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<title>Apache mod_rewrite - Apache HTTP Server</title>
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<p class="apache">Apache HTTP Server Version 2.2</p>
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<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 2.2</a></div><div id="page-content"><div id="preamble"><h1>Apache mod_rewrite</h1>
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    <p><code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> provides a way to modify incoming
    URL requests, dynamically, based on <a href="intro.html#regex">regular 
    expression</a> rules. This allows you to map arbitrary URLs onto
    your internal URL structure in any way you like.</p>

      <p>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 programs 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">&lt;VirtualHost&gt;</a></code> blocks), or
      per-directory context (<code>.htaccess</code> files and <code class="directive"><a href="../mod/core.html#directory">&lt;Directory&gt;</a></code> blocks). The
      rewritten result can lead to further rules, internal
      sub-processing, external request redirection, or proxy
      passthrough, depending on what <a href="flags.html">flags</a> you
      attach to the rules.</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>
<li><a href="../mod/mod_rewrite.html">mod_rewrite reference
documentation</a></li>
<li><a href="intro.html">Introduction to regular expressions and mod_rewrite</a></li>
<li><a href="remapping.html">Using mod_rewrite for redirection and remapping of URLs</a></li>
<li><a href="access.html">Using mod_rewrite to control access</a></li>
<li><a href="vhosts.html">Dynamic virtual hosts with mod_rewrite</a></li>
<li><a href="proxy.html">Dynamic proxying with mod_rewrite</a></li>
<li><a href="rewritemap.html">Using RewriteMap</a></li>
<li><a href="advanced.html">Advanced techniques and tricks</a></li>
<li><a href="avoid.html">When <strong>NOT</strong> to use mod_rewrite</a></li>
<li><a href="flags.html">RewriteRule Flags</a></li>
<li><a href="tech.html">Technical details</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
wiki</a></li><li><a href="../glossary.html">Glossary</a></li></ul></div>
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