1<?xml version="1.0" encoding="ISO-8859-1"?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 3<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!-- 4 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 5 This file is generated from xml source: DO NOT EDIT 6 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 7 --> 8<title>Using mod_rewrite for Proxying - Apache HTTP Server</title> 9<link href="/style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> 10<link href="/style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> 11<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" /> 12<script src="/style/scripts/prettify.js" type="text/javascript"> 13</script> 14 15<link href="/images/favicon.ico" rel="shortcut icon" /></head> 16<body id="manual-page"><div id="page-header"> 17<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> 18<p class="apache">Apache HTTP Server Version 2.2</p> 19<img alt="" src="/images/feather.gif" /></div> 20<div class="up"><a href="./"><img title="<-" alt="<-" src="/images/left.gif" /></a></div> 21<div id="path"> 22<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 2.2</a> > <a href="./">Rewrite</a></div><div id="page-content"><div id="preamble"><h1>Using mod_rewrite for Proxying</h1> 23<div class="toplang"> 24<p><span>Available Languages: </span><a href="/en/rewrite/proxy.html" title="English"> en </a></p> 25</div> 26 27 28<p>This document supplements the <code class="module"><a href="/mod/mod_rewrite.html">mod_rewrite</a></code> 29<a href="/mod/mod_rewrite.html">reference documentation</a>. It describes 30how to use the RewriteRule's [P] flag to proxy content to another server. 31A number of recipes are provided that describe common scenarios.</p> 32 33</div> 34<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 and tricks</a></li><li><a href="avoid.html">When not to use mod_rewrite</a></li></ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div> 35<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div> 36<div class="section"> 37<h2><a name="dynamic-proxy" id="dynamic-proxy">Proxying Content with mod_rewrite</a></h2> 38 39 40 41 <dl> 42 <dt>Description:</dt> 43 44 <dd> 45 <p> 46 mod_rewrite provides the [P] flag, which allows URLs to be passed, 47 via mod_proxy, to another server. Two examples are given here. In 48 one example, a URL is passed directly to another server, and served 49 as though it were a local URL. In the other example, we proxy 50 missing content to a back-end server.</p> 51 </dd> 52 53 <dt>Solution:</dt> 54 55 <dd> 56 <p>To simply map a URL to another server, we use the [P] flag, as 57 follows:</p> 58 59<div class="example"><p><code> 60RewriteEngine on<br /> 61RewriteBase /products/<br /> 62RewriteRule ^<strong>widget/</strong>(.*)$ <strong>http://product.example.com/widget/</strong>$1 [<strong>P</strong>]<br /> 63ProxyPassReverse /products/widget/ http://product.example.com/widget/ 64</code></p></div> 65 66 <p>In the second example, we proxy the request only if we can't find 67 the resource locally. This can be very useful when you're migrating 68 from one server to another, and you're not sure if all the content 69 has been migrated yet.</p> 70 71<div class="example"><p><code> 72RewriteCond %{REQUEST_FILENAME} <strong>!-f</strong><br /> 73RewriteCond %{REQUEST_FILENAME} <strong>!-d</strong><br /> 74RewriteRule ^/(.*) http://<strong>old</strong>.example.com/$1 [<strong>P</strong>]<br /> 75ProxyPassReverse / http://old.example.com/ 76</code></p></div> 77 </dd> 78 79 <dt>Discussion:</dt> 80 81 <dd><p>In each case, we add a <code class="directive"><a href="/mod/mod_proxy.html#proxypassreverse">ProxyPassReverse</a></code> directive to ensure 82 that any redirects issued by the backend are correctly passed on to 83 the client.</p> 84 85 <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_proxy.html#proxypassmatch">ProxyPassMatch</a></code> whenever possible in 86 preference to mod_rewrite.</p> 87 </dd> 88 </dl> 89 90</div></div> 91<div class="bottomlang"> 92<p><span>Available Languages: </span><a href="/en/rewrite/proxy.html" title="English"> en </a></p> 93</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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