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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 2.3</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>
cfbca4e518f4981f435e93e434f17271e6efc138rbowen<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>
e60187855fd0488f48f37e88acde742754308d39rbowen<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>
cfbca4e518f4981f435e93e434f17271e6efc138rbowen <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
cfbca4e518f4981f435e93e434f17271e6efc138rbowen proxying HTTP and HTTPS requests. <code class="module"><a href="/mod/mod_proxy_http.html">mod_proxy_http</a></code>
cfbca4e518f4981f435e93e434f17271e6efc138rbowen 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>
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen <p>Thus, in order to get the ability of handling HTTP proxy requests,
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen <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>
cfbca4e518f4981f435e93e434f17271e6efc138rbowen 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
c44eeebd065e2c8cd028016b45c58afb480aaf8fdruggeri servers are dangerous both to your network and to the Internet at
cfbca4e518f4981f435e93e434f17271e6efc138rbowen<div id="quickview"><h3 class="directives">Directives</h3>
3b35091b9c1ae36ee3d0e64ebbfdba58062290ffrbowen<p>This module provides no
cfbca4e518f4981f435e93e434f17271e6efc138rbowen directives.</p>
cfbca4e518f4981f435e93e434f17271e6efc138rbowen<li><img alt="" src="/images/down.gif" /> <a href="#env">Environment Variables</a></li>
cfbca4e518f4981f435e93e434f17271e6efc138rbowen<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<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>
cfbca4e518f4981f435e93e434f17271e6efc138rbowen <p>In addition to the configuration directives that control the
4aa603e6448b99f9371397d439795c91a93637eand 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
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen provider:</p>
c3c937a1510d6ff9cfa28ef3713e787f0e1a39c9coar <dd>Causes proxy to send an extra CR-LF newline on the end of a
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen request. This is a workaround for a bug in some browsers.</dd>
430b9854ae290aa3f76164c93193c6c11ace5c0crbowen <dd>Forces the proxy to send requests to the backend as HTTP/1.0
cfbca4e518f4981f435e93e434f17271e6efc138rbowen <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
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen 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
4aa603e6448b99f9371397d439795c91a93637eand be necessary if you have a chain of proxies that share
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen 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,
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen but requires that the backend server supports HTTP/1.1.</dd>
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen <dd>This variable takes values <code>RFC</code> (the default) or
d5e8240ee767cced65a45a2b9d590ca08b3d3859rbowen <code>Suppress</code>. Earlier httpd versions would suppress
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen HTTP interim (1xx) responses sent from the backend. This is
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen technically a violation of the HTTP protocol. In practice,
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen if a backend sends an interim response, it may itself be
6bd107eca11c1c863fbb036f657ed774f27ccb1bigalic 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,
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen</div><div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div>
c3c937a1510d6ff9cfa28ef3713e787f0e1a39c9coar <p><code class="module"><a href="/mod/mod_proxy_http.html">mod_proxy_http</a></code> creates the following request notes for
cfbca4e518f4981f435e93e434f17271e6efc138rbowen <code class="directive"><a href="/mod/mod_log_config.html#logformat">LogFormat</a></code> or
cfbca4e518f4981f435e93e434f17271e6efc138rbowen <code class="directive"><a href="/mod/core.html#errorlogformat">ErrorLogFormat</a></code>:
3b35091b9c1ae36ee3d0e64ebbfdba58062290ffrbowen <dd>The local port used for the connection to the backend server.</dd>
11a346d1a1cdd14cbc7b75e971fc22dc1358c28drbowen <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> |
4aa603e6448b99f9371397d439795c91a93637eand<a href="/fr/mod/mod_proxy_http.html" hreflang="fr" rel="alternate" title="Fran�ais"> fr </a></p>
3b35091b9c1ae36ee3d0e64ebbfdba58062290ffrbowen<p class="apache">Copyright 2011 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/directives.html">Directives</a> | <a href="/faq/">FAQ</a> | <a href="/glossary.html">Glossary</a> | <a href="/sitemap.html">Sitemap</a></p></div>