) in
+                    // the vector.
+                    if ( !bFoundParent )
+                    {
+                        try
+                        {
+                            CurlUri const aCurrURI( rRes.uri );
+                            OUString aCurrPath = aCurrURI.GetPath();
+                            if ( aCurrPath.endsWith("/") )
+                                aCurrPath
+                                    = aCurrPath.copy(
+                                        0,
+                                        aCurrPath.getLength() - 1 );
+
+                            aCurrPath = DecodeURI(aCurrPath);
+                            if ( aPath == aCurrPath )
+                            {
+                                bFoundParent = true;
+                                continue;
+                            }
+                        }
+                        catch ( DAVException const & )
+                        {
+                            // do nothing, ignore error. continue.
+                        }
+                    }
+
+                    std::unique_ptr<ContentProperties> pContentProperties
+                        = std::make_unique<ContentProperties>( rRes );
+
+                    // Check resource against open mode.
+                    switch ( m_nOpenMode )
+                    {
+                    case ucb::OpenMode::FOLDERS:
+                        {
+                            bool bFolder = false;
+
+                            const uno::Any & rValue
+                                = pContentProperties->getValue( "IsFolder" );
+                            rValue >>= bFolder;
+
+                            if ( !bFolder )
+                                continue;
+
+                            break;
+                        }
+
+                    case ucb::OpenMode::DOCUMENTS:
+                        {
+                            bool bDocument = false;
+
+                            const uno::Any & rValue
+                                = pContentProperties->getValue( "IsDocument" );
+                            rValue >>= bDocument;
+
+                            if ( !bDocument )
+                                continue;
+
+                            break;
+                        }
+
+                    case ucb::OpenMode::ALL:
+                    default:
+                        break;
+                    }
+
+                    m_Results.push_back(
+                        std::make_unique<ResultListEntry>(std::move(pContentProperties)));
+                }
+            }
+            catch ( DAVException const & )
+            {
+            }
+        }
+
+        m_bCountFinal = true;
+
+        // Callback possible, because listeners may be informed!
+        aGuard.clear();
+        getResultSet()->rowCountFinal();
+    }
+    return !m_bThrowException;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/webdavdatasupplier.hxx b/ucb/source/ucp/webdav-curl/webdavdatasupplier.hxx
new file mode 100644
index 000000000..e1f2efba9
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/webdavdatasupplier.hxx
@@ -0,0 +1,92 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#pragma once
+
+#include <sal/config.h>
+
+#include "ContentProperties.hxx"
+#include <memory>
+#include <rtl/ref.hxx>
+#include <ucbhelper/resultset.hxx>
+
+namespace http_dav_ucp {
+
+struct DataSupplier_Impl;
+class Content;
+struct DAVResource;
+
+class DataSupplier : public ucbhelper::ResultSetDataSupplier
+{
+    bool getData();
+
+public:
+    DataSupplier( const css::uno::Reference< css::uno::XComponentContext >& rxContext,
+              const rtl::Reference< Content >& rContent,
+              sal_Int32 nOpenMode);
+
+    virtual ~DataSupplier() override;
+
+    virtual OUString queryContentIdentifierString( sal_uInt32 nIndex ) override;
+    virtual css::uno::Reference< css::ucb::XContentIdentifier >
+    queryContentIdentifier( sal_uInt32 nIndex ) override;
+    virtual css::uno::Reference< css::ucb::XContent >
+    queryContent( sal_uInt32 nIndex ) override;
+
+    virtual bool getResult( sal_uInt32 nIndex ) override;
+
+    virtual sal_uInt32 totalCount() override;
+    virtual sal_uInt32 currentCount() override;
+    virtual bool isCountFinal() override;
+
+    virtual css::uno::Reference< css::sdbc::XRow >
+    queryPropertyValues( sal_uInt32 nIndex  ) override;
+    virtual void releasePropertyValues( sal_uInt32 nIndex ) override;
+
+    virtual void close() override;
+
+    virtual void validate() override;
+
+private:
+    struct ResultListEntry
+    {
+        OUString                             aId;
+        css::uno::Reference< css::ucb::XContentIdentifier > xId;
+        css::uno::Reference< css::ucb::XContent >           xContent;
+        css::uno::Reference< css::sdbc::XRow >              xRow;
+        std::unique_ptr<ContentProperties> pData;
+
+        explicit ResultListEntry( std::unique_ptr<ContentProperties> && pEntry ) : pData( std::move(pEntry) ) {}
+    };
+
+    typedef std::vector<std::unique_ptr<ResultListEntry>> ResultList;
+
+    osl::Mutex                                   m_aMutex;
+    ResultList                                   m_Results;
+    rtl::Reference< Content >                    m_xContent;
+    css::uno::Reference< css::uno::XComponentContext > m_xContext;
+    sal_Int32                                    m_nOpenMode;
+    bool                                         m_bCountFinal;
+    bool                                         m_bThrowException;
+};
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/webdavprovider.cxx b/ucb/source/ucp/webdav-curl/webdavprovider.cxx
new file mode 100644
index 000000000..effd6665a
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/webdavprovider.cxx
@@ -0,0 +1,174 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <comphelper/processfactory.hxx>
+#include <ucbhelper/contentidentifier.hxx>
+#include <ucbhelper/macros.hxx>
+#include "webdavprovider.hxx"
+#include "webdavcontent.hxx"
+
+#include <cppuhelper/queryinterface.hxx>
+#include <osl/mutex.hxx>
+#include <com/sun/star/ucb/IllegalIdentifierException.hpp>
+
+#include <tools/urlobj.hxx>
+
+using namespace com::sun::star;
+using namespace http_dav_ucp;
+
+
+// ContentProvider Implementation.
+
+
+ContentProvider::ContentProvider(
+                const uno::Reference< uno::XComponentContext >& rContext )
+: ::ucbhelper::ContentProviderImplHelper( rContext ),
+  m_xDAVSessionFactory( new DAVSessionFactory )
+{
+}
+
+
+// virtual
+ContentProvider::~ContentProvider()
+{}
+
+
+// XInterface methods.
+void SAL_CALL ContentProvider::acquire() noexcept
+{
+    OWeakObject::acquire();
+}
+
+void SAL_CALL ContentProvider::release() noexcept
+{
+    OWeakObject::release();
+}
+
+css::uno::Any SAL_CALL ContentProvider::queryInterface( const css::uno::Type & rType )
+{
+    css::uno::Any aRet = cppu::queryInterface( rType,
+    static_cast< lang::XTypeProvider* >(this),
+    static_cast< lang::XServiceInfo* >(this),
+    static_cast< ucb::XContentProvider* >(this)
+                    );
+    return aRet.hasValue() ? aRet : OWeakObject::queryInterface( rType );
+}
+
+// XTypeProvider methods.
+
+
+XTYPEPROVIDER_IMPL_3( ContentProvider,
+                      lang::XTypeProvider,
+                      lang::XServiceInfo,
+                      ucb::XContentProvider );
+
+
+// XServiceInfo methods.
+
+OUString
+ContentProvider::getImplementationName()
+{
+    return "com.sun.star.comp.WebDAVContentProvider";
+}
+
+css::uno::Sequence< OUString >
+ContentProvider::getSupportedServiceNames()
+{
+    return { WEBDAV_CONTENT_PROVIDER_SERVICE_NAME };
+}
+
+sal_Bool
+ContentProvider::supportsService(const OUString& s)
+{
+    return cppu::supportsService(this, s);
+}
+
+// XContentProvider methods.
+
+
+// virtual
+uno::Reference< ucb::XContent > SAL_CALL
+ContentProvider::queryContent(
+            const uno::Reference<
+                    ucb::XContentIdentifier >& Identifier )
+{
+    // Check URL scheme...
+    INetURLObject aURL(Identifier->getContentIdentifier());
+
+    if (aURL.isSchemeEqualTo(INetProtocol::NotValid))
+        throw ucb::IllegalIdentifierException();
+
+    if (!aURL.isAnyKnownWebDAVScheme())
+        throw ucb::IllegalIdentifierException();
+
+    uno::Reference< ucb::XContentIdentifier > xCanonicId;
+
+    if (aURL.isSchemeEqualTo(INetProtocol::VndSunStarWebdav) ||
+        aURL.isSchemeEqualTo(DAV_URL_SCHEME) ||
+        aURL.isSchemeEqualTo(WEBDAV_URL_SCHEME))
+    {
+        aURL.changeScheme(INetProtocol::Http);
+        xCanonicId = new ::ucbhelper::ContentIdentifier( aURL.getExternalURL() );
+    }
+    else if (aURL.isSchemeEqualTo(VNDSUNSTARWEBDAVS_URL_SCHEME) ||
+        aURL.isSchemeEqualTo(DAVS_URL_SCHEME) ||
+        aURL.isSchemeEqualTo(WEBDAVS_URL_SCHEME))
+    {
+        aURL.changeScheme(INetProtocol::Https);
+        xCanonicId = new ::ucbhelper::ContentIdentifier( aURL.getExternalURL() );
+    }
+    else
+    {
+        xCanonicId = Identifier;
+    }
+
+    osl::MutexGuard aGuard( m_aMutex );
+
+    // Check, if a content with given id already exists...
+    uno::Reference<ucb::XContent> xContent = queryExistingContent(xCanonicId);
+    if ( xContent.is() )
+        return xContent;
+
+    // Create a new content.
+
+    try
+    {
+        xContent = new ::http_dav_ucp::Content(
+                        m_xContext, this, xCanonicId, m_xDAVSessionFactory );
+        registerNewContent( xContent );
+    }
+    catch ( ucb::ContentCreationException const & )
+    {
+        throw ucb::IllegalIdentifierException();
+    }
+
+    if ( !xContent->getIdentifier().is() )
+        throw ucb::IllegalIdentifierException();
+
+    return xContent;
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
+ucb_webdav_ContentProvider_get_implementation(
+    css::uno::XComponentContext* context, css::uno::Sequence<css::uno::Any> const&)
+{
+    return cppu::acquire(new ContentProvider(context));
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/webdavprovider.hxx b/ucb/source/ucp/webdav-curl/webdavprovider.hxx
new file mode 100644
index 000000000..a05377cfe
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/webdavprovider.hxx
@@ -0,0 +1,100 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#pragma once
+
+#include <sal/config.h>
+
+#include <memory>
+
+#include <rtl/ref.hxx>
+#include <com/sun/star/beans/Property.hpp>
+#include "DAVSessionFactory.hxx"
+#include <ucbhelper/providerhelper.hxx>
+#include "PropertyMap.hxx"
+
+namespace com::sun::star::lang {
+class XSingleServiceFactory;
+}
+
+namespace http_dav_ucp {
+
+
+// UNO service name for the provider. This name will be used by the UCB to
+// create instances of the provider.
+inline constexpr OUStringLiteral WEBDAV_CONTENT_PROVIDER_SERVICE_NAME = u"com.sun.star.ucb.WebDAVContentProvider";
+
+// URL scheme. This is the scheme the provider will be able to create
+// contents for. The UCB will select the provider ( i.e. in order to create
+// contents ) according to this scheme.
+#define VNDSUNSTARWEBDAV_URL_SCHEME  "vnd.sun.star.webdav"
+#define VNDSUNSTARWEBDAVS_URL_SCHEME u"vnd.sun.star.webdavs"
+#define HTTP_URL_SCHEME              u"http"
+#define HTTPS_URL_SCHEME             u"https"
+#define DAV_URL_SCHEME               u"dav"
+#define DAVS_URL_SCHEME              u"davs"
+#define WEBDAV_URL_SCHEME            u"webdav"
+#define WEBDAVS_URL_SCHEME           u"webdavs"
+
+inline constexpr OUStringLiteral HTTP_CONTENT_TYPE = u"application/" HTTP_URL_SCHEME "-content";
+
+#define WEBDAV_CONTENT_TYPE    HTTP_CONTENT_TYPE
+inline constexpr OUStringLiteral WEBDAV_COLLECTION_TYPE = u"application/" VNDSUNSTARWEBDAV_URL_SCHEME "-collection";
+
+
+class ContentProvider : public ::ucbhelper::ContentProviderImplHelper
+{
+    rtl::Reference< DAVSessionFactory > m_xDAVSessionFactory;
+    std::unique_ptr<PropertyMap> m_pProps;
+
+public:
+    explicit ContentProvider( const css::uno::Reference< css::uno::XComponentContext >& rContext );
+    virtual ~ContentProvider() override;
+
+    // XInterface
+    virtual css::uno::Any SAL_CALL queryInterface( const css::uno::Type & rType ) override;
+    virtual void SAL_CALL acquire()
+        noexcept override;
+    virtual void SAL_CALL release()
+        noexcept override;
+
+    // XTypeProvider
+    virtual css::uno::Sequence< sal_Int8 > SAL_CALL getImplementationId() override;
+    virtual css::uno::Sequence< css::uno::Type > SAL_CALL getTypes() override;
+
+    // XServiceInfo
+    virtual OUString SAL_CALL getImplementationName() override;
+    virtual sal_Bool SAL_CALL supportsService( const OUString& ServiceName ) override;
+    virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override;
+
+    // XContentProvider
+    virtual css::uno::Reference< css::ucb::XContent > SAL_CALL
+    queryContent( const css::uno::Reference< css::ucb::XContentIdentifier >& Identifier ) override;
+
+
+    // Non-interface methods.
+
+    bool getProperty( const OUString & rPropName,
+                      css::beans::Property & rProp );
+};
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/webdavresponseparser.cxx b/ucb/source/ucp/webdav-curl/webdavresponseparser.cxx
new file mode 100644
index 000000000..9a0500d01
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/webdavresponseparser.cxx
@@ -0,0 +1,1001 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include "webdavresponseparser.hxx"
+
+#include "DAVProperties.hxx"
+#include "UCBDeadPropertyValue.hxx"
+
+#include <comphelper/processfactory.hxx>
+#include <comphelper/sequence.hxx>
+
+#include <cppuhelper/implbase.hxx>
+#include <com/sun/star/xml/sax/Parser.hpp>
+#include <com/sun/star/xml/sax/InputSource.hpp>
+#include <com/sun/star/xml/sax/XDocumentHandler.hpp>
+#include <com/sun/star/ucb/LockEntry.hpp>
+#include <com/sun/star/ucb/LockScope.hpp>
+#include <com/sun/star/ucb/LockType.hpp>
+#include <com/sun/star/ucb/Lock.hpp>
+#include <map>
+#include <unordered_map>
+#include <rtl/ref.hxx>
+#include <rtl/uri.hxx>
+#include <sal/log.hxx>
+#include <o3tl/string_view.hxx>
+
+using namespace com::sun::star;
+using namespace http_dav_ucp;
+
+
+// WebDAVNamespace enum and StringToEnum converter
+namespace
+{
+    enum WebDAVNamespace
+    {
+        WebDAVNamespace_unknown = 0,
+        WebDAVNamespace_DAV,
+        WebDAVNamespace_ucb_openoffice_org_dav_props,
+
+        WebDAVNamespace_last
+    };
+
+    WebDAVNamespace StrToWebDAVNamespace(::std::u16string_view rStr)
+    {
+        if (rStr == u"DAV:")
+        {
+            return WebDAVNamespace_DAV;
+        }
+        else if (rStr == u"http://ucb.openoffice.org/dav/props/")
+        {
+            return WebDAVNamespace_ucb_openoffice_org_dav_props;
+        }
+
+        return WebDAVNamespace_unknown;
+    }
+} // end of anonymous namespace
+
+// WebDAVName enum and StringToEnum converter using unordered_map
+namespace
+{
+    enum WebDAVName
+    {
+        WebDAVName_unknown = 0,
+        WebDAVName_activelock,
+        WebDAVName_lockdiscovery,
+        WebDAVName_multistatus,
+        WebDAVName_response,
+        WebDAVName_href,
+        WebDAVName_propstat,
+        WebDAVName_prop,
+        WebDAVName_resourcetype,
+        WebDAVName_collection,
+        WebDAVName_getcontenttype,
+        WebDAVName_supportedlock,
+        WebDAVName_lockentry,
+        WebDAVName_lockscope,
+        WebDAVName_depth,
+        WebDAVName_locktoken,
+        WebDAVName_exclusive,
+        WebDAVName_locktype,
+        WebDAVName_owner,
+        WebDAVName_timeout,
+        WebDAVName_write,
+        WebDAVName_shared,
+        WebDAVName_status,
+        WebDAVName_getlastmodified,
+        WebDAVName_creationdate,
+        WebDAVName_getcontentlength,
+        WebDAVName_type,
+        WebDAVName_value,
+        WebDAVName_ucbprop,
+
+        WebDAVName_last
+    };
+
+    WebDAVName StrToWebDAVName(const OUString& rStr)
+    {
+        typedef std::unordered_map< OUString, WebDAVName > WebDAVNameMapper;
+        typedef std::pair< OUString, WebDAVName > WebDAVNameValueType;
+        static WebDAVNameMapper aWebDAVNameMapperList;
+
+        if(aWebDAVNameMapperList.empty())
+        {
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("activelock"), WebDAVName_activelock));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("lockdiscovery"), WebDAVName_lockdiscovery));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("multistatus"), WebDAVName_multistatus));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("response"), WebDAVName_response));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("href"), WebDAVName_href));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("propstat"), WebDAVName_propstat));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("prop"), WebDAVName_prop));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("resourcetype"), WebDAVName_resourcetype));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("collection"), WebDAVName_collection));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("getcontenttype"), WebDAVName_getcontenttype));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("supportedlock"), WebDAVName_supportedlock));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("lockentry"), WebDAVName_lockentry));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("lockscope"), WebDAVName_lockscope));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("depth"), WebDAVName_depth));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("locktoken"), WebDAVName_locktoken));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("exclusive"), WebDAVName_exclusive));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("locktype"), WebDAVName_locktype));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("owner"), WebDAVName_owner));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("timeout"), WebDAVName_timeout));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("write"), WebDAVName_write));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("shared"), WebDAVName_shared));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("status"), WebDAVName_status));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("getlastmodified"), WebDAVName_getlastmodified));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("creationdate"), WebDAVName_creationdate));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("getcontentlength"), WebDAVName_getcontentlength));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("type"), WebDAVName_type));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("value"), WebDAVName_value));
+            aWebDAVNameMapperList.insert(WebDAVNameValueType(OUString("ucbprop"), WebDAVName_ucbprop));
+        }
+
+        const WebDAVNameMapper::const_iterator aResult(aWebDAVNameMapperList.find(rStr));
+
+        if(aResult == aWebDAVNameMapperList.end())
+        {
+            return WebDAVName_unknown;
+        }
+        else
+        {
+            return aResult->second;
+        }
+    }
+} // end of anonymous namespace
+
+
+// WebDAVContext, holding information for each start/endElement pair
+
+namespace
+{
+    typedef std::map< OUString, OUString > NamespaceMap;
+
+    class WebDAVContext
+    {
+    private:
+        WebDAVContext*              mpParent;
+        NamespaceMap                maNamespaceMap;
+        OUString             maWhiteSpace;
+
+        OUString             maNamespace;
+        OUString             maName;
+
+        WebDAVNamespace             maWebDAVNamespace;
+        WebDAVName                  maWebDAVName;
+
+        // local helpers
+        void parseForNamespaceTokens(const uno::Reference< xml::sax::XAttributeList >& xAttribs);
+        OUString mapNamespaceToken(const OUString& rToken) const;
+        void splitName(const OUString& rSource);
+
+    public:
+        WebDAVContext(WebDAVContext* pParent, const OUString& aName, const uno::Reference< xml::sax::XAttributeList >& xAttribs);
+
+        WebDAVContext* getParent() const { return mpParent; }
+        OUString& getWhiteSpace() { return maWhiteSpace; }
+        void setWhiteSpace(const OUString& rNew) { maWhiteSpace = rNew; }
+
+        const OUString& getNamespace() const { return maNamespace; }
+        const OUString& getName() const { return maName; }
+        const WebDAVNamespace& getWebDAVNamespace() const { return maWebDAVNamespace; }
+        const WebDAVName& getWebDAVName() const { return maWebDAVName; }
+    };
+
+    void WebDAVContext::parseForNamespaceTokens(const uno::Reference< xml::sax::XAttributeList >& xAttribs)
+    {
+        const sal_Int16 nAttributes(xAttribs->getLength());
+
+        for(sal_Int16 a(0); a < nAttributes; a++)
+        {
+            const OUString aName(xAttribs->getNameByIndex(a));
+            const sal_Int32 nLen(aName.getLength());
+
+            if(nLen)
+            {
+                if(aName.startsWith("xmlns"))
+                {
+                    const sal_Int32 nIndex(aName.indexOf(':', 0));
+
+                    if(-1 != nIndex && nIndex + 1 < nLen)
+                    {
+                        const OUString aToken(aName.copy(nIndex + 1));
+
+                        maNamespaceMap.emplace(aToken, xAttribs->getValueByIndex(a));
+                    }
+                }
+            }
+        }
+    }
+
+    OUString WebDAVContext::mapNamespaceToken(const OUString& rToken) const
+    {
+        NamespaceMap::const_iterator iter = maNamespaceMap.find(rToken);
+
+        if(maNamespaceMap.end() == iter)
+        {
+            if(getParent())
+            {
+                return getParent()->mapNamespaceToken(rToken);
+            }
+            else
+            {
+                return rToken;
+            }
+        }
+        else
+        {
+            return (*iter).second;
+        }
+    }
+
+    void WebDAVContext::splitName(const OUString& rSource)
+    {
+        const sal_Int32 nLen(rSource.getLength());
+        maNamespace.clear();
+        maName = rSource;
+
+        if(nLen)
+        {
+            const sal_Int32 nIndex(rSource.indexOf(':', 0));
+
+            if(nIndex > 0 && ((nIndex + 1) < nLen))
+            {
+                maNamespace = mapNamespaceToken(rSource.copy(0, nIndex));
+                maName = rSource.copy(nIndex + 1);
+            }
+        }
+    }
+
+    WebDAVContext::WebDAVContext(WebDAVContext* pParent, const OUString& aName, const uno::Reference< xml::sax::XAttributeList >& xAttribs)
+    :   mpParent(pParent),
+        maNamespaceMap(),
+        maWhiteSpace(),
+        maNamespace(),
+        maName(),
+        maWebDAVNamespace(WebDAVNamespace_unknown),
+        maWebDAVName(WebDAVName_unknown)
+    {
+        const sal_Int16 nAttributes(xAttribs->getLength());
+
+        if(nAttributes)
+        {
+            // parse evtl. namespace entries
+            parseForNamespaceTokens(xAttribs);
+        }
+
+        // split name to namespace and name
+        splitName(aName);
+
+        // evaluate enums for namespace and name
+        maWebDAVNamespace = StrToWebDAVNamespace(maNamespace);
+        maWebDAVName = StrToWebDAVName(maName);
+    }
+} // end of anonymous namespace
+
+
+// the Xml parser itself
+
+namespace
+{
+    enum WebDAVResponseParserMode
+    {
+        WebDAVResponseParserMode_PropFind = 0,
+        WebDAVResponseParserMode_PropName,
+        WebDAVResponseParserMode_Lock
+    };
+
+    class WebDAVResponseParser : public cppu::WeakImplHelper< css::xml::sax::XDocumentHandler >
+    {
+    private:
+        std::vector< ucb::Lock >                      maResult_Lock;
+        std::vector< http_dav_ucp::DAVResource >      maResult_PropFind;
+        std::vector< http_dav_ucp::DAVResourceInfo >  maResult_PropName;
+
+        WebDAVContext*                              mpContext;
+        OUString                             maHref;
+        OUString                             maStatus;
+        OUString m_UCBType;
+        OUString m_UCBValue;
+        std::vector< http_dav_ucp::DAVPropertyValue > maResponseProperties;
+        std::vector< http_dav_ucp::DAVPropertyValue > maPropStatProperties;
+        std::vector< OUString >              maResponseNames;
+        std::vector< OUString >              maPropStatNames;
+        uno::Sequence< ucb::LockEntry >             maLockEntries;
+        ucb::LockScope                              maLockScope;
+        ucb::LockType                               maLockType;
+        ucb::Lock                                   maLock;
+        WebDAVResponseParserMode                    meWebDAVResponseParserMode;
+
+        bool                                        mbResourceTypeCollection : 1;
+        bool                                        mbLockScopeSet : 1;
+        bool                                        mbLockTypeSet : 1;
+
+        // local helpers
+        bool whitespaceIsAvailable() const
+        {
+            return mpContext && mpContext->getWhiteSpace().getLength();
+        }
+        bool hasParent(WebDAVName aWebDAVName) const
+        {
+            return mpContext && mpContext->getParent() && aWebDAVName == mpContext->getParent()->getWebDAVName();
+        }
+        bool propertyIsReady() const
+        {
+            return hasParent(WebDAVName_prop) && whitespaceIsAvailable();
+        }
+        bool isCollectingProperties() const
+        {
+            return WebDAVResponseParserMode_PropFind == meWebDAVResponseParserMode;
+        }
+        bool isCollectingPropNames() const
+        {
+            return WebDAVResponseParserMode_PropName == meWebDAVResponseParserMode;
+        }
+        bool collectThisPropertyAsName() const
+        {
+            return isCollectingPropNames() && hasParent(WebDAVName_prop);
+        }
+        void pop_context()
+        {
+            if(mpContext)
+            {
+                WebDAVContext* pTemp = mpContext;
+                mpContext = mpContext->getParent();
+                delete pTemp;
+            }
+            else
+            {
+                SAL_WARN( "ucb.ucp.webdav", "Parser context pop without context (!)");
+            }
+        }
+
+    public:
+        explicit WebDAVResponseParser(WebDAVResponseParserMode eWebDAVResponseParserMode);
+        virtual ~WebDAVResponseParser() override;
+
+        // Methods XDocumentHandler
+        virtual void SAL_CALL startDocument(  ) override;
+        virtual void SAL_CALL endDocument(  ) override;
+        virtual void SAL_CALL startElement( const OUString& aName, const uno::Reference< xml::sax::XAttributeList >& xAttribs ) override;
+        virtual void SAL_CALL endElement( const OUString& aName ) override;
+        virtual void SAL_CALL characters( const OUString& aChars ) override;
+        virtual void SAL_CALL ignorableWhitespace( const OUString& aWhitespaces ) override;
+        virtual void SAL_CALL processingInstruction( const OUString& aTarget, const OUString& aData ) override;
+        virtual void SAL_CALL setDocumentLocator( const uno::Reference< xml::sax::XLocator >& xLocator ) override;
+
+        const std::vector< ucb::Lock >& getResult_Lock() const { return maResult_Lock; }
+        const std::vector< http_dav_ucp::DAVResource >& getResult_PropFind() const { return maResult_PropFind; }
+        const std::vector< http_dav_ucp::DAVResourceInfo >& getResult_PropName() const { return maResult_PropName; }
+    };
+
+    WebDAVResponseParser::WebDAVResponseParser(WebDAVResponseParserMode eWebDAVResponseParserMode)
+    :   maResult_PropFind(),
+        maResult_PropName(),
+        mpContext(nullptr),
+        maHref(),
+        maStatus(),
+        maResponseProperties(),
+        maPropStatProperties(),
+        maResponseNames(),
+        maPropStatNames(),
+        maLockEntries(),
+        maLockScope(ucb::LockScope_EXCLUSIVE),
+        maLockType(ucb::LockType_WRITE),
+        meWebDAVResponseParserMode(eWebDAVResponseParserMode),
+        mbResourceTypeCollection(false),
+        mbLockScopeSet(false),
+        mbLockTypeSet(false)
+    {
+    }
+
+    WebDAVResponseParser::~WebDAVResponseParser()
+    {
+        SAL_WARN_IF(mpContext, "ucb.ucp.webdav", "Parser destructed with existing content (!)");
+        while(mpContext)
+        {
+            pop_context();
+        }
+    }
+
+    void SAL_CALL WebDAVResponseParser::startDocument(  )
+    {
+        SAL_WARN_IF(mpContext, "ucb.ucp.webdav", "Parser start with existing content (!)");
+    }
+
+    void SAL_CALL WebDAVResponseParser::endDocument(  )
+    {
+        SAL_WARN_IF(mpContext, "ucb.ucp.webdav", "Parser end with existing content (!)");
+    }
+
+    void SAL_CALL WebDAVResponseParser::startElement( const OUString& aName, const uno::Reference< xml::sax::XAttributeList >& xAttribs )
+    {
+        const sal_Int32 nLen(aName.getLength());
+
+        if(nLen)
+        {
+            // create new context (push)
+            mpContext = new WebDAVContext(mpContext, aName, xAttribs);
+
+            if(collectThisPropertyAsName())
+            {
+                // When collecting property names and parent is prop there is no need
+                // to handle the content of this property deeper (evtl. preparations)
+            }
+            else
+            {
+                switch(mpContext->getWebDAVNamespace())
+                {
+                    default: // WebDAVNamespace_unknown, WebDAVNamespace_last or unhandled
+                    {
+                        break;
+                    }
+                    case WebDAVNamespace_DAV:
+                    {
+                        switch(mpContext->getWebDAVName())
+                        {
+                            default: // WebDAVName_unknown, WebDAVName_last or unhandled
+                            {
+                                break;
+                            }
+                            case WebDAVName_propstat:
+                            {
+                                // propstat start
+                                if(isCollectingProperties())
+                                {
+                                    // reset maPropStatProperties
+                                    maPropStatProperties.clear();
+                                }
+                                else
+                                {
+                                    // when collecting properties reset maPropStatNames
+                                    maPropStatNames.clear();
+                                }
+                                break;
+                            }
+                            case WebDAVName_response:
+                            {
+                                // response start, reset Href and status and maResponseProperties
+                                maHref.clear();
+                                maStatus.clear();
+
+                                if(isCollectingProperties())
+                                {
+                                    // reset maResponseProperties
+                                    maResponseProperties.clear();
+                                }
+                                else
+                                {
+                                    // reset maResponseNames when collecting properties
+                                    maResponseNames.clear();
+                                }
+                                break;
+                            }
+                            case WebDAVName_resourcetype:
+                            {
+                                // resourcetype start, reset collection
+                                mbResourceTypeCollection = false;
+                                break;
+                            }
+                            case WebDAVName_supportedlock:
+                            {
+                                // supportedlock start, reset maLockEntries
+                                maLockEntries.realloc(0);
+                                break;
+                            }
+                            case WebDAVName_lockentry:
+                            {
+                                // lockentry start, reset maLockEntries
+                                mbLockScopeSet = false;
+                                mbLockTypeSet = false;
+                                break;
+                            }
+                            case WebDAVName_activelock:
+                            {
+                                maLock = ucb::Lock();
+                                break;
+                            }
+                        }
+                        break;
+                    }
+                    case WebDAVNamespace_ucb_openoffice_org_dav_props:
+                    {
+                        break;
+                    }
+                }
+            }
+        }
+    }
+
+    OUString MakePropertyName(WebDAVContext const& rContext)
+    {
+        OUString ret;
+        OString const name(OUStringToOString(rContext.getName(), RTL_TEXTENCODING_UTF8));
+        OString const nameSpace(OUStringToOString(rContext.getNamespace(), RTL_TEXTENCODING_UTF8));
+        DAVProperties::createUCBPropName(nameSpace.getStr(), name.getStr(), ret);
+        return ret;
+    }
+
+    void SAL_CALL WebDAVResponseParser::endElement( const OUString& aName )
+    {
+        const sal_Int32 nLen(aName.getLength());
+        SAL_WARN_IF(!mpContext, "ucb.ucp.webdav", "Parser EndElement without content (!)");
+
+        if(mpContext && nLen)
+        {
+            if(collectThisPropertyAsName())
+            {
+                // name must be encoded as expected by createSerfPropName()
+                OUString const name(MakePropertyName(*mpContext));
+                maPropStatNames.emplace_back(name);
+            }
+            else
+            {
+                switch(mpContext->getWebDAVNamespace())
+                {
+                    default: // WebDAVNamespace_unknown, WebDAVNamespace_last or unhandled
+                    {
+                        break;
+                    }
+                    case WebDAVNamespace_DAV:
+                    {
+                        switch(mpContext->getWebDAVName())
+                        {
+                            default: // WebDAVName_unknown, WebDAVName_last or unhandled
+                            {
+                                break;
+                            }
+                            case WebDAVName_href:
+                            {
+                                // href end, save it if we have whitespace
+                                if(whitespaceIsAvailable())
+                                {
+                                    // Sharepoint 2016 workaround: apparently
+                                    // the result is an IRI (RFC 3987 possibly?)
+                                    // so try to encode the non-ASCII chars
+                                    // without changing anything else
+                                    maHref = ::rtl::Uri::encode(mpContext->getWhiteSpace(),
+                                            rtl_UriCharClassUric, rtl_UriEncodeKeepEscapes,
+                                            RTL_TEXTENCODING_UTF8);
+                                }
+                                break;
+                            }
+                            case WebDAVName_status:
+                            {
+                                // status end, save it if we have whitespace
+                                if(whitespaceIsAvailable())
+                                {
+                                    maStatus = mpContext->getWhiteSpace();
+                                }
+                                break;
+                            }
+                            case WebDAVName_getlastmodified:
+                            {
+                                // getlastmodified end, safe if content is correct
+                                if(propertyIsReady())
+                                {
+                                    http_dav_ucp::DAVPropertyValue aDAVPropertyValue;
+
+                                    aDAVPropertyValue.Name = "DAV:getlastmodified";
+                                    aDAVPropertyValue.Value <<= mpContext->getWhiteSpace();
+                                    maPropStatProperties.push_back(aDAVPropertyValue);
+                                }
+                                break;
+                            }
+                            case WebDAVName_creationdate:
+                            {
+                                // creationdate end, safe if content is correct
+                                if(propertyIsReady())
+                                {
+                                    http_dav_ucp::DAVPropertyValue aDAVPropertyValue;
+
+                                    aDAVPropertyValue.Name = "DAV:creationdate";
+                                    aDAVPropertyValue.Value <<= mpContext->getWhiteSpace();
+                                    maPropStatProperties.push_back(aDAVPropertyValue);
+                                }
+                                break;
+                            }
+                            case WebDAVName_collection:
+                            {
+                                // collection end, check and set
+                                if(hasParent(WebDAVName_resourcetype))
+                                {
+                                    mbResourceTypeCollection = true;
+                                }
+                                break;
+                            }
+                            case WebDAVName_resourcetype:
+                            {
+                                // resourcetype end, check for collection
+                                if(hasParent(WebDAVName_prop))
+                                {
+                                    http_dav_ucp::DAVPropertyValue aDAVPropertyValue;
+
+                                    aDAVPropertyValue.Name = "DAV:resourcetype";
+                                    aDAVPropertyValue.Value <<= (mbResourceTypeCollection ? OUString("collection") : OUString());
+                                    maPropStatProperties.push_back(aDAVPropertyValue);
+                                }
+                                break;
+                            }
+                            case WebDAVName_getcontentlength:
+                            {
+                                // getcontentlength end, safe if content is correct
+                                if(propertyIsReady())
+                                {
+                                    http_dav_ucp::DAVPropertyValue aDAVPropertyValue;
+
+                                    aDAVPropertyValue.Name = "DAV:getcontentlength";
+                                    aDAVPropertyValue.Value <<= mpContext->getWhiteSpace();
+                                    maPropStatProperties.push_back(aDAVPropertyValue);
+                                }
+                                break;
+                            }
+                            case WebDAVName_getcontenttype:
+                            {
+                                // getcontenttype end, safe if content is correct
+                                if(propertyIsReady())
+                                {
+                                    http_dav_ucp::DAVPropertyValue aDAVPropertyValue;
+
+                                    aDAVPropertyValue.Name = "DAV:getcontenttype";
+                                    aDAVPropertyValue.Value <<= mpContext->getWhiteSpace();
+                                    maPropStatProperties.push_back(aDAVPropertyValue);
+                                }
+                                break;
+                            }
+                            case WebDAVName_supportedlock:
+                            {
+                                // supportedlock end
+                                if(hasParent(WebDAVName_prop) && maLockEntries.hasElements())
+                                {
+                                    http_dav_ucp::DAVPropertyValue aDAVPropertyValue;
+
+                                    aDAVPropertyValue.Name = "DAV:supportedlock";
+                                    aDAVPropertyValue.Value <<= maLockEntries;
+                                    maPropStatProperties.push_back(aDAVPropertyValue);
+                                }
+                                break;
+                            }
+                            case WebDAVName_lockentry:
+                            {
+                                // lockentry end
+                                if(hasParent(WebDAVName_supportedlock) && (mbLockScopeSet && mbLockTypeSet))
+                                {
+                                    const sal_Int32 nLength(maLockEntries.getLength());
+                                    ucb::LockEntry aEntry;
+
+                                    aEntry.Scope = maLockScope;
+                                    aEntry.Type = maLockType;
+                                    maLockEntries.realloc(nLength + 1);
+                                    maLockEntries.getArray()[nLength] = aEntry;
+                                }
+                                break;
+                            }
+                            case WebDAVName_owner:
+                            {
+                                maLock.Owner <<= mpContext->getWhiteSpace();
+                                break;
+                            }
+                            case WebDAVName_timeout:
+                            {
+                                const OUString sTimeout(mpContext->getWhiteSpace());
+                                if (sTimeout == "Infinite")
+                                    maLock.Timeout = -1;
+                                else if (sTimeout.startsWith("Second-"))
+                                    maLock.Timeout = o3tl::toInt64(sTimeout.subView(7));
+                                break;
+                            }
+                            case WebDAVName_locktoken:
+                            {
+                                const OUString sLockToken(maHref);
+                                SAL_WARN_IF(!sLockToken.startsWith("opaquelocktoken:"), "ucb.ucp.webdav",
+                                        "Parser error: wrong 'locktoken' value.");
+                                const sal_Int32 nLength(maLock.LockTokens.getLength());
+                                maLock.LockTokens.realloc(nLength+1);
+                                maLock.LockTokens.getArray()[nLength] = sLockToken;
+                                break;
+                            }
+                            case WebDAVName_exclusive:
+                            {
+                                // exclusive lockscope end
+                                if(hasParent(WebDAVName_lockscope))
+                                {
+                                    maLockScope = ucb::LockScope_EXCLUSIVE;
+                                    mbLockScopeSet = true;
+                                }
+                                break;
+                            }
+                            case WebDAVName_shared:
+                            {
+                                // shared lockscope end
+                                if(hasParent(WebDAVName_lockscope))
+                                {
+                                    maLockScope = ucb::LockScope_SHARED;
+                                    mbLockScopeSet = true;
+                                }
+                                break;
+                            }
+                            case WebDAVName_write:
+                            {
+                                // write locktype end
+                                if(hasParent(WebDAVName_locktype))
+                                {
+                                    maLockType = ucb::LockType_WRITE;
+                                    mbLockTypeSet = true;
+                                }
+                                break;
+                            }
+                            case WebDAVName_depth:
+                            {
+                                OUString const chars(mpContext->getWhiteSpace());
+                                if (chars == "0")
+                                {
+                                    maLock.Depth = ucb::LockDepth_ZERO;
+                                }
+                                else if (chars == "1")
+                                {
+                                    maLock.Depth = ucb::LockDepth_ONE;
+                                }
+                                else if (chars == "infinity")
+                                {
+                                    maLock.Depth = ucb::LockDepth_INFINITY;
+                                }
+                                break;
+                            }
+                            case WebDAVName_activelock:
+                            {
+                                maLock.Type = maLockType;
+                                maLock.Scope = maLockScope;
+                                maResult_Lock.push_back(maLock);
+                                break;
+                            }
+                            case WebDAVName_lockdiscovery:
+                            {
+                                // lockdiscovery may be requested via PROPFIND,
+                                // in addition to LOCK! so return it 2 ways
+                                if (isCollectingProperties())
+                                {
+                                    http_dav_ucp::DAVPropertyValue aDAVPropertyValue;
+
+                                    aDAVPropertyValue.Name = "DAV:lockdiscovery";
+                                    aDAVPropertyValue.Value <<= ::comphelper::containerToSequence(maResult_Lock);
+                                    maPropStatProperties.push_back(aDAVPropertyValue);
+                                }
+                                break;
+                            }
+                            case WebDAVName_propstat:
+                            {
+                                // propstat end, check status
+                                if(maStatus.getLength())
+                                {
+                                    if(maStatus == "HTTP/1.1 200 OK")
+                                    {
+                                        if(isCollectingProperties())
+                                        {
+                                            if(!maPropStatProperties.empty())
+                                            {
+                                                // append to maResponseProperties if okay
+                                                maResponseProperties.insert(maResponseProperties.end(), maPropStatProperties.begin(), maPropStatProperties.end());
+                                            }
+                                        }
+                                        else
+                                        {
+                                            if(!maPropStatNames.empty())
+                                            {
+                                                // when collecting properties append to
+                                                maResponseNames.insert(maResponseNames.end(), maPropStatNames.begin(), maPropStatNames.end());
+                                            }
+                                        }
+                                    }
+                                }
+                                break;
+                            }
+                            case WebDAVName_response:
+                            {
+                                // response end
+                                if(maHref.getLength())
+                                {
+                                    if(isCollectingProperties())
+                                    {
+                                        // create DAVResource when we have content
+                                        if(!maResponseProperties.empty())
+                                        {
+                                            http_dav_ucp::DAVResource aDAVResource;
+
+                                            aDAVResource.uri = maHref;
+                                            aDAVResource.properties = maResponseProperties;
+                                            maResult_PropFind.push_back(aDAVResource);
+                                        }
+                                    }
+                                    else
+                                    {
+                                        // when collecting properties add them to result when there are some
+                                        if(!maResponseNames.empty())
+                                        {
+                                            http_dav_ucp::DAVResourceInfo aDAVResourceInfo;
+
+                                            aDAVResourceInfo.properties = maResponseNames;
+                                            maResult_PropName.push_back(aDAVResourceInfo);
+                                        }
+                                    }
+                                }
+                                break;
+                            }
+                        }
+                        break;
+                    }
+                    case WebDAVNamespace_ucb_openoffice_org_dav_props:
+                    {
+                        switch(mpContext->getWebDAVName())
+                        {
+                            case WebDAVName_type:
+                            {
+                                m_UCBType = mpContext->getWhiteSpace();
+                                break;
+                            }
+                            case WebDAVName_value:
+                            {
+                                m_UCBValue = mpContext->getWhiteSpace();
+                                break;
+                            }
+                            case WebDAVName_ucbprop:
+                            {
+                                if (!m_UCBType.isEmpty()
+                                    && isCollectingProperties())
+                                {
+                                    http_dav_ucp::DAVPropertyValue aDAVPropertyValue;
+                                    aDAVPropertyValue.Name = MakePropertyName(*mpContext->getParent());
+                                    if (UCBDeadPropertyValue::createFromXML(m_UCBType, m_UCBValue, aDAVPropertyValue.Value))
+                                    {
+                                        maPropStatProperties.push_back(aDAVPropertyValue);
+                                    }
+                                    else
+                                    {
+                                        SAL_INFO("ucb.ucp.webdav.curl", "cannot parse property value");
+                                    }
+                                }
+                                m_UCBType.clear();
+                                m_UCBValue.clear();
+                                break;
+                            }
+                            default:
+                            break;
+                        }
+                        break;
+                    }
+                }
+            }
+
+            // destroy last context (pop)
+            pop_context();
+        }
+    }
+
+    void SAL_CALL WebDAVResponseParser::characters( const OUString& aChars )
+    {
+        // collect whitespace over evtl. several calls in mpContext
+        SAL_WARN_IF(!mpContext, "ucb.ucp.webdav", "Parser characters without content (!)");
+        const sal_Int32 nLen(aChars.getLength());
+
+        if(mpContext && nLen)
+        {
+            // remove leading/trailing blanks and CRLF
+            const OUString aTrimmedChars(aChars.trim());
+
+            if(aTrimmedChars.getLength())
+            {
+                OUString aNew(mpContext->getWhiteSpace());
+
+                if(aNew.getLength())
+                {
+                    // add one char when appending (see html1.1 spec)
+                    aNew += " ";
+                }
+
+                aNew += aTrimmedChars;
+                mpContext->setWhiteSpace(aNew);
+            }
+        }
+    }
+
+    void SAL_CALL WebDAVResponseParser::ignorableWhitespace( const OUString& /*aWhitespaces*/ )
+    {
+    }
+
+    void SAL_CALL WebDAVResponseParser::processingInstruction( const OUString& /*aTarget*/, const OUString& /*aData*/ )
+    {
+    }
+
+    void SAL_CALL WebDAVResponseParser::setDocumentLocator( const uno::Reference< xml::sax::XLocator >& /*xLocator*/ )
+    {
+    }
+} // end of anonymous namespace
+
+
+// wrapper for various calls to the parser
+
+namespace
+{
+    template<typename T>
+    void parseWebDAVResponse(
+        const uno::Reference< io::XInputStream >& xInputStream,
+        std::vector< T >& rResult,
+        WebDAVResponseParserMode eWebDAVResponseParserMode,
+        std::vector<T> const & (WebDAVResponseParser::* fn)() const)
+    {
+        if(xInputStream.is())
+        {
+            try
+            {
+                // prepare ParserInputSource
+                xml::sax::InputSource myInputSource;
+                myInputSource.aInputStream = xInputStream;
+
+                // get parser
+                uno::Reference< xml::sax::XParser > xParser = xml::sax::Parser::create(
+                    comphelper::getProcessComponentContext() );
+
+                // create parser; connect parser and filter
+                rtl::Reference<WebDAVResponseParser> const pWebDAVResponseParser(
+                        new WebDAVResponseParser(eWebDAVResponseParserMode));
+                uno::Reference< xml::sax::XDocumentHandler > xWebDAVHdl(pWebDAVResponseParser);
+                xParser->setDocumentHandler(xWebDAVHdl);
+
+                // finally, parse the stream
+                xParser->parseStream(myInputSource);
+
+                // get result
+                rResult = (pWebDAVResponseParser.get()->*fn)();
+            }
+            catch(uno::Exception&)
+            {
+                SAL_WARN("ucb.ucp.webdav", "WebDAV Parse error (!)");
+            }
+        }
+    }
+} // end of anonymous namespace
+
+
+// helper to parse a XML WebDAV response
+
+namespace http_dav_ucp
+{
+    std::vector< ucb::Lock > parseWebDAVLockResponse(const uno::Reference< io::XInputStream >& xInputStream)
+    {
+        std::vector< ucb::Lock > aResult;
+        parseWebDAVResponse< ucb::Lock >(xInputStream, aResult, WebDAVResponseParserMode_Lock, &WebDAVResponseParser::getResult_Lock);
+        return aResult;
+    }
+
+    std::vector< DAVResource > parseWebDAVPropFindResponse(const uno::Reference< io::XInputStream >& xInputStream)
+    {
+        std::vector< DAVResource > aResult;
+        parseWebDAVResponse< DAVResource >(xInputStream, aResult, WebDAVResponseParserMode_PropFind, &WebDAVResponseParser::getResult_PropFind);
+        return aResult;
+    }
+
+    std::vector< DAVResourceInfo > parseWebDAVPropNameResponse(const uno::Reference< io::XInputStream >& xInputStream)
+    {
+        std::vector< DAVResourceInfo > aResult;
+        parseWebDAVResponse< DAVResourceInfo >(xInputStream, aResult, WebDAVResponseParserMode_PropName, &WebDAVResponseParser::getResult_PropName);
+        return aResult;
+    }
+} // namespace http_dav_ucp
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/webdavresponseparser.hxx b/ucb/source/ucp/webdav-curl/webdavresponseparser.hxx
new file mode 100644
index 000000000..c62cb3205
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/webdavresponseparser.hxx
@@ -0,0 +1,38 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <com/sun/star/uno/Reference.hxx>
+#include <com/sun/star/io/XInputStream.hpp>
+#include <com/sun/star/ucb/Lock.hpp>
+#include "DAVResource.hxx"
+#include <vector>
+
+namespace http_dav_ucp
+{
+std::vector<css::ucb::Lock>
+parseWebDAVLockResponse(const css::uno::Reference<css::io::XInputStream>& xInputStream);
+std::vector<DAVResource>
+parseWebDAVPropFindResponse(const css::uno::Reference<css::io::XInputStream>& xInputStream);
+std::vector<DAVResourceInfo>
+parseWebDAVPropNameResponse(const css::uno::Reference<css::io::XInputStream>& xInputStream);
+} // namespace http_dav_ucp
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/webdavresultset.cxx b/ucb/source/ucp/webdav-curl/webdavresultset.cxx
new file mode 100644
index 000000000..e67dd1558
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/webdavresultset.cxx
@@ -0,0 +1,76 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+/**************************************************************************
+                                TODO
+ **************************************************************************
+
+ - This implementation is not a dynamic result set!!! It only implements
+   the necessary interfaces, but never recognizes/notifies changes!!!
+
+ *************************************************************************/
+#include "webdavresultset.hxx"
+
+using namespace com::sun::star;
+using namespace http_dav_ucp;
+
+
+// DynamicResultSet Implementation.
+
+
+DynamicResultSet::DynamicResultSet(
+                const uno::Reference< uno::XComponentContext >& rxContext,
+                const rtl::Reference< Content >& rxContent,
+                const ucb::OpenCommandArgument2& rCommand,
+                const uno::Reference< ucb::XCommandEnvironment >& rxEnv )
+: ResultSetImplHelper( rxContext, rCommand ),
+  m_xContent( rxContent ),
+  m_xEnv( rxEnv )
+{
+}
+
+
+// Non-interface methods.
+
+
+void DynamicResultSet::initStatic()
+{
+    m_xResultSet1
+        = new ::ucbhelper::ResultSet( m_xContext,
+                                      m_aCommand.Properties,
+                                      new DataSupplier( m_xContext,
+                                                        m_xContent,
+                                                        m_aCommand.Mode ),
+                                      m_xEnv );
+}
+
+
+void DynamicResultSet::initDynamic()
+{
+    m_xResultSet1
+        = new ::ucbhelper::ResultSet( m_xContext,
+                                      m_aCommand.Properties,
+                                      new DataSupplier( m_xContext,
+                                                        m_xContent,
+                                                        m_aCommand.Mode ),
+                                      m_xEnv );
+    m_xResultSet2 = m_xResultSet1;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/webdavresultset.hxx b/ucb/source/ucp/webdav-curl/webdavresultset.hxx
new file mode 100644
index 000000000..0a52d7982
--- /dev/null
+++ b/ucb/source/ucp/webdav-curl/webdavresultset.hxx
@@ -0,0 +1,48 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#pragma once
+
+#include <rtl/ref.hxx>
+#include <ucbhelper/resultsethelper.hxx>
+#include "webdavcontent.hxx"
+#include "webdavdatasupplier.hxx"
+
+namespace http_dav_ucp {
+
+class DynamicResultSet : public ::ucbhelper::ResultSetImplHelper
+{
+    rtl::Reference< Content > m_xContent;
+    css::uno::Reference< css::ucb::XCommandEnvironment > m_xEnv;
+
+private:
+    virtual void initStatic() override;
+    virtual void initDynamic() override;
+
+public:
+    DynamicResultSet( const css::uno::Reference< css::uno::XComponentContext >& rxContext,
+                      const rtl::Reference< Content >& rxContent,
+                      const css::ucb::OpenCommandArgument2& rCommand,
+                      const css::uno::Reference< css::ucb::XCommandEnvironment >& rxEnv );
+};
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */