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>mod_proxy_http - 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> 17<div id="page-header"> 18<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> 19<p class="apache">Apache HTTP Server Version 2.2</p> 20<img alt="" src="/images/feather.gif" /></div> 21<div class="up"><a href="./"><img title="<-" alt="<-" src="/images/left.gif" /></a></div> 22<div id="path"> 23<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="./">Modules</a></div> 24<div id="page-content"> 25<div id="preamble"><h1>Apache Module mod_proxy_http</h1> 26<div class="toplang"> 27<p><span>Available Languages: </span><a href="/en/mod/mod_proxy_http.html" title="English"> en </a> | 28<a href="/fr/mod/mod_proxy_http.html" hreflang="fr" rel="alternate" title="Fran�ais"> fr </a> | 29<a href="/ja/mod/mod_proxy_http.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a></p> 30</div> 31<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>HTTP support module for 32<code class="module"><a href="/mod/mod_proxy.html">mod_proxy</a></code></td></tr> 33<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr> 34<tr><th><a href="module-dict.html#ModuleIdentifier">Module�Identifier:</a></th><td>proxy_http_module</td></tr> 35<tr><th><a href="module-dict.html#SourceFile">Source�File:</a></th><td>mod_proxy_http.c</td></tr></table> 36<h3>Summary</h3> 37 38 <p>This module <em>requires</em> the service of <code class="module"><a href="/mod/mod_proxy.html">mod_proxy</a></code>. It provides the features used for 39 proxying HTTP and HTTPS requests. <code class="module"><a href="/mod/mod_proxy_http.html">mod_proxy_http</a></code> 40 supports HTTP/0.9, HTTP/1.0 and HTTP/1.1. It does <em>not</em> 41 provide any caching abilities. If you want to set up a caching 42 proxy, you might want to use the additional service of the 43 <code class="module"><a href="/mod/mod_cache.html">mod_cache</a></code> module.</p> 44 45 <p>Thus, in order to get the ability of handling HTTP proxy requests, 46 <code class="module"><a href="/mod/mod_proxy.html">mod_proxy</a></code> and <code class="module"><a href="/mod/mod_proxy_http.html">mod_proxy_http</a></code> 47 have to be present in the server.</p> 48 49 <div class="warning"><h3>Warning</h3> 50 <p>Do not enable proxying until you have <a href="mod_proxy.html#access">secured your server</a>. Open proxy 51 servers are dangerous both to your network and to the Internet at 52 large.</p> 53 </div> 54</div> 55<div id="quickview"><h3 class="directives">Directives</h3> 56<p>This module provides no 57 directives.</p> 58<h3>Topics</h3> 59<ul id="topics"> 60<li><img alt="" src="/images/down.gif" /> <a href="#env">Environment Variables</a></li> 61</ul><h3>See also</h3> 62<ul class="seealso"> 63<li><code class="module"><a href="/mod/mod_proxy.html">mod_proxy</a></code></li> 64<li><code class="module"><a href="/mod/mod_proxy_connect.html">mod_proxy_connect</a></code></li> 65</ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div> 66<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div> 67<div class="section"> 68<h2><a name="env" id="env">Environment Variables</a></h2> 69 <p>In addition to the configuration directives that control the 70 behaviour of <code class="module"><a href="/mod/mod_proxy.html">mod_proxy</a></code>, there are a number of 71 <dfn>environment variables</dfn> that control the HTTP protocol 72 provider. Environment variables below that don't specify specific values 73 are enabled when set to any value.</p> 74 <dl> 75 <dt>proxy-sendextracrlf</dt> 76 <dd>Causes proxy to send an extra CR-LF newline on the end of a 77 request. This is a workaround for a bug in some browsers.</dd> 78 <dt>force-proxy-request-1.0</dt> 79 <dd>Forces the proxy to send requests to the backend as HTTP/1.0 80 and disables HTTP/1.1 features.</dd> 81 <dt>proxy-nokeepalive</dt> 82 <dd>Forces the proxy to close the backend connection after 83 each request.</dd> 84 <dt>proxy-chain-auth</dt> 85 <dd>If the proxy requires authentication, it will read and 86 consume the proxy authentication credentials sent by the client. 87 With <var>proxy-chain-auth</var> it will <em>also</em> forward 88 the credentials to the next proxy in the chain. This may 89 be necessary if you have a chain of proxies that share 90 authentication information. <strong>Security Warning:</strong> 91 Do not set this unless you know you need it, as it forwards 92 sensitive information!</dd> 93 <dt>proxy-sendcl</dt> 94 <dd>HTTP/1.0 required all HTTP requests that include a body 95 (e.g. POST requests) to include a <var>Content-Length</var> 96 header. This environment variable forces the Apache proxy to 97 send this header to the backend server, regardless of what the 98 Client sent to the proxy. It ensures compatibility when 99 proxying for an HTTP/1.0 or unknown backend. However, it 100 may require the entire request to be buffered by the proxy, 101 so it becomes very inefficient for large requests.</dd> 102 <dt>proxy-sendchunks or proxy-sendchunked</dt> 103 <dd>This is the opposite of <var>proxy-sendcl</var>. It allows 104 request bodies to be sent to the backend using chunked transfer 105 encoding. This allows the request to be efficiently streamed, 106 but requires that the backend server supports HTTP/1.1.</dd> 107 <dt>proxy-interim-response</dt> 108 <dd>This variable takes values <code>RFC</code> or 109 <code>Suppress</code>. Earlier httpd versions would suppress 110 HTTP interim (1xx) responses sent from the backend. This is 111 technically a violation of the HTTP protocol. In practice, 112 if a backend sends an interim response, it may itself be 113 extending the protocol in a manner we know nothing about, 114 or just broken. So this is now configurable: set 115 <code>proxy-interim-response RFC</code> to be fully protocol 116 compliant, or <code>proxy-interim-response Suppress</code> 117 to suppress interim responses.</dd> 118 <dt>proxy-initial-not-pooled</dt> 119 <dd>If this variable is set no pooled connection will be reused 120 if the client connection is an initial connection. This avoids 121 the "proxy: error reading status line from remote server" error message 122 caused by the race condition that the backend server closed the 123 pooled connection after the connection check by the proxy and 124 before data sent by the proxy reached the backend. It has to be 125 kept in mind that setting this variable downgrades performance, 126 especially with HTTP/1.0 clients. 127 </dd> 128 </dl> 129</div> 130</div> 131<div class="bottomlang"> 132<p><span>Available Languages: </span><a href="/en/mod/mod_proxy_http.html" title="English"> en </a> | 133<a href="/fr/mod/mod_proxy_http.html" hreflang="fr" rel="alternate" title="Fran�ais"> fr </a> | 134<a href="/ja/mod/mod_proxy_http.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a></p> 135</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. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. 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