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| <title>Using mod_rewrite for Proxying - Apache HTTP Server</title> |
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| <p class="apache">Apache HTTP Server Version 2.5</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 2.5</a> > <a href="./">Rewrite</a></div><div id="page-content"><div id="preamble"><h1>Using mod_rewrite for Proxying</h1> |
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| <p><span>Available Languages: </span><a href="../en/rewrite/proxy.html" title="English"> en </a></p> |
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| |
| |
| <p>This document supplements the <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> |
| <a href="../mod/mod_rewrite.html">reference documentation</a>. It describes |
| how to use the RewriteRule's [P] flag to proxy content to another server. |
| A number of recipes are provided that describe common scenarios.</p> |
| |
| </div> |
| <div id="quickview"><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="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></ul></div> |
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| <h2><a name="dynamic-proxy" id="dynamic-proxy">Proxying Content with mod_rewrite</a></h2> |
| |
| |
| |
| <dl> |
| <dt>Description:</dt> |
| |
| <dd> |
| <p> |
| mod_rewrite provides the [P] flag, which allows URLs to be passed, |
| via mod_proxy, to another server. Two examples are given here. In |
| one example, a URL is passed directly to another server, and served |
| as though it were a local URL. In the other example, we proxy |
| missing content to a back-end server.</p> |
| </dd> |
| |
| <dt>Solution:</dt> |
| |
| <dd> |
| <p>To simply map a URL to another server, we use the [P] flag, as |
| follows:</p> |
| |
| <div class="example"><p><code> |
| RewriteEngine on<br /> |
| RewriteBase /products/<br /> |
| RewriteRule ^<strong>widget/</strong>(.*)$ <strong>http://product.example.com/widget/</strong>$1 [<strong>P</strong>]<br /> |
| ProxyPassReverse /products/widget/ http://product.example.com/widget/ |
| </code></p></div> |
| |
| <p>In the second example, we proxy the request only if we can't find |
| the resource locally. This can be very useful when you're migrating |
| from one server to another, and you're not sure if all the content |
| has been migrated yet.</p> |
| |
| <div class="example"><p><code> |
| RewriteCond %{REQUEST_FILENAME} <strong>!-f</strong><br /> |
| RewriteCond %{REQUEST_FILENAME} <strong>!-d</strong><br /> |
| RewriteRule ^/(.*) http://<strong>old</strong>.example.com/$1 [<strong>P</strong>]<br /> |
| ProxyPassReverse / http://old.example.com/ |
| </code></p></div> |
| </dd> |
| |
| <dt>Discussion:</dt> |
| |
| <dd><p>In each case, we add a <code class="directive"><a href="../mod/mod_proxy.html#proxypassreverse">ProxyPassReverse</a></code> directive to ensure |
| that any redirects issued by the backend are correctly passed on to |
| the client.</p> |
| |
| <p>Consider using either <code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code> or <code class="directive"><a href="../mod/mod_rewrite.html#proxypassmatch">ProxyPassMatch</a></code> whenever possible in |
| preference to mod_rewrite.</p> |
| </dd> |
| </dl> |
| |
| </div></div> |
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| <p><span>Available Languages: </span><a href="../en/rewrite/proxy.html" title="English"> en </a></p> |
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| <p class="apache">Copyright 2012 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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