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<title>Apache mod_rewrite - Apache HTTP Server</title>
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<p class="menu"><a href="/mod/">Modules</a> | <a href="/mod/directives.html">Directives</a> | <a href="/faq/">FAQ</a> | <a href="/glossary.html">Glossary</a> | <a href="/sitemap.html">Sitemap</a></p>
<p class="apache">Apache HTTP Server Version 2.3</p>
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<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 2.3</a></div><div id="page-content"><div id="preamble"><h1>Apache mod_rewrite</h1>
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<p>mod_rewrite uses a rule-based rewriting engine (based on a
regular-expression parser) to rewrite requested URLs on the
fly. It supports an unlimited number of rules and an
unlimited number of attached rule conditions for each rule to
provide a really flexible and powerful URL manipulation
mechanism. The URL manipulations can depend on various tests:
server variables, environment variables, HTTP
headers, time stamps external database lookups, and various other
external processes or handlers, can be used to achieve granular URL
matching.</p>
<p>Rewrite rules can operate on the full URLs, including the path-info
and query string portions, and may be used in per-server context
(<code>httpd.conf</code>), per-virtualhost context (<code class="directive"><a href="/mod/core.html#virtualhost"><VirtualHost></a></code> blocks), or
per-directory context (<code>.htaccess</code> files and <code class="directive"><a href="/mod/core.html#directory"><Directory></a></code> blocks). The
rewritten result can lead to further rules, internal
sub-processing, external request redirection, or proxy
passthrough.</p>
<p>Since mod_rewrite is so powerful, it can indeed be rather
complex. This document supplements the <a href="/mod/mod_rewrite.html">reference documentation</a>, and
attempts to allay some of that complexity, and provide highly
annoted examples of common scenarios that you may handle with
mod_rewrite. But we also attempt to show you when you should not
use mod_rewrite, and use other standard Apache features instead,
thus avoiding this unnecessary complexity.</p>
<ul>
documentation</a></li>
mod_rewrite</a></li>
remapping of URLs</a></li>
</ul>
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<div id="quickview"><h3>See also</h3><ul class="seealso"><li><a href="/mod/mod_rewrite.html">mod_rewrite reference
documentation</a></li><li><a href="/urlmapping.html">Mapping URLs to the Filesystem</a></li><li><a href="http://wiki.apache.org/httpd/Rewrite">mod_rewrite
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<p class="apache">Copyright 2009 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
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