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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 2.5</p>
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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> |
25 <a href="../fr/mod/mod_proxy_http.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p>
27 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>HTTP support module for
28 <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></td></tr>
29 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
30 <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>proxy_http_module</td></tr>
31 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_proxy_http.c</td></tr></table>
34 <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
35 proxying HTTP and HTTPS requests. <code class="module"><a href="../mod/mod_proxy_http.html">mod_proxy_http</a></code>
36 supports HTTP/0.9, HTTP/1.0 and HTTP/1.1. It does <em>not</em>
37 provide any caching abilities. If you want to set up a caching
38 proxy, you might want to use the additional service of the
39 <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> module.</p>
41 <p>Thus, in order to get the ability of handling HTTP proxy requests,
42 <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>
43 have to be present in the server.</p>
45 <div class="warning"><h3>Warning</h3>
46 <p>Do not enable proxying until you have <a href="mod_proxy.html#access">secured your server</a>. Open proxy
47 servers are dangerous both to your network and to the Internet at
51 <div id="quickview"><h3 class="directives">Directives</h3>
52 <p>This module provides no
56 <li><img alt="" src="../images/down.gif" /> <a href="#env">Environment Variables</a></li>
57 <li><img alt="" src="../images/down.gif" /> <a href="#notes">Request notes</a></li>
58 </ul><h3>See also</h3>
60 <li><code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></li>
61 <li><code class="module"><a href="../mod/mod_proxy_connect.html">mod_proxy_connect</a></code></li>
63 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
65 <h2><a name="env" id="env">Environment Variables</a></h2>
66 <p>In addition to the configuration directives that control the
67 behaviour of <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code>, there are a number of
68 <dfn>environment variables</dfn> that control the HTTP protocol
71 <dt>proxy-sendextracrlf</dt>
72 <dd>Causes proxy to send an extra CR-LF newline on the end of a
73 request. This is a workaround for a bug in some browsers.</dd>
74 <dt>force-proxy-request-1.0</dt>
75 <dd>Forces the proxy to send requests to the backend as HTTP/1.0
76 and disables HTTP/1.1 features.</dd>
77 <dt>proxy-nokeepalive</dt>
78 <dd>Forces the proxy to close the backend connection after
80 <dt>proxy-chain-auth</dt>
81 <dd>If the proxy requires authentication, it will read and
82 consume the proxy authentication credentials sent by the client.
83 With <var>proxy-chain-auth</var> it will <em>also</em> forward
84 the credentials to the next proxy in the chain. This may
85 be necessary if you have a chain of proxies that share
86 authentication information. <strong>Security Warning:</strong>
87 Do not set this unless you know you need it, as it forwards
88 sensitive information!</dd>
90 <dd>HTTP/1.0 required all HTTP requests that include a body
91 (e.g. POST requests) to include a <var>Content-Length</var>
92 header. This environment variable forces the Apache proxy to
93 send this header to the backend server, regardless of what the
94 Client sent to the proxy. It ensures compatibility when
95 proxying for an HTTP/1.0 or unknown backend. However, it
96 may require the entire request to be buffered by the proxy,
97 so it becomes very inefficient for large requests.</dd>
98 <dt>proxy-sendchunks or proxy-sendchunked</dt>
99 <dd>This is the opposite of <var>proxy-sendcl</var>. It allows
100 request bodies to be sent to the backend using chunked transfer
101 encoding. This allows the request to be efficiently streamed,
102 but requires that the backend server supports HTTP/1.1.</dd>
103 <dt>proxy-interim-response</dt>
104 <dd>This variable takes values <code>RFC</code> (the default) or
105 <code>Suppress</code>. Earlier httpd versions would suppress
106 HTTP interim (1xx) responses sent from the backend. This is
107 technically a violation of the HTTP protocol. In practice,
108 if a backend sends an interim response, it may itself be
109 extending the protocol in a manner we know nothing about,
110 or just broken. So this is now configurable: set
111 <code>proxy-interim-response RFC</code> to be fully protocol
112 compliant, or <code>proxy-interim-response Suppress</code>
113 to suppress interim responses.</dd>
114 <dt>proxy-initial-not-pooled</dt>
115 <dd>If this variable is set no pooled connection will be reused
116 if the client connection is an initial connection. This avoids
117 the "proxy: error reading status line from remote server" error message
118 caused by the race condition that the backend server closed the
119 pooled connection after the connection check by the proxy and
120 before data sent by the proxy reached the backend. It has to be
121 kept in mind that setting this variable downgrades performance,
122 especially with HTTP/1.0 clients.
125 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
126 <div class="section">
127 <h2><a name="notes" id="notes">Request notes</a></h2>
128 <p><code class="module"><a href="../mod/mod_proxy_http.html">mod_proxy_http</a></code> creates the following request notes for
129 logging using the <code>%{VARNAME}n</code> format in
130 <code class="directive"><a href="../mod/mod_log_config.html#logformat">LogFormat</a></code> or
131 <code class="directive"><a href="../mod/core.html#errorlogformat">ErrorLogFormat</a></code>:
134 <dt>proxy-source-port</dt>
135 <dd>The local port used for the connection to the backend server.</dd>
136 <dt>proxy-status</dt>
137 <dd>The HTTP status received from the backend server.</dd>
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142 <p><span>Available Languages: </span><a href="../en/mod/mod_proxy_http.html" title="English"> en </a> |
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145 <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>
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