mod_proxy_http.html.en revision af33a4994ae2ff15bc67d19ff1a7feb906745bf8
cfbca4e518f4981f435e93e434f17271e6efc138rbowen<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
cfbca4e518f4981f435e93e434f17271e6efc138rbowen<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!--
cfbca4e518f4981f435e93e434f17271e6efc138rbowen XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
cfbca4e518f4981f435e93e434f17271e6efc138rbowen This file is generated from xml source: DO NOT EDIT
cfbca4e518f4981f435e93e434f17271e6efc138rbowen XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
cfbca4e518f4981f435e93e434f17271e6efc138rbowen<link href="/style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
cfbca4e518f4981f435e93e434f17271e6efc138rbowen<link href="/style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
cfbca4e518f4981f435e93e434f17271e6efc138rbowen<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" />
2e545ce2450a9953665f701bb05350f0d3f26275nd<script src="/style/scripts/prettify.js" type="text/javascript">
cfbca4e518f4981f435e93e434f17271e6efc138rbowen<link href="/images/favicon.ico" rel="shortcut icon" /></head>
af33a4994ae2ff15bc67d19ff1a7feb906745bf8rbowen<p class="menu"><a href="/mod/">Modules</a> | <a href="/mod/quickreference.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>
cfbca4e518f4981f435e93e434f17271e6efc138rbowen<div class="up"><a href="./"><img title="<-" alt="<-" src="/images/left.gif" /></a></div>
cfbca4e518f4981f435e93e434f17271e6efc138rbowen<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="./">Modules</a></div>
cfbca4e518f4981f435e93e434f17271e6efc138rbowen<div id="preamble"><h1>Apache Module mod_proxy_http</h1>
cfbca4e518f4981f435e93e434f17271e6efc138rbowen<p><span>Available Languages: </span><a href="/en/mod/mod_proxy_http.html" title="English"> en </a> |
cfbca4e518f4981f435e93e434f17271e6efc138rbowen<a href="/fr/mod/mod_proxy_http.html" hreflang="fr" rel="alternate" title="Fran�ais"> fr </a></p>
e60187855fd0488f48f37e88acde742754308d39rbowen<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>HTTP support module for
cfbca4e518f4981f435e93e434f17271e6efc138rbowen<code class="module"><a href="/mod/mod_proxy.html">mod_proxy</a></code></td></tr>
cfbca4e518f4981f435e93e434f17271e6efc138rbowen<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
cfbca4e518f4981f435e93e434f17271e6efc138rbowen<tr><th><a href="module-dict.html#ModuleIdentifier">Module�Identifier:</a></th><td>proxy_http_module</td></tr>
cfbca4e518f4981f435e93e434f17271e6efc138rbowen<tr><th><a href="module-dict.html#SourceFile">Source�File:</a></th><td>mod_proxy_http.c</td></tr></table>
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen <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
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen proxying HTTP and HTTPS requests. <code class="module"><a href="/mod/mod_proxy_http.html">mod_proxy_http</a></code>
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen supports HTTP/0.9, HTTP/1.0 and HTTP/1.1. It does <em>not</em>
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen provide any caching abilities. If you want to set up a caching
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen proxy, you might want to use the additional service of the
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen <code class="module"><a href="/mod/mod_cache.html">mod_cache</a></code> module.</p>
c44eeebd065e2c8cd028016b45c58afb480aaf8fdruggeri <p>Thus, in order to get the ability of handling HTTP proxy requests,
c44eeebd065e2c8cd028016b45c58afb480aaf8fdruggeri <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>
c44eeebd065e2c8cd028016b45c58afb480aaf8fdruggeri have to be present in the server.</p>
c44eeebd065e2c8cd028016b45c58afb480aaf8fdruggeri <p>Do not enable proxying until you have <a href="mod_proxy.html#access">secured your server</a>. Open proxy
cfbca4e518f4981f435e93e434f17271e6efc138rbowen servers are dangerous both to your network and to the Internet at
cfbca4e518f4981f435e93e434f17271e6efc138rbowen<div id="quickview"><h3 class="directives">Directives</h3>
c44eeebd065e2c8cd028016b45c58afb480aaf8fdruggeri<p>This module provides no
cfbca4e518f4981f435e93e434f17271e6efc138rbowen directives.</p>
9546947d8f7082fb4b70e1659feb5460502b73e4rbowen<li><img alt="" src="/images/down.gif" /> <a href="#env">Environment Variables</a></li>
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen<li><img alt="" src="/images/down.gif" /> <a href="#notes">Request notes</a></li>
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen<li><code class="module"><a href="/mod/mod_proxy.html">mod_proxy</a></code></li>
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen<li><code class="module"><a href="/mod/mod_proxy_connect.html">mod_proxy_connect</a></code></li>
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen</ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
cfbca4e518f4981f435e93e434f17271e6efc138rbowen<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div>
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen<h2><a name="env" id="env">Environment Variables</a></h2>
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen <p>In addition to the configuration directives that control the
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen behaviour of <code class="module"><a href="/mod/mod_proxy.html">mod_proxy</a></code>, there are a number of
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen <dfn>environment variables</dfn> that control the HTTP protocol
c3c937a1510d6ff9cfa28ef3713e787f0e1a39c9coar provider:</p>
430b9854ae290aa3f76164c93193c6c11ace5c0crbowen <dd>Causes proxy to send an extra CR-LF newline on the end of a
4aa603e6448b99f9371397d439795c91a93637eand request. This is a workaround for a bug in some browsers.</dd>
cfbca4e518f4981f435e93e434f17271e6efc138rbowen <dd>Forces the proxy to send requests to the backend as HTTP/1.0
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen <dd>Forces the proxy to close the backend connection after
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen each request.</dd>
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen <dd>If the proxy requires authentication, it will read and
4aa603e6448b99f9371397d439795c91a93637eand consume the proxy authentication credentials sent by the client.
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen With <var>proxy-chain-auth</var> it will <em>also</em> forward
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen the credentials to the next proxy in the chain. This may
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen be necessary if you have a chain of proxies that share
4aa603e6448b99f9371397d439795c91a93637eand authentication information. <strong>Security Warning:</strong>
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen Do not set this unless you know you need it, as it forwards
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen sensitive information!</dd>
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen <dd>HTTP/1.0 required all HTTP requests that include a body
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen (e.g. POST requests) to include a <var>Content-Length</var>
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen header. This environment variable forces the Apache proxy to
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen send this header to the backend server, regardless of what the
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen Client sent to the proxy. It ensures compatibility when
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen proxying for an HTTP/1.0 or unknown backend. However, it
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen may require the entire request to be buffered by the proxy,
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen so it becomes very inefficient for large requests.</dd>
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen <dd>This is the opposite of <var>proxy-sendcl</var>. It allows
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen request bodies to be sent to the backend using chunked transfer
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen encoding. This allows the request to be efficiently streamed,
d5e8240ee767cced65a45a2b9d590ca08b3d3859rbowen but requires that the backend server supports HTTP/1.1.</dd>
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen <dd>This variable takes values <code>RFC</code> (the default) or
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen <code>Suppress</code>. Earlier httpd versions would suppress
6bd107eca11c1c863fbb036f657ed774f27ccb1bigalic HTTP interim (1xx) responses sent from the backend. This is
5d01f40ffd657dd2ac567aacd93cabd162ddfa79coar technically a violation of the HTTP protocol. In practice,
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen if a backend sends an interim response, it may itself be
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen extending the protocol in a manner we know nothing about,
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen or just broken. So this is now configurable: set
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen <code>proxy-interim-response RFC</code> to be fully protocol
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen compliant, or <code>proxy-interim-response Suppress</code>
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen to suppress interim responses.</dd>
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen <dd>If this variable is set no pooled connection will be reused
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen if the client connection is an initial connection. This avoids
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen the "proxy: error reading status line from remote server" error message
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen caused by the race condition that the backend server closed the
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen pooled connection after the connection check by the proxy and
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen before data sent by the proxy reached the backend. It has to be
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen kept in mind that setting this variable downgrades performance,
c3c937a1510d6ff9cfa28ef3713e787f0e1a39c9coar</div><div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div>
cfbca4e518f4981f435e93e434f17271e6efc138rbowen <p><code class="module"><a href="/mod/mod_proxy_http.html">mod_proxy_http</a></code> creates the following request notes for
3b35091b9c1ae36ee3d0e64ebbfdba58062290ffrbowen <code class="directive"><a href="/mod/mod_log_config.html#logformat">LogFormat</a></code> or
3b35091b9c1ae36ee3d0e64ebbfdba58062290ffrbowen <code class="directive"><a href="/mod/core.html#errorlogformat">ErrorLogFormat</a></code>:
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen <dd>The local port used for the connection to the backend server.</dd>
3b35091b9c1ae36ee3d0e64ebbfdba58062290ffrbowen <dd>The HTTP status received from the backend server.</dd>
3b35091b9c1ae36ee3d0e64ebbfdba58062290ffrbowen<p><span>Available Languages: </span><a href="/en/mod/mod_proxy_http.html" title="English"> en </a> |
3b35091b9c1ae36ee3d0e64ebbfdba58062290ffrbowen<a href="/fr/mod/mod_proxy_http.html" hreflang="fr" rel="alternate" title="Fran�ais"> fr </a></p>
3b35091b9c1ae36ee3d0e64ebbfdba58062290ffrbowen</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. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
3b35091b9c1ae36ee3d0e64ebbfdba58062290ffrbowen<script type="text/javascript"><!--//--><![CDATA[//><!--
3b35091b9c1ae36ee3d0e64ebbfdba58062290ffrbowenvar comments_shortname = 'httpd';
c3c937a1510d6ff9cfa28ef3713e787f0e1a39c9coarvar comments_identifier = 'http://httpd.apache.org/docs/trunk/mod/mod_proxy_http.html';
3b35091b9c1ae36ee3d0e64ebbfdba58062290ffrbowen(function(w, d) {
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen if (w.location.hostname.toLowerCase() == "httpd.apache.org") {
1f1b6bf13313fdd14a45e52e553d3ff28689b717coar d.write('<div id="comments_thread"><\/div>');
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen var s = d.createElement('script');
3b35091b9c1ae36ee3d0e64ebbfdba58062290ffrbowen s.src = 'https://comments.apache.org/show_comments.lua?site=' + comments_shortname + '&page=' + comments_identifier;
1f1b6bf13313fdd14a45e52e553d3ff28689b717coar (d.getElementsByTagName('head')[0] || d.getElementsByTagName('body')[0]).appendChild(s);
3b35091b9c1ae36ee3d0e64ebbfdba58062290ffrbowen d.write('<div id="comments_thread">Comments are disabled for this page at the moment.<\/div>');
3b35091b9c1ae36ee3d0e64ebbfdba58062290ffrbowen})(window, document);
3b35091b9c1ae36ee3d0e64ebbfdba58062290ffrbowen<p class="apache">Copyright 2013 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>
3b35091b9c1ae36ee3d0e64ebbfdba58062290ffrbowen<p class="menu"><a href="/mod/">Modules</a> | <a href="/mod/quickreference.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></div><script type="text/javascript"><!--//--><![CDATA[//><!--
3b35091b9c1ae36ee3d0e64ebbfdba58062290ffrbowenif (typeof(prettyPrint) !== 'undefined') {
4aa603e6448b99f9371397d439795c91a93637eand prettyPrint();