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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:01:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:01:30 +0000
commit6beeb1b708550be0d4a53b272283e17e5e35fe17 (patch)
tree1ce8673d4aaa948e5554000101f46536a1e4cc29 /docs/manual/mod/mod_substitute.html.en
parentInitial commit. (diff)
downloadapache2-6beeb1b708550be0d4a53b272283e17e5e35fe17.tar.xz
apache2-6beeb1b708550be0d4a53b272283e17e5e35fe17.zip
Adding upstream version 2.4.57.upstream/2.4.57upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head>
+<meta content="text/html; charset=UTF-8" http-equiv="Content-Type" />
+<!--
+ XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+ This file is generated from xml source: DO NOT EDIT
+ XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+ -->
+<title>mod_substitute - Apache HTTP Server Version 2.4</title>
+<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
+<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
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+</script>
+
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+<body>
+<div id="page-header">
+<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
+<p class="apache">Apache HTTP Server Version 2.4</p>
+<img alt="" src="../images/feather.png" /></div>
+<div class="up"><a href="./"><img title="&lt;-" alt="&lt;-" src="../images/left.gif" /></a></div>
+<div id="path">
+<a href="http://www.apache.org/">Apache</a> &gt; <a href="http://httpd.apache.org/">HTTP Server</a> &gt; <a href="http://httpd.apache.org/docs/">Documentation</a> &gt; <a href="../">Version 2.4</a> &gt; <a href="./">Modules</a></div>
+<div id="page-content">
+<div id="preamble"><h1>Apache Module mod_substitute</h1>
+<div class="toplang">
+<p><span>Available Languages: </span><a href="../en/mod/mod_substitute.html" title="English">&nbsp;en&nbsp;</a> |
+<a href="../fr/mod/mod_substitute.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a></p>
+</div>
+<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Perform search and replace operations on response bodies</td></tr>
+<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
+<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>substitute_module</td></tr>
+<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_substitute.c</td></tr>
+<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache HTTP Server 2.2.7 and later</td></tr></table>
+<h3>Summary</h3>
+
+ <p><code class="module"><a href="../mod/mod_substitute.html">mod_substitute</a></code> provides a mechanism to perform
+ both regular expression and fixed string substitutions on
+ response bodies.</p>
+</div>
+<div id="quickview"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><h3 class="directives">Directives</h3>
+<ul id="toc">
+<li><img alt="" src="../images/down.gif" /> <a href="#substitute">Substitute</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#substituteinheritbefore">SubstituteInheritBefore</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#substitutemaxlinelength">SubstituteMaxLineLength</a></li>
+</ul>
+<h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&amp;list_id=144532&amp;product=Apache%20httpd-2&amp;query_format=specific&amp;order=changeddate%20DESC%2Cpriority%2Cbug_severity&amp;component=mod_substitute">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&amp;component=mod_substitute">Report a bug</a></li></ul><h3>See also</h3>
+<ul class="seealso">
+<li><a href="#comments_section">Comments</a></li></ul></div>
+
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="directive-section"><h2><a name="Substitute" id="Substitute">Substitute</a> <a name="substitute" id="substitute">Directive</a></h2>
+<table class="directive">
+<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Pattern to filter the response content</td></tr>
+<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>Substitute <var>s/pattern/substitution/[infq]</var></code></td></tr>
+<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory, .htaccess</td></tr>
+<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
+<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
+<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_substitute</td></tr>
+</table>
+ <p>The <code class="directive">Substitute</code> directive specifies a
+ search and replace pattern to apply to the response body.</p>
+
+ <p>The meaning of the pattern can be modified by using any
+ combination of these flags:</p>
+
+ <dl>
+ <dt><code>i</code></dt>
+ <dd>Perform a case-insensitive match.</dd>
+ <dt><code>n</code></dt>
+ <dd>By default the pattern is treated as a regular expression.
+ Using the <code>n</code> flag forces the pattern to be treated
+ as a fixed string.</dd>
+ <dt><code>f</code></dt>
+ <dd>The <code>f</code> flag causes <code>mod_substitute</code> to flatten the
+ result of a substitution allowing for later substitutions to
+ take place on the boundary of this one. This is the default.</dd>
+ <dt><code>q</code></dt>
+ <dd>The <code>q</code> flag causes <code>mod_substitute</code> to not
+ flatten the buckets after each substitution. This can
+ result in much faster response and a decrease in memory
+ utilization, but should only be used if there is no possibility
+ that the result of one substitution will ever match a pattern
+ or regex of a subsequent one.</dd>
+ </dl>
+
+ <p>The <var>substitution</var> may contain literal text and regular
+ expression backreferences</p>
+
+ <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">&lt;Location "/"&gt;
+ AddOutputFilterByType SUBSTITUTE text/html
+ Substitute "s/foo/bar/ni"
+&lt;/Location&gt;</pre>
+</div>
+
+ <p>The character which is used to separate (or "delimit") the
+ various parts of the substitution string is referred to as the
+ "delimiter", and it is most common to use a slash for this
+ purpose.</p>
+
+ <p>If either the pattern or the substitution contain a slash
+ character then an alternative delimiter may be used to make the
+ directive more readable:</p>
+
+ <div class="example"><h3>Example of using an alternate delimiter</h3><pre class="prettyprint lang-config">&lt;Location "/"&gt;
+ AddOutputFilterByType SUBSTITUTE text/html
+ Substitute "s|&lt;BR */?&gt;|&lt;br /&gt;|i"
+&lt;/Location&gt;</pre>
+</div>
+
+ <p>Backreferences can be used in the comparison and in the substitution,
+ when regular expressions are used, as illustrated in the following example: </p>
+ <div class="example"><h3>Example of using backreferences and captures</h3><pre class="prettyprint lang-config">&lt;Location "/"&gt;
+ AddOutputFilterByType SUBSTITUTE text/html
+ # "foo=k,bar=k" -&gt; "foo/bar=k"
+ Substitute "s|foo=(\w+),bar=\1|foo/bar=$1|"
+&lt;/Location&gt;</pre>
+</div>
+
+ <p>A common use scenario for <code>mod_substitute</code> is the
+ situation in which a front-end server proxies requests to a back-end
+ server which returns HTML with hard-coded embedded URLs that refer
+ to the back-end server. These URLs don't work for the end-user,
+ since the back-end server is unreachable.</p>
+
+ <p>In this case, <code>mod_substitute</code> can be used to rewrite
+ those URLs into something that will work from the front end:</p>
+
+ <div class="example"><h3>Rewriting URLs embedded in proxied content</h3><pre class="prettyprint lang-config">ProxyPass "/blog/" "http://internal.blog.example.com/"
+ProxyPassReverse "/blog/" "http://internal.blog.example.com/"
+
+Substitute "s|http://internal.blog.example.com/|http://www.example.com/blog/|i"</pre>
+</div>
+
+ <p><code class="directive"><a href="../mod/mod_proxy.html#proxypassreverse">ProxyPassReverse</a></code>
+ modifies any <code>Location</code> (redirect) headers that are sent
+ by the back-end server, and, in this example,
+ <code class="directive">Substitute</code> takes care of the rest of the problem by
+ fixing up the HTML response as well.</p>
+
+
+</div>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="directive-section"><h2><a name="SubstituteInheritBefore" id="SubstituteInheritBefore">SubstituteInheritBefore</a> <a name="substituteinheritbefore" id="substituteinheritbefore">Directive</a></h2>
+<table class="directive">
+<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Change the merge order of inherited patterns</td></tr>
+<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SubstituteInheritBefore on|off</code></td></tr>
+<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SubstituteInheritBefore off</code></td></tr>
+<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory, .htaccess</td></tr>
+<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
+<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
+<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_substitute</td></tr>
+<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in httpd 2.4.17 and later</td></tr>
+</table>
+ <p>Whether to apply the inherited <code class="directive"><a href="#substitute">Substitute</a></code>
+ patterns first (<code>on</code>), or after the ones of the current
+ context (<code>off</code>).
+ <code class="directive">SubstituteInheritBefore</code> is itself inherited,
+ hence contexts that inherit it (those that don't specify their own
+ <code class="directive">SubstituteInheritBefore</code> value) will apply the
+ closest defined merge order.</p>
+
+</div>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="directive-section"><h2><a name="SubstituteMaxLineLength" id="SubstituteMaxLineLength">SubstituteMaxLineLength</a> <a name="substitutemaxlinelength" id="substitutemaxlinelength">Directive</a></h2>
+<table class="directive">
+<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Set the maximum line size</td></tr>
+<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SubstituteMaxLineLength <var>bytes</var>(b|B|k|K|m|M|g|G)</code></td></tr>
+<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SubstituteMaxLineLength 1m</code></td></tr>
+<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory, .htaccess</td></tr>
+<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
+<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
+<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_substitute</td></tr>
+<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in httpd 2.4.11 and later</td></tr>
+</table>
+ <p>The maximum line size handled by <code class="module"><a href="../mod/mod_substitute.html">mod_substitute</a></code>
+ is limited to restrict memory use. The limit can be configured
+ using <code class="directive">SubstituteMaxLineLength</code>.
+ The value can be given as the number of bytes and can be suffixed
+ with a single letter <code>b</code>, <code>B</code>, <code>k</code>,
+ <code>K</code>, <code>m</code>, <code>M</code>, <code>g</code>,
+ <code>G</code> to provide the size in bytes, kilobytes, megabytes
+ or gigabytes respectively.</p>
+
+ <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">&lt;Location "/"&gt;
+ AddOutputFilterByType SUBSTITUTE text/html
+ SubstituteMaxLineLength 10m
+ Substitute "s/foo/bar/ni"
+&lt;/Location&gt;</pre>
+</div>
+
+
+</div>
+</div>
+<div class="bottomlang">
+<p><span>Available Languages: </span><a href="../en/mod/mod_substitute.html" title="English">&nbsp;en&nbsp;</a> |
+<a href="../fr/mod/mod_substitute.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a></p>
+</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&amp;A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Libera.chat, or sent to our <a href="https://httpd.apache.org/lists.html">mailing lists</a>.</div>
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