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8 <title>mod_proxy_http - Apache HTTP Server</title>
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16 <p class="apache">Apache HTTP Server Version 2.3</p>
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20 <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>
21 <div id="page-content">
22 <div id="preamble"><h1>Apache Module mod_proxy_http</h1>
24 <p><span>Available Languages: </span><a href="../en/mod/mod_proxy_http.html" title="English"> en </a></p>
26 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>HTTP support module for
27 <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></td></tr>
28 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
29 <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>proxy_http_module</td></tr>
30 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>proxy_http.c</td></tr></table>
33 <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
34 proxying HTTP requests. <code class="module"><a href="../mod/mod_proxy_http.html">mod_proxy_http</a></code>
35 supports HTTP/0.9, HTTP/1.0 and HTTP/1.1. It does <em>not</em>
36 provide any caching abilities. If you want to set up a caching
37 proxy, you might want to use the additional service of the
38 <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> module.</p>
40 <p>Thus, in order to get the ability of handling HTTP proxy requests,
41 <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>
42 have to be present in the server.</p>
44 <div class="warning"><h3>Warning</h3>
45 <p>Do not enable proxying until you have <a href="mod_proxy.html#access">secured your server</a>. Open proxy
46 servers are dangerous both to your network and to the Internet at
50 <div id="quickview"><h3 class="directives">Directives</h3>
51 <p>This module provides no
55 <li><img alt="" src="../images/down.gif" /> <a href="#env">Environment Variables</a></li>
56 </ul><h3>See also</h3>
58 <li><code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></li>
59 <li><code class="module"><a href="../mod/mod_proxy_connect.html">mod_proxy_connect</a></code></li>
61 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
63 <h2><a name="env" id="env">Environment Variables</a></h2>
64 <p>In addition to the configuration directives that control the
65 behaviour of <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code>, there are a number of
66 <dfn>environment variables</dfn> that control the HTTP protocol
69 <dt>proxy-sendextracrlf</dt>
70 <dd>Causes proxy to send an extra CR-LF newline on the end of a
71 request. This is a workaround for a bug in some browsers.</dd>
72 <dt>force-proxy-request-1.0</dt>
73 <dd>Forces the proxy to send requests to the backend as HTTP/1.0
74 and disables HTTP/1.1 features.</dd>
75 <dt>proxy-nokeepalive</dt>
76 <dd>Forces the proxy to close the backend connection after
78 <dt>Proxy-Chain-Auth</dt>
79 <dd>If the proxy requires authentication, it will read and
80 consume the proxy authentication credentials sent by the client.
81 With <var>Proxy-Chain-Auth</var> it will <em>also</em> forward
82 the credentials to the next proxy in the chain. This may
83 be necessary if you have a chain of proxies that share
84 authentication information. <strong>Security Warning:</strong>
85 Do not set this unless you know you need it, as it forwards
86 sensitive information!</dd>
88 <dd>HTTP/1.0 required all HTTP requests that include a body
89 (e.g. POST requests) to include a <var>Content-Length</var>
90 header. This environment variable forces the Apache proxy to
91 send this header to the backend server, regardless of what the
92 Client sent to the proxy. It ensures compatibility when
93 proxying for an HTTP/1.0 or unknown backend. However, it
94 may require the entire request to be buffered by the proxy,
95 so it becomes very inefficient for large requests.</dd>
96 <dt>proxy-sendchunks or proxy-sendchunked</dt>
97 <dd>This is the opposite of <var>proxy-sendcl</var>. It allows
98 request bodies to be sent to the backend using chunked transfer
99 encoding. This allows the request to be efficiently streamed,
100 but requires that the backend server supports HTTP/1.1.</dd>
101 <dt>proxy-interim-response</dt>
102 <dd>This variable takes values <code>RFC</code> or
103 <code>Suppress</code>. Earlier httpd versions would suppress
104 HTTP interim (1xx) responses sent from the backend. This is
105 technically a violation of the HTTP protocol. In practice,
106 if a backend sends an interim response, it may itself be
107 extending the protocol in a manner we know nothing about,
108 or just broken. So this is now configurable: set
109 <code>proxy-interim-response RFC</code> to be fully protocol
110 compliant, or <code>proxy-interim-response Suppress</code>
111 to suppress interim responses.</dd>
115 <div class="bottomlang">
116 <p><span>Available Languages: </span><a href="../en/mod/mod_proxy_http.html" title="English"> en </a></p>
117 </div><div id="footer">
118 <p class="apache">Copyright 2007 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>
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