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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-07 02:04:06 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-07 02:04:06 +0000 |
| commit | 5dff2d61cc1c27747ee398e04d8e02843aabb1f8 (patch) | |
| tree | a67c336b406c8227bac912beb74a1ad3cdc55100 /docs/manual/mod/mod_rewrite.html.en | |
| parent | Initial commit. (diff) | |
| download | apache2-5dff2d61cc1c27747ee398e04d8e02843aabb1f8.tar.xz apache2-5dff2d61cc1c27747ee398e04d8e02843aabb1f8.zip | |
Adding upstream version 2.4.38.upstream/2.4.38upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'docs/manual/mod/mod_rewrite.html.en')
| -rw-r--r-- | docs/manual/mod/mod_rewrite.html.en | 1566 |
1 files changed, 1566 insertions, 0 deletions
diff --git a/docs/manual/mod/mod_rewrite.html.en b/docs/manual/mod/mod_rewrite.html.en new file mode 100644 index 0000000..5de13b8 --- /dev/null +++ b/docs/manual/mod/mod_rewrite.html.en @@ -0,0 +1,1566 @@ +<?xml version="1.0" encoding="ISO-8859-1"?> +<!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=ISO-8859-1" http-equiv="Content-Type" /> +<!-- + XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + This file is generated from xml source: DO NOT EDIT + XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + --> +<title>mod_rewrite - 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" /> +<link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="../style/css/prettify.css" /> +<script src="../style/scripts/prettify.min.js" type="text/javascript"> +</script> + +<link href="../images/favicon.ico" rel="shortcut icon" /></head> +<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="<-" alt="<-" src="../images/left.gif" /></a></div> +<div id="path"> +<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.4</a> > <a href="./">Modules</a></div> +<div id="page-content"> +<div id="preamble"><h1>Apache Module mod_rewrite</h1> +<div class="toplang"> +<p><span>Available Languages: </span><a href="../en/mod/mod_rewrite.html" title="English"> en </a> | +<a href="../fr/mod/mod_rewrite.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p> +</div> +<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Provides a rule-based rewriting engine to rewrite requested +URLs on the fly</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>rewrite_module</td></tr> +<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_rewrite.c</td></tr></table> +<h3>Summary</h3> + + <p>The <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> module uses a rule-based rewriting + engine, based on a PCRE regular-expression parser, to rewrite requested URLs on + the fly. By default, <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> maps a URL to a filesystem + path. However, it can also be used to redirect one URL to another URL, or + to invoke an internal proxy fetch.</p> + <p><code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> provides a flexible and powerful way to + manipulate URLs using an unlimited number of rules. Each rule can have an + unlimited number of attached rule conditions, to allow you to rewrite URL + based on server variables, environment variables, HTTP headers, or time + stamps.</p> + <p><code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> operates on the full URL path, including the + path-info section. A rewrite rule can be invoked in + <code>httpd.conf</code> or in <code>.htaccess</code>. The path generated + by a rewrite rule can include a query string, or can lead to internal + sub-processing, external request redirection, or internal proxy + throughput.</p> + + <p>Further details, discussion, and examples, are provided in the + <a href="../rewrite/">detailed mod_rewrite documentation</a>.</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>Topics</h3> +<ul id="topics"> +<li><img alt="" src="../images/down.gif" /> <a href="#logging">Logging</a></li> +</ul><h3 class="directives">Directives</h3> +<ul id="toc"> +<li><img alt="" src="../images/down.gif" /> <a href="#rewritebase">RewriteBase</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#rewritecond">RewriteCond</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#rewriteengine">RewriteEngine</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#rewritemap">RewriteMap</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#rewriteoptions">RewriteOptions</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#rewriterule">RewriteRule</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__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_rewrite">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_rewrite">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="section"> +<h2><a name="logging" id="logging">Logging</a></h2> + + <p><code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> offers detailed logging of its actions + at the <code>trace1</code> to <code>trace8</code> log levels. The + log level can be set specifically for <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> + using the <code class="directive"><a href="../mod/core.html#loglevel">LogLevel</a></code> directive: Up to + level <code>debug</code>, no actions are logged, while <code>trace8</code> + means that practically all actions are logged.</p> + + <div class="note"> + Using a high trace log level for <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> + will slow down your Apache HTTP Server dramatically! Use a log + level higher than <code>trace2</code> only for debugging! + </div> + + <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">LogLevel alert rewrite:trace3</pre> +</div> + + <div class="note"><h3>RewriteLog</h3> + <p>Those familiar with earlier versions of + <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> will no doubt be looking for the + <code>RewriteLog</code> and <code>RewriteLogLevel</code> + directives. This functionality has been completely replaced by the + new per-module logging configuration mentioned above. + </p> + + <p>To get just the <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code>-specific log + messages, pipe the log file through grep:</p> + <div class="example"><p><code> + tail -f error_log|fgrep '[rewrite:' + </code></p></div> + </div> + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="RewriteBase" id="RewriteBase">RewriteBase</a> <a name="rewritebase" id="rewritebase">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets the base URL for per-directory rewrites</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>RewriteBase <em>URL-path</em></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>None</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_rewrite</td></tr> +</table> + <p>The <code class="directive">RewriteBase</code> directive specifies the + URL prefix to be used for per-directory (htaccess) + <code class="directive"><a href="#rewriterule">RewriteRule</a></code> directives that + substitute a relative path.</p> + <p> This directive is <em>required</em> when you use a relative path + in a substitution in per-directory (htaccess) context unless any + of the following conditions are true:</p> + <ul> + <li> The original request, and the substitution, are underneath the + <code class="directive"><a href="../mod/core.html#documentroot">DocumentRoot</a></code> + (as opposed to reachable by other means, such as + <code class="directive"><a href="../mod/mod_alias.html#alias">Alias</a></code>).</li> + <li> The <em>filesystem</em> path to the directory containing the + <code class="directive"><a href="#rewriterule">RewriteRule</a></code>, + suffixed by the relative + substitution is also valid as a URL path on the server + (this is rare).</li> + <li> In Apache HTTP Server 2.4.16 and later, this directive may be + omitted when the request is mapped via + <code class="directive"><a href="../mod/mod_alias.html#alias">Alias</a></code> + or <code class="module"><a href="../mod/mod_userdir.html">mod_userdir</a></code>.</li> + </ul> + +<p> In the example below, <code class="directive">RewriteBase</code> is necessary + to avoid rewriting to http://example.com/opt/myapp-1.2.3/welcome.html + since the resource was not relative to the document root. This + misconfiguration would normally cause the server to look for an "opt" + directory under the document root.</p> +<pre class="prettyprint lang-config">DocumentRoot "/var/www/example.com" +AliasMatch "^/myapp" "/opt/myapp-1.2.3" +<Directory "/opt/myapp-1.2.3"> + RewriteEngine On + RewriteBase "/myapp/" + RewriteRule "^index\.html$" "welcome.html" +</Directory></pre> + + + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="RewriteCond" id="RewriteCond">RewriteCond</a> <a name="rewritecond" id="rewritecond">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Defines a condition under which rewriting will take place +</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code> RewriteCond + <em>TestString</em> <em>CondPattern</em> [<em>flags</em>]</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr> +<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_rewrite</td></tr> +</table> + <p>The <code class="directive">RewriteCond</code> directive defines a + rule condition. One or more <code class="directive">RewriteCond</code> + can precede a <code class="directive"><a href="#rewriterule">RewriteRule</a></code> + directive. The following rule is then only used if both + the current state of the URI matches its pattern, <strong>and</strong> if these conditions are met.</p> + + <p><em>TestString</em> is a string which can contain the + following expanded constructs in addition to plain text:</p> + + <ul> + <li> + <strong>RewriteRule backreferences</strong>: These are + backreferences of the form <strong><code>$N</code></strong> + (0 <= N <= 9). $1 to $9 provide access to the grouped + parts (in parentheses) of the pattern, from the + <code>RewriteRule</code> which is subject to the current + set of <code>RewriteCond</code> conditions. $0 provides + access to the whole string matched by that pattern. + </li> + <li> + <strong>RewriteCond backreferences</strong>: These are + backreferences of the form <strong><code>%N</code></strong> + (0 <= N <= 9). %1 to %9 provide access to the grouped + parts (again, in parentheses) of the pattern, from the last matched + <code>RewriteCond</code> in the current set + of conditions. %0 provides access to the whole string matched by + that pattern. + </li> + <li> + <strong>RewriteMap expansions</strong>: These are + expansions of the form <strong><code>${mapname:key|default}</code></strong>. + See <a href="#mapfunc">the documentation for + RewriteMap</a> for more details. + </li> + <li> + <strong>Server-Variables</strong>: These are variables of + the form + <strong><code>%{</code> <em>NAME_OF_VARIABLE</em> + <code>}</code></strong> + where <em>NAME_OF_VARIABLE</em> can be a string taken + from the following list: + + <table> + + <tr> + <th>HTTP headers:</th> <th>connection & request:</th> <th /> + </tr> + + <tr> + <td> + HTTP_ACCEPT<br /> + HTTP_COOKIE<br /> + HTTP_FORWARDED<br /> + HTTP_HOST<br /> + HTTP_PROXY_CONNECTION<br /> + HTTP_REFERER<br /> + HTTP_USER_AGENT<br /> + </td> + + <td> + AUTH_TYPE<br /> + CONN_REMOTE_ADDR<br /> + CONTEXT_PREFIX<br /> + CONTEXT_DOCUMENT_ROOT<br /> + IPV6<br /> + PATH_INFO<br /> + QUERY_STRING<br /> + REMOTE_ADDR<br /> + REMOTE_HOST<br /> + REMOTE_IDENT<br /> + REMOTE_PORT<br /> + REMOTE_USER<br /> + REQUEST_METHOD<br /> + SCRIPT_FILENAME<br /> + </td> + + <td /> + </tr> + + <tr> + <th>server internals:</th> <th>date and time:</th> <th>specials:</th> + </tr> + + <tr> + <td> + DOCUMENT_ROOT<br /> + SCRIPT_GROUP<br /> + SCRIPT_USER<br /> + SERVER_ADDR<br /> + SERVER_ADMIN<br /> + SERVER_NAME<br /> + SERVER_PORT<br /> + SERVER_PROTOCOL<br /> + SERVER_SOFTWARE<br /> + </td> + + <td> + TIME_YEAR<br /> + TIME_MON<br /> + TIME_DAY<br /> + TIME_HOUR<br /> + TIME_MIN<br /> + TIME_SEC<br /> + TIME_WDAY<br /> + TIME<br /> + </td> + + <td> + API_VERSION<br /> + CONN_REMOTE_ADDR<br /> + HTTPS<br /> + IS_SUBREQ<br /> + REMOTE_ADDR<br /> + REQUEST_FILENAME<br /> + REQUEST_SCHEME<br /> + REQUEST_URI<br /> + THE_REQUEST<br /> + </td> + </tr> + </table> + + <p>These variables all + correspond to the similarly named HTTP + MIME-headers, C variables of the Apache HTTP Server or + <code>struct tm</code> fields of the Unix system. + Most are documented <a href="../expr.html#vars">here</a> + or elsewhere in the Manual or in the CGI specification.</p> + + <p>SERVER_NAME and SERVER_PORT depend on the values of + <code class="directive"><a href="../mod/core.html#usecanonicalname">UseCanonicalName</a></code> and + <code class="directive"><a href="../mod/core.html#usecanonicalphysicalport">UseCanonicalPhysicalPort</a></code> + respectively.</p> + + <p>Those that are special to <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> include those below.</p> + <dl> + <dt><code>API_VERSION</code></dt> + + <dd>This is the version of the Apache httpd module API + (the internal interface between server and + module) in the current httpd build, as defined in + include/ap_mmn.h. The module API version + corresponds to the version of Apache httpd in use (in + the release version of Apache httpd 1.3.14, for + instance, it is 19990320:10), but is mainly of + interest to module authors.</dd> + + <dt><code>CONN_REMOTE_ADDR</code></dt> + + <dd>Since 2.4.8: The peer IP address of the connection (see the + <code class="module"><a href="../mod/mod_remoteip.html">mod_remoteip</a></code> module).</dd> + + <dt><code>HTTPS</code></dt> + + <dd>Will contain the text "on" if the connection is + using SSL/TLS, or "off" otherwise. (This variable + can be safely used regardless of whether or not + <code class="module"><a href="../mod/mod_ssl.html">mod_ssl</a></code> is loaded).</dd> + + <dt><code>IS_SUBREQ</code></dt> + + <dd>Will contain the text "true" if the request + currently being processed is a sub-request, + "false" otherwise. Sub-requests may be generated + by modules that need to resolve additional files + or URIs in order to complete their tasks.</dd> + + <dt><code>REMOTE_ADDR</code></dt> + + <dd>The IP address of the remote host (see the + <code class="module"><a href="../mod/mod_remoteip.html">mod_remoteip</a></code> module).</dd> + + <dt><code>REQUEST_FILENAME</code></dt> + + <dd>The full local filesystem path to the file or + script matching the request, if this has already + been determined by the server at the time + <code>REQUEST_FILENAME</code> is referenced. Otherwise, + such as when used in virtual host context, the same + value as <code>REQUEST_URI</code>. Depending on the value of + <code class="directive"><a href="../mod/core.html#acceptpathinfo">AcceptPathInfo</a></code>, the + server may have only used some leading components of the + <code>REQUEST_URI</code> to map the request to a file. + </dd> + + <dt><code>REQUEST_SCHEME</code></dt> + + <dd>Will contain the scheme of the request (usually + "http" or "https"). This value can be influenced with + <code class="directive"><a href="../mod/core.html#servername">ServerName</a></code>.</dd> + + <dt><code>REQUEST_URI</code></dt> + + <dd>The path component of the requested URI, + such as "/index.html". This notably excludes the + query string which is available as its own variable + named <code>QUERY_STRING</code>.</dd> + + <dt><code>THE_REQUEST</code></dt> + + <dd>The full HTTP request line sent by the + browser to the server (e.g., "<code>GET + /index.html HTTP/1.1</code>"). This does not + include any additional headers sent by the + browser. This value has not been unescaped + (decoded), unlike most other variables below.</dd> + + </dl> + </li> + </ul> + + <p>If the <em>TestString</em> has the special value <code>expr</code>, + the <em>CondPattern</em> will be treated as an + <a href="../expr.html">ap_expr</a>. HTTP headers referenced in the + expression will be added to the Vary header if the <code>novary</code> + flag is not given.</p> + + <p>Other things you should be aware of:</p> + + <ol> + <li> + <p>The variables SCRIPT_FILENAME and REQUEST_FILENAME + contain the same value - the value of the + <code>filename</code> field of the internal + <code>request_rec</code> structure of the Apache HTTP Server. + The first name is the commonly known CGI variable name + while the second is the appropriate counterpart of + REQUEST_URI (which contains the value of the + <code>uri</code> field of <code>request_rec</code>).</p> + <p>If a substitution occurred and the rewriting continues, + the value of both variables will be updated accordingly.</p> + <p>If used in per-server context (<em>i.e.</em>, before the + request is mapped to the filesystem) SCRIPT_FILENAME and + REQUEST_FILENAME cannot contain the full local filesystem + path since the path is unknown at this stage of processing. + Both variables will initially contain the value of REQUEST_URI + in that case. In order to obtain the full local filesystem + path of the request in per-server context, use an URL-based + look-ahead <code>%{LA-U:REQUEST_FILENAME}</code> to determine + the final value of REQUEST_FILENAME.</p></li> + + <li> + <code>%{ENV:variable}</code>, where <em>variable</em> can be + any environment variable, is also available. + This is looked-up via internal + Apache httpd structures and (if not found there) via + <code>getenv()</code> from the Apache httpd server process.</li> + + <li> + <code>%{SSL:variable}</code>, where <em>variable</em> is the + name of an <a href="mod_ssl.html#envvars">SSL environment + variable</a>, can be used whether or not + <code class="module"><a href="../mod/mod_ssl.html">mod_ssl</a></code> is loaded, but will always expand to + the empty string if it is not. Example: + <code>%{SSL:SSL_CIPHER_USEKEYSIZE}</code> may expand to + <code>128</code>. These variables are available even without + setting the <code>StdEnvVars</code> option of the + <code class="directive"><a href="../mod/mod_ssl.html#ssloptions">SSLOptions</a></code> directive.</li> + + <li> + <code>%{HTTP:header}</code>, where <em>header</em> can be + any HTTP MIME-header name, can always be used to obtain the + value of a header sent in the HTTP request. + Example: <code>%{HTTP:Proxy-Connection}</code> is + the value of the HTTP header + ``<code>Proxy-Connection:</code>''. + <p>If a HTTP header is used in a condition this header is added to + the Vary header of the response in case the condition evaluates + to true for the request. It is <strong>not</strong> added if the + condition evaluates to false for the request. Adding the HTTP header + to the Vary header of the response is needed for proper caching.</p> + <p>It has to be kept in mind that conditions follow a short circuit + logic in the case of the '<strong><code>ornext|OR</code></strong>' flag + so that certain conditions might not be evaluated at all.</p></li> + + <li> + <a id="LA-U" name="LA-U"><code>%{LA-U:variable}</code></a> + can be used for look-aheads which perform + an internal (URL-based) sub-request to determine the final + value of <em>variable</em>. This can be used to access + variable for rewriting which is not available at the current + stage, but will be set in a later phase. + <p>For instance, to rewrite according to the + <code>REMOTE_USER</code> variable from within the + per-server context (<code>httpd.conf</code> file) you must + use <code>%{LA-U:REMOTE_USER}</code> - this + variable is set by the authorization phases, which come + <em>after</em> the URL translation phase (during which + <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> operates).</p> + <p>On the other hand, because <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> implements + its per-directory context (<code>.htaccess</code> file) via + the Fixup phase of the API and because the authorization + phases come <em>before</em> this phase, you just can use + <code>%{REMOTE_USER}</code> in that context.</p></li> + + <li> + <code>%{LA-F:variable}</code> can be used to perform an internal + (filename-based) sub-request, to determine the final value + of <em>variable</em>. Most of the time, this is the same as + LA-U above.</li> + </ol> + + <p><em>CondPattern</em> is the condition pattern, + a regular expression which is applied to the + current instance of the <em>TestString</em>. + <em>TestString</em> is first evaluated, before being matched against + <em>CondPattern</em>.</p> + + <p><em>CondPattern</em> is usually a + <em>perl compatible regular expression</em>, but there is + additional syntax available to perform other useful tests against + the <em>Teststring</em>:</p> + + <ol> + <li>You can prefix the pattern string with a + '<code>!</code>' character (exclamation mark) to negate the result + of the condition, no matter what kind of <em>CondPattern</em> is used. + </li> + + <li> + You can perform lexicographical string comparisons: + + <dl> + <dt><strong><CondPattern</strong></dt> + <dd>Lexicographically precedes<br /> + Treats the <em>CondPattern</em> as a plain string and + compares it lexicographically to <em>TestString</em>. True if + <em>TestString</em> lexicographically precedes + <em>CondPattern</em>.</dd> + + <dt><strong>>CondPattern</strong></dt> + <dd>Lexicographically follows<br /> + Treats the <em>CondPattern</em> as a plain string and + compares it lexicographically to <em>TestString</em>. True if + <em>TestString</em> lexicographically follows + <em>CondPattern</em>.</dd> + + <dt><strong>=CondPattern</strong></dt> + <dd>Lexicographically equal<br /> + Treats the <em>CondPattern</em> as a plain string and + compares it lexicographically to <em>TestString</em>. True if + <em>TestString</em> is lexicographically equal to + <em>CondPattern</em> (the two strings are exactly + equal, character for character). If <em>CondPattern</em> + is <code>""</code> (two quotation marks) this + compares <em>TestString</em> to the empty string.</dd> + + <dt><strong><=CondPattern</strong></dt> + <dd>Lexicographically less than or equal to<br /> + Treats the <em>CondPattern</em> as a plain string and + compares it lexicographically to <em>TestString</em>. True + if <em>TestString</em> lexicographically precedes + <em>CondPattern</em>, or is equal to <em>CondPattern</em> + (the two strings are equal, character for character).</dd> + + <dt><strong>>=CondPattern</strong></dt> + <dd>Lexicographically greater than or equal to<br /> + Treats the <em>CondPattern</em> as a plain string and + compares it lexicographically to <em>TestString</em>. True + if <em>TestString</em> lexicographically follows + <em>CondPattern</em>, or is equal to <em>CondPattern</em> + (the two strings are equal, character for character).</dd> + </dl> + </li> + + <li> + You can perform integer comparisons: + <dl> + + <dt><strong>-eq</strong></dt> + <dd>Is numerically <strong>eq</strong>ual to<br /> + The <em>TestString</em> is treated as an integer, and is + numerically compared to the <em>CondPattern</em>. True if + the two are numerically equal.</dd> + + <dt><strong>-ge</strong></dt> + <dd>Is numerically <strong>g</strong>reater than or <strong>e</strong>qual to<br /> + The <em>TestString</em> is treated as an integer, and is + numerically compared to the <em>CondPattern</em>. True if + the <em>TestString</em> is numerically greater than or equal + to the <em>CondPattern</em>.</dd> + + <dt><strong>-gt</strong></dt> + <dd>Is numerically <strong>g</strong>reater <strong>t</strong>han<br /> + The <em>TestString</em> is treated as an integer, and is + numerically compared to the <em>CondPattern</em>. True if + the <em>TestString</em> is numerically greater than + the <em>CondPattern</em>.</dd> + + <dt><strong>-le</strong></dt> + <dd>Is numerically <strong>l</strong>ess than or <strong>e</strong>qual to<br /> + The <em>TestString</em> is treated as an integer, and is + numerically compared to the <em>CondPattern</em>. True if + the <em>TestString</em> is numerically less than or equal + to the <em>CondPattern</em>. Avoid confusion with the + <strong>-l</strong> by using the <strong>-L</strong> or + <strong>-h</strong> variant.</dd> + + <dt><strong>-lt</strong></dt> + <dd>Is numerically <strong>l</strong>ess <strong>t</strong>han<br /> + The <em>TestString</em> is treated as an integer, and is + numerically compared to the <em>CondPattern</em>. True if + the <em>TestString</em> is numerically less than + the <em>CondPattern</em>. Avoid confusion with the + <strong>-l</strong> by using the <strong>-L</strong> or + <strong>-h</strong> variant.</dd> + + <dt><strong>-ne</strong></dt> + <dd>Is numerically <strong>n</strong>ot <strong>e</strong>qual to<br /> + The <em>TestString</em> is treated as an integer, and is + numerically compared to the <em>CondPattern</em>. True if + the two are numerically different. This is equivalent to + <code>!-eq</code>.</dd> + + </dl> + </li> + + <li>You can perform various file attribute tests: + + + <dl> + + <dt><strong>-d</strong></dt> + + <dd>Is <strong>d</strong>irectory.<br /> + Treats the <em>TestString</em> as a pathname and tests + whether or not it exists, and is a directory. + </dd> + + <dt><strong>-f</strong></dt> + + <dd>Is regular <strong>f</strong>ile.<br /> + + Treats the <em>TestString</em> as a pathname and tests + whether or not it exists, and is a regular file. + </dd> + + <dt><strong>-F</strong></dt> + + <dd>Is existing file, via subrequest.<br /> + Checks whether or not <em>TestString</em> is a valid file, + accessible via all the server's currently-configured + access controls for that path. This uses an internal + subrequest to do the check, so use it with care - + it can impact your server's performance! + </dd> + + <dt><strong>-h</strong></dt> + <dd>Is symbolic link, bash convention.<br /> + See <strong>-l</strong>. + </dd> + + <dt><strong>-l</strong></dt> + + <dd>Is symbolic <strong>l</strong>ink.<br /> + Treats the <em>TestString</em> as a pathname and tests + whether or not it exists, and is a symbolic link. May also + use the bash convention of <strong>-L</strong> or + <strong>-h</strong> if there's a possibility of confusion + such as when using the <strong>-lt</strong> or + <strong>-le</strong> tests. + </dd> + + <dt><strong>-L</strong></dt> + <dd>Is symbolic link, bash convention.<br /> + See <strong>-l</strong>.</dd> + + <dt><strong>-s</strong></dt> + <dd>Is regular file, with <strong>s</strong>ize.<br /> + Treats the <em>TestString</em> as a pathname and tests + whether or not it exists, and is a regular file with size greater + than zero.</dd> + + <dt><strong>-U</strong></dt> + <dd><p>Is existing URL, via subrequest.<br /> + Checks whether or not <em>TestString</em> is a valid URL, + accessible via all the server's currently-configured + access controls for that path. This uses an internal + subrequest to do the check, so use it with care - + it can impact your server's performance!</p> + <p> This flag <em>only</em> returns information about things + like access control, authentication, and authorization. This flag + <em>does not</em> return information about the status code the + configured handler (static file, CGI, proxy, etc.) would have + returned.</p> </dd> + + <dt><strong>-x</strong></dt> + <dd>Has e<strong>x</strong>ecutable permissions.<br /> + Treats the <em>TestString</em> as a pathname and tests + whether or not it exists, and has executable permissions. + These permissions are determined according to + the underlying OS.</dd> + + </dl> + + For example: + + <pre class="prettyprint lang-config">RewriteCond /var/www/%{REQUEST_URI} !-f +RewriteRule ^(.+) /other/archive/$1 [R]</pre> + + + </li> + + <li> + <p>If the <em>TestString</em> has the special value <code>expr</code>, the + <em>CondPattern</em> will be treated as an + <a href="../expr.html">ap_expr</a>.</p> + + <p> + In the below example, <code>-strmatch</code> is used to + compare the <code>REFERER</code> against the site hostname, + to block unwanted hotlinking. + </p> + + <pre class="prettyprint lang-config">RewriteCond expr "! %{HTTP_REFERER} -strmatch '*://%{HTTP_HOST}/*'" +RewriteRule "^/images" "-" [F]</pre> + + </li> + </ol> + + <p>You can also set special flags for <em>CondPattern</em> by appending + <strong><code>[</code><em>flags</em><code>]</code></strong> + as the third argument to the <code class="directive">RewriteCond</code> + directive, where <em>flags</em> is a comma-separated list of any of the + following flags:</p> + + <ul> + <li>'<strong><code>nocase|NC</code></strong>' + (<strong>n</strong>o <strong>c</strong>ase)<br /> + This makes the test case-insensitive - differences + between 'A-Z' and 'a-z' are ignored, both in the + expanded <em>TestString</em> and the <em>CondPattern</em>. + This flag is effective only for comparisons between + <em>TestString</em> and <em>CondPattern</em>. It has no + effect on filesystem and subrequest checks.</li> + + <li> + '<strong><code>ornext|OR</code></strong>' + (<strong>or</strong> next condition)<br /> + Use this to combine rule conditions with a local OR + instead of the implicit AND. Typical example: + +<pre class="prettyprint lang-config">RewriteCond "%{REMOTE_HOST}" "^host1" [OR] +RewriteCond "%{REMOTE_HOST}" "^host2" [OR] +RewriteCond "%{REMOTE_HOST}" "^host3" +RewriteRule ...some special stuff for any of these hosts...</pre> + + + Without this flag you would have to write the condition/rule + pair three times. + </li> + + <li>'<strong><code>novary|NV</code></strong>' + (<strong>n</strong>o <strong>v</strong>ary)<br /> + If a HTTP header is used in the condition, this flag prevents + this header from being added to the Vary header of the response. <br /> + Using this flag might break proper caching of the response if + the representation of this response varies on the value of this header. + So this flag should be only used if the meaning of the Vary header + is well understood. + </li> + </ul> + + <p><strong>Example:</strong></p> + + <p>To rewrite the Homepage of a site according to the + ``<code>User-Agent:</code>'' header of the request, you can + use the following: </p> + +<pre class="prettyprint lang-config">RewriteCond "%{HTTP_USER_AGENT}" "(iPhone|Blackberry|Android)" +RewriteRule "^/$" "/homepage.mobile.html" [L] + +RewriteRule "^/$" "/homepage.std.html" [L]</pre> + + + <p>Explanation: If you use a browser which identifies itself + as a mobile browser (note that the example is incomplete, as + there are many other mobile platforms), the mobile version of + the homepage is served. Otherwise, the standard page is served. + </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="RewriteEngine" id="RewriteEngine">RewriteEngine</a> <a name="rewriteengine" id="rewriteengine">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enables or disables runtime rewriting engine</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>RewriteEngine on|off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>RewriteEngine off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, 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_rewrite</td></tr> +</table> + + <p>The <code class="directive">RewriteEngine</code> directive enables or + disables the runtime rewriting engine. If it is set to + <code>off</code> this module does no runtime processing at + all. It does not even update the <code>SCRIPT_URx</code> + environment variables.</p> + + <p>Use this directive to disable rules in a particular context, + rather than commenting out all the <code class="directive"><a href="#rewriterule">RewriteRule</a></code> directives.</p> + + <p>Note that rewrite configurations are not + inherited by virtual hosts. This means that you need to have a + <code>RewriteEngine on</code> directive for each virtual host + in which you wish to use rewrite rules.</p> + + <p><code class="directive"><a href="#rewritemap">RewriteMap</a></code> directives + of the type <code>prg</code> + are not started during server initialization if they're defined in a + context that does not have <code class="directive">RewriteEngine</code> set to + <code>on</code></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="RewriteMap" id="RewriteMap">RewriteMap</a> <a name="rewritemap" id="rewritemap">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Defines a mapping function for key-lookup</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>RewriteMap <em>MapName</em> <em>MapType</em>:<em>MapSource</em> + [<em>MapTypeOptions</em>] +</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</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_rewrite</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>The 3rd parameter, MapTypeOptions, in only available from Apache +2.4.29 and later</td></tr> +</table> + <p>The <code class="directive">RewriteMap</code> directive defines a + <em>Rewriting Map</em> which can be used inside rule + substitution strings by the mapping-functions to + insert/substitute fields through a key lookup. The source of + this lookup can be of various types.</p> + + <p>The <a id="mapfunc" name="mapfunc"><em>MapName</em></a> is + the name of the map and will be used to specify a + mapping-function for the substitution strings of a rewriting + rule via one of the following constructs:</p> + + <p class="indent"> + <strong><code>${</code> <em>MapName</em> <code>:</code> + <em>LookupKey</em> <code>}</code><br /> + <code>${</code> <em>MapName</em> <code>:</code> + <em>LookupKey</em> <code>|</code> <em>DefaultValue</em> + <code>}</code></strong> + </p> + + <p>When such a construct occurs, the map <em>MapName</em> is + consulted and the key <em>LookupKey</em> is looked-up. If the + key is found, the map-function construct is substituted by + <em>SubstValue</em>. If the key is not found then it is + substituted by <em>DefaultValue</em> or by the empty string + if no <em>DefaultValue</em> was specified. Empty values + behave as if the key was absent, therefore it is not possible + to distinguish between empty-valued keys and absent keys.</p> + + <p>For example, you might define a + <code class="directive">RewriteMap</code> as:</p> + + <pre class="prettyprint lang-config">RewriteMap examplemap "txt:/path/to/file/map.txt"</pre> + + + <p>You would then be able to use this map in a + <code class="directive"><a href="#rewriterule">RewriteRule</a></code> as follows:</p> + + <pre class="prettyprint lang-config">RewriteRule "^/ex/(.*)" "${examplemap:$1}"</pre> + + + <p>The meaning of the <em>MapTypeOptions</em> argument depends on + particular <em>MapType</em>. See the + <a href="../rewrite/rewritemap.html">Using RewriteMap</a> for + more information.</p> + + <p>The following combinations for <em>MapType</em> and + <em>MapSource</em> can be used:</p> + + <dl> + + <dt>txt</dt> + <dd>A plain text file containing space-separated key-value + pairs, one per line. (<a href="../rewrite/rewritemap.html#txt">Details ...</a>)</dd> + + <dt>rnd</dt> + <dd>Randomly selects an entry from a plain text file (<a href="../rewrite/rewritemap.html#rnd">Details ...</a>)</dd> + + <dt>dbm</dt> + <dd>Looks up an entry in a dbm file containing name, value + pairs. Hash is constructed from a plain text file format using + the <code><a href="../programs/httxt2dbm.html">httxt2dbm</a></code> + utility. (<a href="../rewrite/rewritemap.html#dbm">Details ...</a>)</dd> + + <dt>int</dt> + <dd>One of the four available internal functions provided by + <code>RewriteMap</code>: toupper, tolower, escape or + unescape. (<a href="../rewrite/rewritemap.html#int">Details ...</a>)</dd> + + <dt>prg</dt> + <dd>Calls an external program or script to process the + rewriting. (<a href="../rewrite/rewritemap.html#prg">Details ...</a>)</dd> + + <dt>dbd or fastdbd</dt> + <dd>A SQL SELECT statement to be performed to look up the + rewrite target. (<a href="../rewrite/rewritemap.html#dbd">Details ...</a>)</dd> + </dl> + + <p>Further details, and numerous examples, may be found in the <a href="../rewrite/rewritemap.html">RewriteMap HowTo</a></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="RewriteOptions" id="RewriteOptions">RewriteOptions</a> <a name="rewriteoptions" id="rewriteoptions">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets some special options for the rewrite engine</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>RewriteOptions <var>Options</var></code></td></tr> +<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, 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_rewrite</td></tr> +</table> + + <p>The <code class="directive">RewriteOptions</code> directive sets some + special options for the current per-server or per-directory + configuration. The <em>Option</em> string can currently + only be one of the following:</p> + + <dl> + <dt><code>Inherit</code></dt> + <dd> + + <p>This forces the current configuration to inherit the + configuration of the parent. In per-virtual-server context, + this means that the maps, conditions and rules of the main + server are inherited. In per-directory context this means + that conditions and rules of the parent directory's + <code>.htaccess</code> configuration or + <code class="directive"><a href="../mod/core.html#directory"><Directory></a></code> + sections are inherited. The inherited rules are virtually copied + to the section where this directive is being used. If used in + combination with local rules, the inherited rules are copied behind + the local rules. The position of this directive - below or above + of local rules - has no influence on this behavior. If local + rules forced the rewriting to stop, the inherited rules won't + be processed.</p> + + <div class="warning"> + Rules inherited from the parent scope are applied + <strong>after</strong> rules specified in the child scope. + </div> + </dd> + + <dt><code>InheritBefore</code></dt> + <dd> + <p> Like <code>Inherit</code> above, but the rules from the parent scope + are applied <strong>before</strong> rules specified in the child scope.<br /> + Available in Apache HTTP Server 2.3.10 and later.</p> + </dd> + + <dt><code>InheritDown</code></dt> + <dd> + + <p>If this option is enabled, all child configurations will inherit + the configuration of the current configuration. It is equivalent to + specifying <code>RewriteOptions Inherit</code> in all child + configurations. See the <code>Inherit</code> option for more details + on how the parent-child relationships are handled.<br /> + Available in Apache HTTP Server 2.4.8 and later.</p> + </dd> + + <dt><code>InheritDownBefore</code></dt> + <dd> + + <p>Like <code>InheritDown</code> above, but the rules from the current + scope are applied <strong>before</strong> rules specified in any child's + scope.<br /> + Available in Apache HTTP Server 2.4.8 and later.</p> + </dd> + + <dt><code>IgnoreInherit</code></dt> + <dd> + + <p>This option forces the current and child configurations to ignore + all rules that would be inherited from a parent specifying + <code>InheritDown</code> or <code>InheritDownBefore</code>.<br /> + Available in Apache HTTP Server 2.4.8 and later.</p> + </dd> + + <dt><code>AllowNoSlash</code></dt> + <dd> + <p>By default, <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> will ignore URLs that map to a + directory on disk but lack a trailing slash, in the expectation that + the <code class="module"><a href="../mod/mod_dir.html">mod_dir</a></code> module will issue the client with a redirect to + the canonical URL with a trailing slash.</p> + + <p>When the <code class="directive"><a href="../mod/mod_dir.html#directoryslash">DirectorySlash</a></code> directive + is set to off, the <code>AllowNoSlash</code> option can be enabled to ensure + that rewrite rules are no longer ignored. This option makes it possible to + apply rewrite rules within .htaccess files that match the directory without + a trailing slash, if so desired.<br /> + Available in Apache HTTP Server 2.4.0 and later.</p> + </dd> + + <dt><code>AllowAnyURI</code></dt> + <dd> + + <p>When <code class="directive"><a href="#rewriterule">RewriteRule</a></code> + is used in <code>VirtualHost</code> or server context with + version 2.2.22 or later of httpd, <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> + will only process the rewrite rules if the request URI is a <a href="directive-dict.html#Syntax">URL-path</a>. This avoids + some security issues where particular rules could allow + "surprising" pattern expansions (see <a href="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-3368">CVE-2011-3368</a> + and <a href="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-4317">CVE-2011-4317</a>). + To lift the restriction on matching a URL-path, the + <code>AllowAnyURI</code> option can be enabled, and + <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> will apply the rule set to any + request URI string, regardless of whether that string matches + the URL-path grammar required by the HTTP specification.<br /> + Available in Apache HTTP Server 2.4.3 and later.</p> + + <div class="warning"> + <h3>Security Warning</h3> + + <p>Enabling this option will make the server vulnerable to + security issues if used with rewrite rules which are not + carefully authored. It is <strong>strongly recommended</strong> + that this option is not used. In particular, beware of input + strings containing the '<code>@</code>' character which could + change the interpretation of the transformed URI, as per the + above CVE names.</p> + </div> + </dd> + + <dt><code>MergeBase</code></dt> + <dd> + + <p>With this option, the value of <code class="directive"><a href="#rewritebase">RewriteBase</a></code> is copied from where it's explicitly defined + into any sub-directory or sub-location that doesn't define its own + <code class="directive"><a href="#rewritebase">RewriteBase</a></code>. This was the + default behavior in 2.4.0 through 2.4.3, and the flag to restore it is + available Apache HTTP Server 2.4.4 and later.</p> + </dd> + + <dt><code>IgnoreContextInfo</code></dt> + <dd> + + <p>When a relative substitution is made + in directory (htaccess) context and <code class="directive"><a href="#rewritebase">RewriteBase</a></code> has not been set, this module uses some + extended URL and filesystem context information to change the + relative substitution back into a URL. Modules such as + <code class="module"><a href="../mod/mod_userdir.html">mod_userdir</a></code> and <code class="module"><a href="../mod/mod_alias.html">mod_alias</a></code> + supply this extended context info. Available in 2.4.16 and later.</p> + </dd> + + + <dt><code>LegacyPrefixDocRoot</code></dt> + <dd> + + <p>Prior to 2.4.26, if a substitution was an absolute URL that matched + the current virtual host, the URL might first be reduced to a URL-path + and then later reduced to a local path. Since the URL can be reduced + to a local path, the path should be prefixed with the document root. + This prevents a file such as /tmp/myfile from being accessed when a + request is made to http://host/file/myfile with the following + <code class="directive"><a href="#rewriterule">RewriteRule</a></code>.</p> + <pre class="prettyprint lang-config">RewriteRule /file/(.*) http://localhost/tmp/$1</pre> + + <p>This option allows the old behavior to be used where the document + root is not prefixed to a local path that was reduced from a + URL. Available in 2.4.26 and later.</p> + </dd> + + </dl> + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="RewriteRule" id="RewriteRule">RewriteRule</a> <a name="rewriterule" id="rewriterule">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Defines rules for the rewriting engine</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>RewriteRule + <em>Pattern</em> <em>Substitution</em> [<em>flags</em>]</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, 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_rewrite</td></tr> +</table> + <p>The <code class="directive">RewriteRule</code> directive is the real + rewriting workhorse. The directive can occur more than once, + with each instance defining a single rewrite rule. The + order in which these rules are defined is important - this is the order + in which they will be applied at run-time.</p> + + <p><a id="patterns" name="patterns"><em>Pattern</em></a> is + a perl compatible <a id="regexp" name="regexp">regular + expression</a>. What this pattern is compared against varies depending + on where the <code class="directive">RewriteRule</code> directive is defined. </p> + +<div class="note"><h3><a id="what_is_matched" name="what_is_matched">What is matched?</a></h3> + +<ul> + <li><p>In <code class="directive"><a href="../mod/core.html#virtualhost">VirtualHost</a></code> context, + The <em>Pattern</em> will initially be matched against the part of the + URL after the hostname and port, and before the query string (e.g. "/app1/index.html"). + This is the (%-decoded) <a href="directive-dict.html#Syntax">URL-path</a>.</p></li> + + <li><p>In per-directory context (<code class="directive"><a href="../mod/core.html#directory">Directory</a></code> and .htaccess), + the <em>Pattern</em> is matched against only a partial path, for example a request + of "/app1/index.html" may result in comparison against "app1/index.html" + or "index.html" depending on where the <code class="directive">RewriteRule</code> is + defined.</p> + + <p>The directory path where the rule is defined is stripped from the currently mapped + filesystem path before comparison (up to and including a trailing slash). + The net result of this per-directory prefix stripping is that rules in + this context only match against the portion of the currently mapped filesystem path + "below" where the rule is defined.</p> + + <p>Directives such as <code class="directive"><a href="../mod/core.html#documentroot">DocumentRoot</a></code> and <code class="directive"><a href="../mod/mod_alias.html#alias">Alias</a></code>, or even the + result of previous <code class="directive">RewriteRule</code> substitutions, determine + the currently mapped filesystem path. + </p> + </li> + + <li><p>If you wish to match against the hostname, port, or query string, use a + <code class="directive"><a href="#rewritecond">RewriteCond</a></code> with the + <code>%{HTTP_HOST}</code>, <code>%{SERVER_PORT}</code>, or + <code>%{QUERY_STRING}</code> variables respectively.</p></li> +</ul> +</div> + +<div class="note"><h3>Per-directory Rewrites</h3> +<ul> +<li>The rewrite engine may be used in <a href="../howto/htaccess.html">.htaccess</a> files and in <code class="directive"><a href="../mod/core.html#directory"><Directory></a></code> sections, with some additional +complexity.</li> + +<li>To enable the rewrite engine in this context, you need to set +"<code>RewriteEngine On</code>" <strong>and</strong> +"<code>Options FollowSymLinks</code>" must be enabled. If your +administrator has disabled override of <code>FollowSymLinks</code> for +a user's directory, then you cannot use the rewrite engine. This +restriction is required for security reasons.</li> + +<li>See the <code class="directive"><a href="#rewritebase">RewriteBase</a></code> +directive for more information regarding what prefix will be added back to +relative substitutions.</li> + +<li> If you wish to match against the full URL-path in a per-directory +(htaccess) RewriteRule, use the <code>%{REQUEST_URI}</code> variable in +a <code class="directive"><a href="#rewritecond">RewriteCond</a></code>.</li> + +<li>The removed prefix always ends with a slash, meaning the matching occurs against a string which +<em>never</em> has a leading slash. Therefore, a <em>Pattern</em> with <code>^/</code> never +matches in per-directory context.</li> + +<li>Although rewrite rules are syntactically permitted in <code class="directive"><a href="../mod/core.html#location"><Location></a></code> and <code class="directive"><a href="../mod/core.html#files"><Files></a></code> sections +(including their regular expression counterparts), this +should never be necessary and is unsupported. A likely feature +to break in these contexts is relative substitutions.</li> +</ul> +</div> + + <p>For some hints on <a class="glossarylink" href="../glossary.html#regex" title="see glossary">regular + expressions</a>, see + the <a href="../rewrite/intro.html#regex">mod_rewrite + Introduction</a>.</p> + + <p>In <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code>, the NOT character + ('<code>!</code>') is also available as a possible pattern + prefix. This enables you to negate a pattern; to say, for instance: + ``<em>if the current URL does <strong>NOT</strong> match this + pattern</em>''. This can be used for exceptional cases, where + it is easier to match the negative pattern, or as a last + default rule.</p> + +<div class="note"><h3>Note</h3> +When using the NOT character to negate a pattern, you cannot include +grouped wildcard parts in that pattern. This is because, when the +pattern does NOT match (ie, the negation matches), there are no +contents for the groups. Thus, if negated patterns are used, you +cannot use <code>$N</code> in the substitution string! +</div> + + <p>The <a id="rhs" name="rhs"><em>Substitution</em></a> of a + rewrite rule is the string that replaces the original URL-path that + was matched by <em>Pattern</em>. The <em>Substitution</em> may + be a:</p> + + <dl> + + <dt>file-system path</dt> + + <dd>Designates the location on the file-system of the resource + to be delivered to the client. Substitutions are only + treated as a file-system path when the rule is configured in + server (virtualhost) context and the first component of the + path in the substitution exists in the file-system</dd> + + <dt>URL-path</dt> + + <dd>A <code class="directive"><a href="../mod/core.html#documentroot">DocumentRoot</a></code>-relative path to the + resource to be served. Note that <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> + tries to guess whether you have specified a file-system path + or a URL-path by checking to see if the first segment of the + path exists at the root of the file-system. For example, if + you specify a <em>Substitution</em> string of + <code>/www/file.html</code>, then this will be treated as a + URL-path <em>unless</em> a directory named <code>www</code> + exists at the root or your file-system (or, in the case of + using rewrites in a <code>.htaccess</code> file, relative to + your document root), in which case it will + be treated as a file-system path. If you wish other + URL-mapping directives (such as <code class="directive"><a href="../mod/mod_alias.html#alias">Alias</a></code>) to be applied to the + resulting URL-path, use the <code>[PT]</code> flag as + described below.</dd> + + <dt>Absolute URL</dt> + + <dd>If an absolute URL is specified, + <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> checks to see whether the + hostname matches the current host. If it does, the scheme and + hostname are stripped out and the resulting path is treated as + a URL-path. Otherwise, an external redirect is performed for + the given URL. To force an external redirect back to the + current host, see the <code>[R]</code> flag below.</dd> + + <dt><code>-</code> (dash)</dt> + + <dd>A dash indicates that no substitution should be performed + (the existing path is passed through untouched). This is used + when a flag (see below) needs to be applied without changing + the path.</dd> + + </dl> + + <p>In addition to plain text, the <em>Substitution</em> string can include</p> + + <ol> + <li>back-references (<code>$N</code>) to the RewriteRule + pattern</li> + + <li>back-references (<code>%N</code>) to the last matched + RewriteCond pattern</li> + + <li>server-variables as in rule condition test-strings + (<code>%{VARNAME}</code>)</li> + + <li><a href="#mapfunc">mapping-function</a> calls + (<code>${mapname:key|default}</code>)</li> + </ol> + + <p>Back-references are identifiers of the form + <code>$</code><strong>N</strong> + (<strong>N</strong>=0..9), which will be replaced + by the contents of the <strong>N</strong>th group of the + matched <em>Pattern</em>. The server-variables are the same + as for the <em>TestString</em> of a + <code class="directive"><a href="#rewritecond">RewriteCond</a></code> + directive. The mapping-functions come from the + <code class="directive"><a href="#rewritemap">RewriteMap</a></code> + directive and are explained there. + These three types of variables are expanded in the order above.</p> + + <p>Rewrite rules are applied to the results of previous rewrite + rules, in the order in which they are defined + in the config file. The URL-path or file-system path (see <a href="#what_is_matched">"What is matched?"</a>, above) is <strong>completely + replaced</strong> by the <em>Substitution</em> and the + rewriting process continues until all rules have been applied, + or it is explicitly terminated by an + <a href="../rewrite/flags.html#flag_l"><code><strong>L</strong></code> flag</a>, + or other flag which implies immediate termination, such as + <code><strong>END</strong></code> or + <code><strong>F</strong></code>.</p> + + <div class="note"><h3>Modifying the Query String</h3> + <p>By default, the query string is passed through unchanged. You + can, however, create URLs in the substitution string containing + a query string part. Simply use a question mark inside the + substitution string to indicate that the following text should + be re-injected into the query string. When you want to erase an + existing query string, end the substitution string with just a + question mark. To combine new and old query strings, use the + <code>[QSA]</code> flag.</p> + </div> + + <p>Additionally you can set special <a name="rewriteflags" id="rewriteflags">actions</a> to be performed by + appending <strong><code>[</code><em>flags</em><code>]</code></strong> + as the third argument to the <code class="directive">RewriteRule</code> + directive. <em>Flags</em> is a comma-separated list, surround by square + brackets, of any of the flags in the following table. More + details, and examples, for each flag, are available in the <a href="../rewrite/flags.html">Rewrite Flags document</a>.</p> + + <table class="bordered"><tr class="header"><th>Flag and syntax</th> + <th>Function</th> + </tr> +<tr> + <td>B</td> + <td>Escape non-alphanumeric characters in backreferences <em>before</em> + applying the transformation. <em><a href="../rewrite/flags.html#flag_b">details ...</a></em></td> + </tr> +<tr class="odd"> + <td>backrefnoplus|BNP</td> + <td>If backreferences are being escaped, spaces should be escaped to + %20 instead of +. Useful when the backreference will be used in the + path component rather than the query string.<em><a href="../rewrite/flags.html#flag_bnp">details ...</a></em></td> + </tr> +<tr> + <td>chain|C</td> + <td>Rule is chained to the following rule. If the rule fails, + the rule(s) chained to it will be skipped. <em><a href="../rewrite/flags.html#flag_c">details ...</a></em></td> + </tr> +<tr class="odd"> + <td>cookie|CO=<em>NAME</em>:<em>VAL</em></td> + <td>Sets a cookie in the client browser. Full syntax is: + CO=<em>NAME</em>:<em>VAL</em>:<em>domain</em>[:<em>lifetime</em>[:<em>path</em>[:<em>secure</em>[:<em>httponly</em>]]]] <em><a href="../rewrite/flags.html#flag_co">details ...</a></em> + </td> + </tr> +<tr> + <td>discardpath|DPI</td> + <td>Causes the PATH_INFO portion of the rewritten URI to be + discarded. <em><a href="../rewrite/flags.html#flag_dpi">details + ...</a></em></td> + </tr> +<tr class="odd"> + <td>END</td> + <td>Stop the rewriting process immediately and don't apply any + more rules. Also prevents further execution of rewrite rules + in per-directory and .htaccess context. (Available in 2.3.9 and later) + <em><a href="../rewrite/flags.html#flag_end">details ...</a></em></td> + </tr> +<tr> + <td>env|E=[!]<em>VAR</em>[:<em>VAL</em>]</td> + <td>Causes an environment variable <em>VAR</em> to be set (to the + value <em>VAL</em> if provided). The form !<em>VAR</em> causes + the environment variable <em>VAR</em> to be unset. + <em><a href="../rewrite/flags.html#flag_e">details ...</a></em></td> + </tr> +<tr class="odd"> + <td>forbidden|F</td> + <td>Returns a 403 FORBIDDEN response to the client browser. + <em><a href="../rewrite/flags.html#flag_f">details ...</a></em></td> + </tr> +<tr> + <td>gone|G</td> + <td>Returns a 410 GONE response to the client browser. <em><a href="../rewrite/flags.html#flag_g">details ...</a></em></td> + </tr> +<tr class="odd"> + <td>Handler|H=<em>Content-handler</em></td> + <td>Causes the resulting URI to be sent to the specified + <em>Content-handler</em> for processing. <em><a href="../rewrite/flags.html#flag_h">details ...</a></em></td> + </tr> +<tr> + <td>last|L</td> + <td>Stop the rewriting process immediately and don't apply any + more rules. Especially note caveats for per-directory and + .htaccess context (see also the END flag). <em><a href="../rewrite/flags.html#flag_l">details ...</a></em></td> + </tr> +<tr class="odd"> + <td>next|N</td> + <td>Re-run the rewriting process, starting again with the first + rule, using the result of the ruleset so far as a starting + point. <em><a href="../rewrite/flags.html#flag_n">details + ...</a></em></td> + </tr> +<tr> + <td>nocase|NC</td> + <td>Makes the pattern comparison case-insensitive. + <em><a href="../rewrite/flags.html#flag_nc">details ...</a></em></td> + </tr> +<tr class="odd"> + <td>noescape|NE</td> + <td>Prevent mod_rewrite from applying hexcode escaping of + special characters in the result of the rewrite. <em><a href="../rewrite/flags.html#flag_ne">details ...</a></em></td> + </tr> +<tr> + <td>nosubreq|NS</td> + <td>Causes a rule to be skipped if the current request is an + internal sub-request. <em><a href="../rewrite/flags.html#flag_ns">details ...</a></em></td> + </tr> +<tr class="odd"> + <td>proxy|P</td> + <td>Force the substitution URL to be internally sent as a proxy + request. <em><a href="../rewrite/flags.html#flag_p">details + ...</a></em></td> + </tr> +<tr> + <td>passthrough|PT</td> + <td>Forces the resulting URI to be passed back to the URL + mapping engine for processing of other URI-to-filename + translators, such as <code>Alias</code> or + <code>Redirect</code>. <em><a href="../rewrite/flags.html#flag_pt">details ...</a></em></td> + </tr> +<tr class="odd"> + <td>qsappend|QSA</td> + <td>Appends any query string from the original request URL to + any query string created in the rewrite target.<em><a href="../rewrite/flags.html#flag_qsa">details ...</a></em></td> + </tr> +<tr> + <td>qsdiscard|QSD</td> + <td>Discard any query string attached to the incoming URI. + <em><a href="../rewrite/flags.html#flag_qsd">details + ...</a></em></td> + </tr> +<tr class="odd"> + <td>qslast|QSL</td> + <td>Interpret the last (right-most) question mark as the query string + delimiter, instead of the first (left-most) as normally used. + Available in 2.4.19 and later. + <em><a href="../rewrite/flags.html#flag_qsl">details + ...</a></em></td> + </tr> +<tr> + <td>redirect|R[=<em>code</em>]</td> + <td>Forces an external redirect, optionally with the specified + HTTP status code. <em><a href="../rewrite/flags.html#flag_r">details ...</a></em> + </td> + </tr> +<tr class="odd"> + <td>skip|S=<em>num</em></td> + <td>Tells the rewriting engine to skip the next <em>num</em> + rules if the current rule matches. <em><a href="../rewrite/flags.html#flag_s">details ...</a></em></td> + </tr> +<tr> + <td>type|T=<em>MIME-type</em></td> + <td>Force the <a class="glossarylink" href="../glossary.html#mime-type" title="see glossary">MIME-type</a> of the target file + to be the specified type. <em><a href="../rewrite/flags.html#flag_t">details ...</a></em></td> + </tr> +</table> + +<div class="note"><h3>Home directory expansion</h3> +<p> When the substitution string begins with a string +resembling "/~user" (via explicit text or backreferences), <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> performs +home directory expansion independent of the presence or configuration +of <code class="module"><a href="../mod/mod_userdir.html">mod_userdir</a></code>.</p> + +<p> This expansion does not occur when the <em>PT</em> +flag is used on the <code class="directive"><a href="#rewriterule">RewriteRule</a></code> +directive.</p> +</div> + + + <p>Here are all possible substitution combinations and their + meanings:</p> + + <p><strong>Inside per-server configuration + (<code>httpd.conf</code>)<br /> + for request ``<code>GET + /somepath/pathinfo</code>'':</strong><br /> + </p> + +<table class="bordered"><tr class="header"> +<th>Given Rule</th> +<th>Resulting Substitution</th> +</tr> +<tr> +<td>^/somepath(.*) otherpath$1</td> +<td>invalid, not supported</td> +</tr> +<tr class="odd"> +<td>^/somepath(.*) otherpath$1 [R]</td> +<td>invalid, not supported</td> +</tr> +<tr> +<td>^/somepath(.*) otherpath$1 [P]</td> +<td>invalid, not supported</td> +</tr> +<tr class="odd"> +<td>^/somepath(.*) /otherpath$1</td> +<td>/otherpath/pathinfo</td> +</tr> +<tr> +<td>^/somepath(.*) /otherpath$1 [R]</td> +<td>http://thishost/otherpath/pathinfo via external redirection</td> +</tr> +<tr class="odd"> +<td>^/somepath(.*) /otherpath$1 [P]</td> +<td>doesn't make sense, not supported</td> +</tr> +<tr> +<td>^/somepath(.*) http://thishost/otherpath$1</td> +<td>/otherpath/pathinfo</td> +</tr> +<tr class="odd"> +<td>^/somepath(.*) http://thishost/otherpath$1 [R]</td> +<td>http://thishost/otherpath/pathinfo via external redirection</td> +</tr> +<tr> +<td>^/somepath(.*) http://thishost/otherpath$1 [P]</td> +<td>doesn't make sense, not supported</td> +</tr> +<tr class="odd"> +<td>^/somepath(.*) http://otherhost/otherpath$1</td> +<td>http://otherhost/otherpath/pathinfo via external redirection</td> +</tr> +<tr> +<td>^/somepath(.*) http://otherhost/otherpath$1 [R]</td> +<td>http://otherhost/otherpath/pathinfo via external redirection (the [R] flag is redundant)</td> +</tr> +<tr class="odd"> +<td>^/somepath(.*) http://otherhost/otherpath$1 [P]</td> +<td>http://otherhost/otherpath/pathinfo via internal proxy</td> +</tr> +</table> + + <p><strong>Inside per-directory configuration for + <code>/somepath</code><br /> + (<code>/physical/path/to/somepath/.htaccess</code>, with + <code>RewriteBase "/somepath"</code>)<br /> + for request ``<code>GET + /somepath/localpath/pathinfo</code>'':</strong><br /> + </p> + +<table class="bordered"><tr class="header"> +<th>Given Rule</th> +<th>Resulting Substitution</th> +</tr> +<tr> +<td>^localpath(.*) otherpath$1</td> +<td>/somepath/otherpath/pathinfo</td> +</tr> +<tr class="odd"> +<td>^localpath(.*) otherpath$1 [R]</td> +<td>http://thishost/somepath/otherpath/pathinfo via external +redirection</td> +</tr> +<tr> +<td>^localpath(.*) otherpath$1 [P]</td> +<td>doesn't make sense, not supported</td> +</tr> +<tr class="odd"> +<td>^localpath(.*) /otherpath$1</td> +<td>/otherpath/pathinfo</td> +</tr> +<tr> +<td>^localpath(.*) /otherpath$1 [R]</td> +<td>http://thishost/otherpath/pathinfo via external redirection</td> +</tr> +<tr class="odd"> +<td>^localpath(.*) /otherpath$1 [P]</td> +<td>doesn't make sense, not supported</td> +</tr> +<tr> +<td>^localpath(.*) http://thishost/otherpath$1</td> +<td>/otherpath/pathinfo</td> +</tr> +<tr class="odd"> +<td>^localpath(.*) http://thishost/otherpath$1 [R]</td> +<td>http://thishost/otherpath/pathinfo via external redirection</td> +</tr> +<tr> +<td>^localpath(.*) http://thishost/otherpath$1 [P]</td> +<td>doesn't make sense, not supported</td> +</tr> +<tr class="odd"> +<td>^localpath(.*) http://otherhost/otherpath$1</td> +<td>http://otherhost/otherpath/pathinfo via external redirection</td> +</tr> +<tr> +<td>^localpath(.*) http://otherhost/otherpath$1 [R]</td> +<td>http://otherhost/otherpath/pathinfo via external redirection (the [R] flag is redundant)</td> +</tr> +<tr class="odd"> +<td>^localpath(.*) http://otherhost/otherpath$1 [P]</td> +<td>http://otherhost/otherpath/pathinfo via internal proxy</td> +</tr> +</table> + + +</div> +</div> +<div class="bottomlang"> +<p><span>Available Languages: </span><a href="../en/mod/mod_rewrite.html" title="English"> en </a> | +<a href="../fr/mod/mod_rewrite.html" hreflang="fr" rel="alternate" title="Français"> fr </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&A section. 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