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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-07 02:04:06 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-07 02:04:06 +0000
commit5dff2d61cc1c27747ee398e04d8e02843aabb1f8 (patch)
treea67c336b406c8227bac912beb74a1ad3cdc55100 /docs/manual/rewrite/flags.html.en
parentInitial commit. (diff)
downloadapache2-upstream.tar.xz
apache2-upstream.zip
Adding upstream version 2.4.38.upstream/2.4.38upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+<?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>RewriteRule Flags - 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 id="manual-page"><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="./">Rewrite</a></div><div id="page-content"><div id="preamble"><h1>RewriteRule Flags</h1>
+<div class="toplang">
+<p><span>Available Languages: </span><a href="../en/rewrite/flags.html" title="English">&nbsp;en&nbsp;</a> |
+<a href="../fr/rewrite/flags.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a></p>
+</div>
+
+<p>This document discusses the flags which are available to the
+<code class="directive"><a href="../mod/mod_rewrite.html#rewriterule">RewriteRule</a></code> directive,
+providing detailed explanations and examples.</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><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#introduction">Introduction</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#flag_b">B (escape backreferences)</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#flag_bnp">BNP|backrefnoplus (don't escape space to +)</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#flag_c">C|chain</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#flag_co">CO|cookie</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#flag_dpi">DPI|discardpath</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#flag_e">E|env</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#flag_end">END</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#flag_f">F|forbidden</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#flag_g">G|gone</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#flag_h">H|handler</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#flag_l">L|last</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#flag_n">N|next</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#flag_nc">NC|nocase</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#flag_ne">NE|noescape</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#flag_ns">NS|nosubreq</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#flag_p">P|proxy</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#flag_pt">PT|passthrough</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#flag_qsa">QSA|qsappend</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#flag_qsd">QSD|qsdiscard</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#flag_qsl">QSL|qslast</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#flag_r">R|redirect</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#flag_s">S|skip</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#flag_t">T|type</a></li>
+</ul><h3>See also</h3><ul class="seealso"><li><a href="../mod/mod_rewrite.html">Module documentation</a></li><li><a href="intro.html">mod_rewrite introduction</a></li><li><a href="remapping.html">Redirection and remapping</a></li><li><a href="access.html">Controlling access</a></li><li><a href="vhosts.html">Virtual hosts</a></li><li><a href="proxy.html">Proxying</a></li><li><a href="rewritemap.html">Using RewriteMap</a></li><li><a href="advanced.html">Advanced techniques</a></li><li><a href="avoid.html">When not to use mod_rewrite</a></li><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="introduction" id="introduction">Introduction</a></h2>
+<p>A <code class="directive"><a href="../mod/mod_rewrite.html#rewriterule">RewriteRule</a></code> can have
+its behavior modified by one or more flags. Flags are included in
+square brackets at the end of the rule, and multiple flags are separated
+by commas.</p>
+<pre class="prettyprint lang-config">RewriteRule pattern target [Flag1,Flag2,Flag3]</pre>
+
+
+<p>Each flag (with a few exceptions) has a short form, such as
+<code>CO</code>, as well as a longer form, such as <code>cookie</code>.
+While it is most common to use
+the short form, it is recommended that you familiarize yourself with the
+long form, so that you remember what each flag is supposed to do.
+Some flags take one or more arguments. Flags are not case sensitive.</p>
+
+<p>Flags that alter metadata associated with the request (T=, H=, E=)
+have no affect in per-directory and htaccess context, when a substitution
+(other than '-') is performed during the same round of rewrite processing.
+</p>
+
+<p>Presented here are each of the available flags, along with an example
+of how you might use them.</p>
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="flag_b" id="flag_b">B (escape backreferences)</a></h2>
+<p>The [B] flag instructs <code class="directive"><a href="../mod/mod_rewrite.html#rewriterule">RewriteRule</a></code> to escape non-alphanumeric
+characters before applying the transformation.</p>
+<p>In 2.4.26 and later, you can limit the escaping to specific characters
+in backreferences by listing them: <code>[B=#?;]</code>. Note: The space
+character can be used in the list of characters to escape, but it cannot be
+the last character in the list.</p>
+
+<p><code>mod_rewrite</code> has to unescape URLs before mapping them,
+so backreferences are unescaped at the time they are applied.
+Using the B flag, non-alphanumeric characters in backreferences
+will be escaped. For example, consider the rule:</p>
+
+<pre class="prettyprint lang-config">RewriteRule "^search/(.*)$" "/search.php?term=$1"</pre>
+
+
+<p>Given a search term of 'x &amp; y/z', a browser will encode it as
+'x%20%26%20y%2Fz', making the request 'search/x%20%26%20y%2Fz'. Without the B
+flag, this rewrite rule will map to 'search.php?term=x &amp; y/z', which
+isn't a valid URL, and so would be encoded as
+<code>search.php?term=x%20&amp;y%2Fz=</code>, which is not what was intended.</p>
+
+<p>With the B flag set on this same rule, the parameters are re-encoded
+before being passed on to the output URL, resulting in a correct mapping to
+<code>/search.php?term=x%20%26%20y%2Fz</code>.</p>
+
+<pre class="prettyprint lang-config">RewriteRule "^search/(.*)$" "/search.php?term=$1" [B,PT]</pre>
+
+
+<p>Note that you may also need to set <code class="directive"><a href="../mod/core.html#allowencodedslashes">AllowEncodedSlashes</a></code> to <code>On</code> to get this
+particular example to work, as httpd does not allow encoded slashes in URLs, and
+returns a 404 if it sees one.</p>
+
+<p>This escaping is particularly necessary in a proxy situation,
+when the backend may break if presented with an unescaped URL.</p>
+
+<p>An alternative to this flag is using a <code class="directive"><a href="../mod/mod_rewrite.html#rewritecond">RewriteCond</a></code> to capture against %{THE_REQUEST} which will capture
+strings in the encoded form.</p>
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="flag_bnp" id="flag_bnp">BNP|backrefnoplus (don't escape space to +)</a></h2>
+<p>The [BNP] flag instructs <code class="directive"><a href="../mod/mod_rewrite.html#rewriterule">RewriteRule</a></code> to escape the space character
+in a backreference to %20 rather than '+'. Useful when the backreference
+will be used in the path component rather than the query string.</p>
+
+<p>This flag is available in version 2.4.26 and later.</p>
+
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="flag_c" id="flag_c">C|chain</a></h2>
+<p>The [C] or [chain] flag indicates that the <code class="directive"><a href="../mod/mod_rewrite.html#rewriterule">RewriteRule</a></code> is chained to the next
+rule. That is, if the rule matches, then it is processed as usual and
+control moves on to the next rule. However, if it does not match, then
+the next rule, and any other rules that are chained together, are
+skipped.</p>
+
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="flag_co" id="flag_co">CO|cookie</a></h2>
+<p>The [CO], or [cookie] flag, allows you to set a cookie when a
+particular <code class="directive"><a href="../mod/mod_rewrite.html#rewriterule">RewriteRule</a></code>
+matches. The argument consists of three required fields and four optional
+fields.</p>
+
+<p>The full syntax for the flag, including all attributes, is as
+follows:</p>
+
+<div class="example"><p><code>
+[CO=NAME:VALUE:DOMAIN:lifetime:path:secure:httponly]
+</code></p></div>
+
+<p>If a literal ':' character is needed in any of the cookie fields, an
+alternate syntax is available. To opt-in to the alternate syntax, the cookie
+"Name" should be preceded with a ';' character, and field separators should be
+specified as ';'.</p>
+
+<div class="example"><p><code>
+[CO=;NAME;VALUE:MOREVALUE;DOMAIN;lifetime;path;secure;httponly]
+</code></p></div>
+
+<p>You must declare a name, a value, and a domain for the cookie to be set.</p>
+
+<dl>
+<dt>Domain</dt>
+<dd>The domain for which you want the cookie to be valid. This may be a
+hostname, such as <code>www.example.com</code>, or it may be a domain,
+such as <code>.example.com</code>. It must be at least two parts
+separated by a dot. That is, it may not be merely <code>.com</code> or
+<code>.net</code>. Cookies of that kind are forbidden by the cookie
+security model.</dd>
+</dl>
+
+<p>You may optionally also set the following values:</p>
+
+<dl>
+<dt>Lifetime</dt>
+<dd>The time for which the cookie will persist, in minutes.</dd>
+<dd>A value of 0 indicates that the cookie will persist only for the
+current browser session. This is the default value if none is
+specified.</dd>
+
+<dt>Path</dt>
+<dd>The path, on the current website, for which the cookie is valid,
+such as <code>/customers/</code> or <code>/files/download/</code>.</dd>
+<dd>By default, this is set to <code>/</code> - that is, the entire
+website.</dd>
+
+<dt>Secure</dt>
+<dd>If set to <code>secure</code>, <code>true</code>, or <code>1</code>,
+the cookie will only be permitted to be translated via secure (https)
+connections.</dd>
+
+<dt>httponly</dt>
+<dd>If set to <code>HttpOnly</code>, <code>true</code>, or
+<code>1</code>, the cookie will have the <code>HttpOnly</code> flag set,
+which means that the cookie is inaccessible to JavaScript code on
+browsers that support this feature.</dd>
+</dl>
+
+<p>Consider this example:</p>
+
+<pre class="prettyprint lang-config">RewriteEngine On
+RewriteRule "^/index\.html" "-" [CO=frontdoor:yes:.example.com:1440:/]</pre>
+
+
+<p>In the example give, the rule doesn't rewrite the request.
+The "-" rewrite target tells mod_rewrite to pass the request
+through unchanged. Instead, it sets a cookie
+called 'frontdoor' to a value of 'yes'. The cookie is valid for any host
+in the <code>.example.com</code> domain. It is set to expire in 1440
+minutes (24 hours) and is returned for all URIs.</p>
+
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="flag_dpi" id="flag_dpi">DPI|discardpath</a></h2>
+<p>The DPI flag causes the PATH_INFO portion of the rewritten URI to be
+discarded.</p>
+<p>This flag is available in version 2.2.12 and later.</p>
+<p>In per-directory context, the URI each <code class="directive">RewriteRule</code>
+compares against is the concatenation of the current values of the URI
+and PATH_INFO.</p>
+
+<p>The current URI can be the initial URI as requested by the client, the
+result of a previous round of mod_rewrite processing, or the result of
+a prior rule in the current round of mod_rewrite processing.</p>
+
+<p>In contrast, the PATH_INFO that is appended to the URI before each
+rule reflects only the value of PATH_INFO before this round of
+mod_rewrite processing. As a consequence, if large portions
+of the URI are matched and copied into a substitution in multiple
+<code class="directive">RewriteRule</code> directives, without regard for
+which parts of the URI came from the current PATH_INFO, the final
+URI may have multiple copies of PATH_INFO appended to it.</p>
+
+<p>Use this flag on any substitution where the PATH_INFO that resulted
+from the previous mapping of this request to the filesystem is not of
+interest. This flag permanently forgets the PATH_INFO established
+before this round of mod_rewrite processing began. PATH_INFO will
+not be recalculated until the current round of mod_rewrite processing
+completes. Subsequent rules during this round of processing will see
+only the direct result of substitutions, without any PATH_INFO
+appended.</p>
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="flag_e" id="flag_e">E|env</a></h2>
+<p>With the [E], or [env] flag, you can set the value of an environment
+variable. Note that some environment variables may be set after the rule
+is run, thus unsetting what you have set. See <a href="../env.html">the
+Environment Variables document</a> for more details on how Environment
+variables work.</p>
+
+<p>The full syntax for this flag is:</p>
+
+<pre class="prettyprint lang-config">[E=VAR:VAL]
+[E=!VAR]</pre>
+
+
+<p><code>VAL</code> may contain backreferences (<code>$N</code> or
+<code>%N</code>) which are expanded.</p>
+
+<p>Using the short form</p>
+
+<div class="example"><p><code>
+[E=VAR]
+</code></p></div>
+
+<p>you can set the environment variable named <code>VAR</code> to an
+empty value.</p>
+
+<p>The form</p>
+
+<div class="example"><p><code>
+[E=!VAR]
+</code></p></div>
+
+<p>allows to unset a previously set environment variable named
+<code>VAR</code>.</p>
+
+<p>Environment variables can then be used in a variety of
+contexts, including CGI programs, other RewriteRule directives, or
+CustomLog directives.</p>
+
+<p>The following example sets an environment variable called 'image' to a
+value of '1' if the requested URI is an image file. Then, that
+environment variable is used to exclude those requests from the access
+log.</p>
+
+<pre class="prettyprint lang-config">RewriteRule "\.(png|gif|jpg)$" "-" [E=image:1]
+CustomLog "logs/access_log" combined env=!image</pre>
+
+
+<p>Note that this same effect can be obtained using <code class="directive"><a href="../mod/mod_setenvif.html#setenvif">SetEnvIf</a></code>. This technique is offered as
+an example, not as a recommendation.</p>
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="flag_end" id="flag_end">END</a></h2>
+<p>Using the [END] flag terminates not only the current round of rewrite
+processing (like [L]) but also prevents any subsequent rewrite
+processing from occurring in per-directory (htaccess) context.</p>
+
+<p>This does not apply to new requests resulting from external
+redirects.</p>
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="flag_f" id="flag_f">F|forbidden</a></h2>
+<p>Using the [F] flag causes the server to return a 403 Forbidden status
+code to the client. While the same behavior can be accomplished using
+the <code class="directive"><a href="../mod/mod_access_compat.html#deny">Deny</a></code> directive, this
+allows more flexibility in assigning a Forbidden status.</p>
+
+<p>The following rule will forbid <code>.exe</code> files from being
+downloaded from your server.</p>
+
+<pre class="prettyprint lang-config">RewriteRule "\.exe" "-" [F]</pre>
+
+
+<p>This example uses the "-" syntax for the rewrite target, which means
+that the requested URI is not modified. There's no reason to rewrite to
+another URI, if you're going to forbid the request.</p>
+
+<p>When using [F], an [L] is implied - that is, the response is returned
+immediately, and no further rules are evaluated.</p>
+
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="flag_g" id="flag_g">G|gone</a></h2>
+<p>The [G] flag forces the server to return a 410 Gone status with the
+response. This indicates that a resource used to be available, but is no
+longer available.</p>
+
+<p>As with the [F] flag, you will typically use the "-" syntax for the
+rewrite target when using the [G] flag:</p>
+
+<pre class="prettyprint lang-config">RewriteRule "oldproduct" "-" [G,NC]</pre>
+
+
+<p>When using [G], an [L] is implied - that is, the response is returned
+immediately, and no further rules are evaluated.</p>
+
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="flag_h" id="flag_h">H|handler</a></h2>
+<p>Forces the resulting request to be handled with the specified
+handler. For example, one might use this to force all files without a
+file extension to be parsed by the php handler:</p>
+
+<pre class="prettyprint lang-config">RewriteRule "!\." "-" [H=application/x-httpd-php]</pre>
+
+
+<p>
+The regular expression above - <code>!\.</code> - will match any request
+that does not contain the literal <code>.</code> character.
+</p>
+
+<p>This can be also used to force the handler based on some conditions.
+For example, the following snippet used in per-server context allows
+<code>.php</code> files to be <em>displayed</em> by <code>mod_php</code>
+if they are requested with the <code>.phps</code> extension:</p>
+
+<pre class="prettyprint lang-config">RewriteRule "^(/source/.+\.php)s$" "$1" [H=application/x-httpd-php-source]</pre>
+
+
+<p>The regular expression above - <code>^(/source/.+\.php)s$</code> - will
+match any request that starts with <code>/source/</code> followed by 1 or
+n characters followed by <code>.phps</code> literally. The backreference
+$1 referrers to the captured match within parenthesis of the regular
+expression.</p>
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="flag_l" id="flag_l">L|last</a></h2>
+<p>The [L] flag causes <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> to stop processing
+the rule set. In most contexts, this means that if the rule matches, no
+further rules will be processed. This corresponds to the
+<code>last</code> command in Perl, or the <code>break</code> command in
+C. Use this flag to indicate that the current rule should be applied
+immediately without considering further rules.</p>
+
+<p>If you are using <code class="directive"><a href="../mod/mod_rewrite.html#rewriterule">RewriteRule</a></code> in either
+<code>.htaccess</code> files or in
+<code class="directive"><a href="../mod/core.html#directory">&lt;Directory&gt;</a></code> sections,
+it is important to have some understanding of how the rules are
+processed. The simplified form of this is that once the rules have been
+processed, the rewritten request is handed back to the URL parsing
+engine to do what it may with it. It is possible that as the rewritten
+request is handled, the <code>.htaccess</code> file or
+<code class="directive"><a href="../mod/core.html#directory">&lt;Directory&gt;</a></code> section
+may be encountered again, and thus the ruleset may be run again from the
+start. Most commonly this will happen if one of the rules causes a
+redirect - either internal or external - causing the request process to
+start over.</p>
+
+<p>It is therefore important, if you are using <code class="directive"><a href="../mod/mod_rewrite.html#rewriterule">RewriteRule</a></code> directives in one of these
+contexts, that you take explicit steps to avoid rules looping, and not
+count solely on the [L] flag to terminate execution of a series of
+rules, as shown below.</p>
+
+<p> An alternative flag, [END], can be used to terminate not only the
+current round of rewrite processing but prevent any subsequent
+rewrite processing from occurring in per-directory (htaccess)
+context. This does not apply to new requests resulting from external
+redirects.</p>
+
+<p>The example given here will rewrite any request to
+<code>index.php</code>, giving the original request as a query string
+argument to <code>index.php</code>, however, the <code class="directive"><a href="../mod/mod_rewrite.html#rewritecond">RewriteCond</a></code> ensures that if the request
+is already for <code>index.php</code>, the <code class="directive"><a href="../mod/mod_rewrite.html#rewriterule">RewriteRule</a></code> will be skipped.</p>
+
+<pre class="prettyprint lang-config">RewriteBase "/"
+RewriteCond "%{REQUEST_URI}" "!=/index.php"
+RewriteRule "^(.*)" "/index.php?req=$1" [L,PT]</pre>
+
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="flag_n" id="flag_n">N|next</a></h2>
+<p>
+The [N] flag causes the ruleset to start over again from the top, using
+the result of the ruleset so far as a starting point. Use
+with extreme caution, as it may result in loop.
+</p>
+<p>
+The [Next] flag could be used, for example, if you wished to replace a
+certain string or letter repeatedly in a request. The example shown here
+will replace A with B everywhere in a request, and will continue doing
+so until there are no more As to be replaced.
+</p>
+<pre class="prettyprint lang-config">RewriteRule "(.*)A(.*)" "$1B$2" [N]</pre>
+
+<p>You can think of this as a <code>while</code> loop: While this
+pattern still matches (i.e., while the URI still contains an
+<code>A</code>), perform this substitution (i.e., replace the
+<code>A</code> with a <code>B</code>).</p>
+
+<p>In 2.4.8 and later, this module returns an error after 32,000 iterations to
+protect against unintended looping. An alternative maximum number of
+iterations can be specified by adding to the N flag. </p>
+<pre class="prettyprint lang-config"># Be willing to replace 1 character in each pass of the loop
+RewriteRule "(.+)[&gt;&lt;;]$" "$1" [N=64000]
+# ... or, give up if after 10 loops
+RewriteRule "(.+)[&gt;&lt;;]$" "$1" [N=10]</pre>
+
+
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="flag_nc" id="flag_nc">NC|nocase</a></h2>
+<p>Use of the [NC] flag causes the <code class="directive"><a href="../mod/mod_rewrite.html#rewriterule">RewriteRule</a></code> to be matched in a
+case-insensitive manner. That is, it doesn't care whether letters appear
+as upper-case or lower-case in the matched URI.</p>
+
+<p>In the example below, any request for an image file will be proxied
+to your dedicated image server. The match is case-insensitive, so that
+<code>.jpg</code> and <code>.JPG</code> files are both acceptable, for
+example.</p>
+
+<pre class="prettyprint lang-config">RewriteRule "(.*\.(jpg|gif|png))$" "http://images.example.com$1" [P,NC]</pre>
+
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="flag_ne" id="flag_ne">NE|noescape</a></h2>
+<p>By default, special characters, such as <code>&amp;</code> and
+<code>?</code>, for example, will be converted to their hexcode
+equivalent. Using the [NE] flag prevents that from happening.
+</p>
+
+<pre class="prettyprint lang-config">RewriteRule "^/anchor/(.+)" "/bigpage.html#$1" [NE,R]</pre>
+
+
+<p>
+The above example will redirect <code>/anchor/xyz</code> to
+<code>/bigpage.html#xyz</code>. Omitting the [NE] will result in the #
+being converted to its hexcode equivalent, <code>%23</code>, which will
+then result in a 404 Not Found error condition.
+</p>
+
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="flag_ns" id="flag_ns">NS|nosubreq</a></h2>
+<p>Use of the [NS] flag prevents the rule from being used on
+subrequests. For example, a page which is included using an SSI (Server
+Side Include) is a subrequest, and you may want to avoid rewrites
+happening on those subrequests. Also, when <code class="module"><a href="../mod/mod_dir.html">mod_dir</a></code>
+tries to find out information about possible directory default files
+(such as <code>index.html</code> files), this is an internal
+subrequest, and you often want to avoid rewrites on such subrequests.
+On subrequests, it is not always useful, and can even cause errors, if
+the complete set of rules are applied. Use this flag to exclude
+problematic rules.</p>
+
+<p>To decide whether or not to use this rule: if you prefix URLs with
+CGI-scripts, to force them to be processed by the CGI-script, it's
+likely that you will run into problems (or significant overhead)
+on sub-requests. In these cases, use this flag.</p>
+
+<p>
+Images, javascript files, or css files, loaded as part of an HTML page,
+are not subrequests - the browser requests them as separate HTTP
+requests.
+</p>
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="flag_p" id="flag_p">P|proxy</a></h2>
+<p>Use of the [P] flag causes the request to be handled by
+<code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code>, and handled via a proxy request. For
+example, if you wanted all image requests to be handled by a back-end
+image server, you might do something like the following:</p>
+
+<pre class="prettyprint lang-config">RewriteRule "/(.*)\.(jpg|gif|png)$" "http://images.example.com/$1.$2" [P]</pre>
+
+
+<p>Use of the [P] flag implies [L] - that is, the request is immediately
+pushed through the proxy, and any following rules will not be
+considered.</p>
+
+<p>
+You must make sure that the substitution string is a valid URI
+(typically starting with <code>http://</code><em>hostname</em>) which can be
+handled by the <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code>. If not, you will get an
+error from the proxy module. Use this flag to achieve a
+more powerful implementation of the <code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code> directive,
+to map remote content into the namespace of the local server.</p>
+
+<div class="warning">
+<h3>Security Warning</h3>
+<p>Take care when constructing the target URL of the rule, considering
+the security impact from allowing the client influence over the set of
+URLs to which your server will act as a proxy. Ensure that the scheme
+and hostname part of the URL is either fixed, or does not allow the
+client undue influence.</p>
+</div>
+
+<div class="warning">
+<h3>Performance warning</h3>
+<p>Using this flag triggers the use of <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code>, without handling of persistent connections. This
+means the performance of your proxy will be better if you set it up with <code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code> or
+<code class="directive"><a href="../mod/mod_proxy.html#proxypassmatch">ProxyPassMatch</a></code></p>
+<p>This is because this flag triggers the use of the default worker, which does not handle connection pooling/reuse.</p>
+<p>Avoid using this flag and prefer those directives, whenever you can.</p>
+</div>
+
+<p>Note: <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code> must be enabled in order
+to use this flag.</p>
+
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="flag_pt" id="flag_pt">PT|passthrough</a></h2>
+
+<p>
+The target (or substitution string) in a RewriteRule is assumed to be a
+file path, by default. The use of the [PT] flag causes it to be treated
+as a URI instead. That is to say, the
+use of the [PT] flag causes the result of the <code class="directive"><a href="../mod/mod_rewrite.html#rewriterule">RewriteRule</a></code> to be passed back through
+URL mapping, so that location-based mappings, such as <code class="directive"><a href="../mod/mod_alias.html#alias">Alias</a></code>, <code class="directive"><a href="../mod/mod_alias.html#redirect">Redirect</a></code>, or <code class="directive"><a href="../mod/mod_alias.html#scriptalias">ScriptAlias</a></code>, for example, might have a
+chance to take effect.
+</p>
+
+<p>
+If, for example, you have an
+<code class="directive"><a href="../mod/mod_alias.html#alias">Alias</a></code>
+for /icons, and have a <code class="directive"><a href="../mod/mod_rewrite.html#rewriterule">RewriteRule</a></code> pointing there, you should
+use the [PT] flag to ensure that the
+<code class="directive"><a href="../mod/mod_alias.html#alias">Alias</a></code> is evaluated.
+</p>
+
+<pre class="prettyprint lang-config">Alias "/icons" "/usr/local/apache/icons"
+RewriteRule "/pics/(.+)\.jpg$" "/icons/$1.gif" [PT]</pre>
+
+
+<p>
+Omission of the [PT] flag in this case will cause the Alias to be
+ignored, resulting in a 'File not found' error being returned.
+</p>
+
+<p>The <code>PT</code> flag implies the <code>L</code> flag:
+rewriting will be stopped in order to pass the request to
+the next phase of processing.</p>
+
+<p>Note that the <code>PT</code> flag is implied in per-directory
+contexts such as
+<code class="directive"><a href="../mod/core.html#directory">&lt;Directory&gt;</a></code> sections
+or in <code>.htaccess</code> files. The only way to circumvent that
+is to rewrite to <code>-</code>.</p>
+
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="flag_qsa" id="flag_qsa">QSA|qsappend</a></h2>
+<p>
+When the replacement URI contains a query string, the default behavior
+of <code class="directive"><a href="../mod/mod_rewrite.html#rewriterule">RewriteRule</a></code> is to discard
+the existing query string, and replace it with the newly generated one.
+Using the [QSA] flag causes the query strings to be combined.
+</p>
+
+<p>Consider the following rule:</p>
+
+<pre class="prettyprint lang-config">RewriteRule "/pages/(.+)" "/page.php?page=$1" [QSA]</pre>
+
+
+<p>With the [QSA] flag, a request for <code>/pages/123?one=two</code> will be
+mapped to <code>/page.php?page=123&amp;one=two</code>. Without the [QSA]
+flag, that same request will be mapped to
+<code>/page.php?page=123</code> - that is, the existing query string
+will be discarded.
+</p>
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="flag_qsd" id="flag_qsd">QSD|qsdiscard</a></h2>
+<p>
+When the requested URI contains a query string, and the target URI does
+not, the default behavior of <code class="directive"><a href="../mod/mod_rewrite.html#rewriterule">RewriteRule</a></code> is to copy that query
+string to the target URI. Using the [QSD] flag causes the query string
+to be discarded.
+</p>
+
+<p>This flag is available in version 2.4.0 and later.</p>
+
+<p>
+Using [QSD] and [QSA] together will result in [QSD] taking precedence.
+</p>
+
+<p>
+If the target URI has a query string, the default behavior will be
+observed - that is, the original query string will be discarded and
+replaced with the query string in the <code>RewriteRule</code> target
+URI.
+</p>
+
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="flag_qsl" id="flag_qsl">QSL|qslast</a></h2>
+<p>
+By default, the first (left-most) question mark in the substitution
+delimits the path from the query string. Using the [QSL] flag instructs
+<code class="directive"><a href="../mod/mod_rewrite.html#rewriterule">RewriteRule</a></code> to instead split
+the two components using the last (right-most) question mark. </p>
+
+<p>
+This is useful when mapping to files that have literal question marks in
+their filename. If no query string is used in the substitution,
+a question mark can be appended to it in combination with this flag. </p>
+
+<p> This flag is available in version 2.4.19 and later.</p>
+
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="flag_r" id="flag_r">R|redirect</a></h2>
+<p>
+Use of the [R] flag causes a HTTP redirect to be issued to the browser.
+If a fully-qualified URL is specified (that is, including
+<code>http://servername/</code>) then a redirect will be issued to that
+location. Otherwise, the current protocol, servername, and port number
+will be used to generate the URL sent with the redirect.
+</p>
+
+<p>
+<em>Any</em> valid HTTP response status code may be specified,
+using the syntax [R=305], with a 302 status code being used by
+default if none is specified. The status code specified need not
+necessarily be a redirect (3xx) status code. However,
+if a status code is outside the redirect range (300-399) then the
+substitution string is dropped entirely, and rewriting is stopped as if
+the <code>L</code> were used.</p>
+
+<p>In addition to response status codes, you may also specify redirect
+status using their symbolic names: <code>temp</code> (default),
+<code>permanent</code>, or <code>seeother</code>.</p>
+
+<p>
+You will almost always want to use [R] in conjunction with [L] (that is,
+use [R,L]) because on its own, the [R] flag prepends
+<code>http://thishost[:thisport]</code> to the URI, but then passes this
+on to the next rule in the ruleset, which can often result in 'Invalid
+URI in request' warnings.
+</p>
+
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="flag_s" id="flag_s">S|skip</a></h2>
+<p>The [S] flag is used to skip rules that you don't want to run. The
+syntax of the skip flag is [S=<em>N</em>], where <em>N</em> signifies
+the number of rules to skip (provided the <code class="directive"><a href="../mod/mod_rewrite.html#rewriterule">
+RewriteRule</a></code> matches). This can be thought of as a <code>goto</code>
+statement in your rewrite ruleset. In the following example, we only want
+to run the <code class="directive"><a href="../mod/mod_rewrite.html#rewriterule">RewriteRule</a></code> if the
+requested URI doesn't correspond with an actual file.</p>
+
+<pre class="prettyprint lang-config"># Is the request for a non-existent file?
+RewriteCond "%{REQUEST_FILENAME}" "!-f"
+RewriteCond "%{REQUEST_FILENAME}" "!-d"
+# If so, skip these two RewriteRules
+RewriteRule ".?" "-" [S=2]
+
+RewriteRule "(.*\.gif)" "images.php?$1"
+RewriteRule "(.*\.html)" "docs.php?$1"</pre>
+
+
+<p>This technique is useful because a <code class="directive"><a href="../mod/mod_rewrite.html#rewritecond">RewriteCond</a></code> only applies to the
+<code class="directive"><a href="../mod/mod_rewrite.html#rewriterule">RewriteRule</a></code> immediately
+following it. Thus, if you want to make a <code>RewriteCond</code> apply
+to several <code>RewriteRule</code>s, one possible technique is to
+negate those conditions and add a <code>RewriteRule</code> with a [Skip] flag. You can
+use this to make pseudo if-then-else constructs: The last rule of
+the then-clause becomes <code>skip=N</code>, where N is the
+number of rules in the else-clause:</p>
+<pre class="prettyprint lang-config"># Does the file exist?
+RewriteCond "%{REQUEST_FILENAME}" "!-f"
+RewriteCond "%{REQUEST_FILENAME}" "!-d"
+# Create an if-then-else construct by skipping 3 lines if we meant to go to the "else" stanza.
+RewriteRule ".?" "-" [S=3]
+
+# IF the file exists, then:
+ RewriteRule "(.*\.gif)" "images.php?$1"
+ RewriteRule "(.*\.html)" "docs.php?$1"
+ # Skip past the "else" stanza.
+ RewriteRule ".?" "-" [S=1]
+# ELSE...
+ RewriteRule "(.*)" "404.php?file=$1"
+# END</pre>
+
+
+<p>It is probably easier to accomplish this kind of configuration using
+the <code class="directive">&lt;If&gt;</code>, <code class="directive">&lt;ElseIf&gt;</code>, and <code class="directive">&lt;Else&gt;</code> directives instead.</p>
+
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="flag_t" id="flag_t">T|type</a></h2>
+<p>Sets the MIME type with which the resulting response will be
+sent. This has the same effect as the <code class="directive"><a href="../mod/mod_mime.html#addtype">AddType</a></code> directive.</p>
+
+<p>For example, you might use the following technique to serve Perl
+source code as plain text, if requested in a particular way:</p>
+
+<pre class="prettyprint lang-config"># Serve .pl files as plain text
+RewriteRule "\.pl$" "-" [T=text/plain]</pre>
+
+
+<p>Or, perhaps, if you have a camera that produces jpeg images without
+file extensions, you could force those images to be served with the
+correct MIME type by virtue of their file names:</p>
+
+<pre class="prettyprint lang-config"># Files with 'IMG' in the name are jpg images.
+RewriteRule "IMG" "-" [T=image/jpg]</pre>
+
+
+<p>Please note that this is a trivial example, and could be better done
+using <code class="directive"><a href="../mod/core.html#filesmatch">&lt;FilesMatch&gt;</a></code>
+instead. Always consider the alternate
+solutions to a problem before resorting to rewrite, which will
+invariably be a less efficient solution than the alternatives.</p>
+
+<p>
+If used in per-directory context, use only <code>-</code> (dash)
+as the substitution <em>for the entire round of mod_rewrite processing</em>,
+otherwise the MIME-type set with this flag is lost due to an internal
+re-processing (including subsequent rounds of mod_rewrite processing).
+The <code>L</code> flag can be useful in this context to end the
+<em>current</em> round of mod_rewrite processing.</p>
+
+</div></div>
+<div class="bottomlang">
+<p><span>Available Languages: </span><a href="../en/rewrite/flags.html" title="English">&nbsp;en&nbsp;</a> |
+<a href="../fr/rewrite/flags.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 again 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 Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
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