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.min.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 2.4</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 2.4</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> | 25<a href="/fr/rewrite/proxy.html" hreflang="fr" rel="alternate" title="Fran�ais"> fr </a></p> 26</div> 27 28 29<p>This document supplements the <code class="module"><a href="/mod/mod_rewrite.html">mod_rewrite</a></code> 30<a href="/mod/mod_rewrite.html">reference documentation</a>. It describes 31how to use the RewriteRule's [P] flag to proxy content to another server. 32A number of recipes are provided that describe common scenarios.</p> 33 34</div> 35<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><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div> 36<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div> 37<div class="section"> 38<h2><a name="dynamic-proxy" id="dynamic-proxy">Proxying Content with mod_rewrite</a></h2> 39 40 41 42 <dl> 43 <dt>Description:</dt> 44 45 <dd> 46 <p> 47 mod_rewrite provides the [P] flag, which allows URLs to be passed, 48 via mod_proxy, to another server. Two examples are given here. In 49 one example, a URL is passed directly to another server, and served 50 as though it were a local URL. In the other example, we proxy 51 missing content to a back-end server.</p> 52 </dd> 53 54 <dt>Solution:</dt> 55 56 <dd> 57 <p>To simply map a URL to another server, we use the [P] flag, as 58 follows:</p> 59 60<pre class="prettyprint lang-config">RewriteEngine on 61RewriteBase /products/ 62RewriteRule ^widget/(.*)$ http://product.example.com/widget/$1 [P] 63ProxyPassReverse /products/widget/ http://product.example.com/widget/</pre> 64 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<pre class="prettyprint lang-config">RewriteCond %{REQUEST_FILENAME} !-f 72RewriteCond %{REQUEST_FILENAME} !-d 73RewriteRule ^/(.*) http://old.example.com/$1 [P] 74ProxyPassReverse / http://old.example.com/</pre> 75 76 </dd> 77 78 <dt>Discussion:</dt> 79 80 <dd><p>In each case, we add a <code class="directive"><a href="/mod/mod_proxy.html#proxypassreverse">ProxyPassReverse</a></code> directive to ensure 81 that any redirects issued by the backend are correctly passed on to 82 the client.</p> 83 84 <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 85 preference to mod_rewrite.</p> 86 </dd> 87 </dl> 88 89</div></div> 90<div class="bottomlang"> 91<p><span>Available Languages: </span><a href="/en/rewrite/proxy.html" title="English"> en </a> | 92<a href="/fr/rewrite/proxy.html" hreflang="fr" rel="alternate" title="Fran�ais"> fr </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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