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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<meta content="text/html; charset=UTF-8" http-equiv="Content-Type" />
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<title>mod_proxy_http - Apache HTTP Server Version 2.5</title>
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<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
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</script>
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<link href="../images/favicon.ico" rel="shortcut icon" /></head>
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<body>
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<div id="page-header">
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<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>
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<p class="apache">Apache HTTP Server Version 2.5</p>
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<img alt="" src="../images/feather.png" /></div>
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<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div>
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<div id="path">
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<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>
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<div id="page-content">
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<div id="preamble"><h1>Apache Module mod_proxy_http</h1>
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<div class="toplang">
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<p><span>Available Languages: </span><a href="../en/mod/mod_proxy_http.html" title="English"> en </a> |
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<a href="../fr/mod/mod_proxy_http.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p>
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</div>
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>HTTP support module for
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<code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></td></tr>
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<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
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<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>proxy_http_module</td></tr>
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<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_proxy_http.c</td></tr></table>
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<h3>Summary</h3>
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<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
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proxying HTTP and HTTPS requests. <code class="module"><a href="../mod/mod_proxy_http.html">mod_proxy_http</a></code>
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supports HTTP/0.9, HTTP/1.0 and HTTP/1.1. It does <em>not</em>
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provide any caching abilities. If you want to set up a caching
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proxy, you might want to use the additional service of the
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<code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> module.</p>
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<p>Thus, in order to get the ability of handling HTTP proxy requests,
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<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>
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have to be present in the server.</p>
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<div class="warning"><h3>Warning</h3>
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<p>Do not enable proxying until you have <a href="mod_proxy.html#access">secured your server</a>. Open proxy
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servers are dangerous both to your network and to the Internet at
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large.</p>
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</div>
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</div>
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<div id="quickview"><h3>Topics</h3>
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<ul id="topics">
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<li><img alt="" src="../images/down.gif" /> <a href="#env">Environment Variables</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#notes">Request notes</a></li>
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</ul><h3 class="directives">Directives</h3>
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<p>This module provides no
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directives.</p>
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<h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_proxy_http">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_proxy_http">Report a bug</a></li></ul><h3>See also</h3>
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<ul class="seealso">
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<li><code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></li>
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<li><code class="module"><a href="../mod/mod_proxy_connect.html">mod_proxy_connect</a></code></li>
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<li><a href="#comments_section">Comments</a></li></ul></div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="env" id="env">Environment Variables</a> <a title="Permanent link" href="#env" class="permalink">¶</a></h2>
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<p>In addition to the configuration directives that control the
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behaviour of <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code>, there are a number of
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<dfn>environment variables</dfn> that control the HTTP protocol
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provider. Environment variables below that don't specify specific values
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are enabled when set to any value.</p>
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<dl>
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<dt>proxy-sendextracrlf</dt>
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<dd>Causes proxy to send an extra CR-LF newline on the end of a
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request. This is a workaround for a bug in some browsers.</dd>
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<dt>force-proxy-request-1.0</dt>
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<dd>Forces the proxy to send requests to the backend as HTTP/1.0
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and disables HTTP/1.1 features.</dd>
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<dt>proxy-nokeepalive</dt>
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<dd>Forces the proxy to close the backend connection after
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each request.</dd>
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<dt>proxy-chain-auth</dt>
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<dd>If the proxy requires authentication, it will read and
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consume the proxy authentication credentials sent by the client.
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With <var>proxy-chain-auth</var> it will <em>also</em> forward
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the credentials to the next proxy in the chain. This may
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be necessary if you have a chain of proxies that share
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authentication information. <strong>Security Warning:</strong>
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Do not set this unless you know you need it, as it forwards
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sensitive information!</dd>
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<dt>proxy-sendcl</dt>
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<dd>HTTP/1.0 required all HTTP requests that include a body
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(e.g. POST requests) to include a <var>Content-Length</var>
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header. This environment variable forces the Apache proxy to
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send this header to the backend server, regardless of what the
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Client sent to the proxy. It ensures compatibility when
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proxying for an HTTP/1.0 or unknown backend. However, it
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may require the entire request to be buffered by the proxy,
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so it becomes very inefficient for large requests.</dd>
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<dt>proxy-sendchunks or proxy-sendchunked</dt>
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<dd>This is the opposite of <var>proxy-sendcl</var>. It allows
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request bodies to be sent to the backend using chunked transfer
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encoding. This allows the request to be efficiently streamed,
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but requires that the backend server supports HTTP/1.1.</dd>
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<dt>proxy-interim-response</dt>
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<dd>This variable takes values <code>RFC</code> (the default) or
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<code>Suppress</code>. Earlier httpd versions would suppress
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HTTP interim (1xx) responses sent from the backend. This is
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technically a violation of the HTTP protocol. In practice,
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if a backend sends an interim response, it may itself be
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extending the protocol in a manner we know nothing about,
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or just broken. So this is now configurable: set
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<code>proxy-interim-response RFC</code> to be fully protocol
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compliant, or <code>proxy-interim-response Suppress</code>
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to suppress interim responses.</dd>
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<dt>proxy-initial-not-pooled</dt>
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<dd>If this variable is set, no pooled connection will be reused
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if the client request is the initial request on the frontend connection. This avoids
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the "proxy: error reading status line from remote server" error message
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caused by the race condition that the backend server closed the
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pooled connection after the connection check by the proxy and
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before data sent by the proxy reached the backend. It has to be
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kept in mind that setting this variable downgrades performance,
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especially with HTTP/1.0 clients.
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</dd>
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</dl>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="notes" id="notes">Request notes</a> <a title="Permanent link" href="#notes" class="permalink">¶</a></h2>
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<p><code class="module"><a href="../mod/mod_proxy_http.html">mod_proxy_http</a></code> creates the following request notes for
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logging using the <code>%{VARNAME}n</code> format in
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<code class="directive"><a href="../mod/mod_log_config.html#logformat">LogFormat</a></code> or
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<code class="directive"><a href="../mod/core.html#errorlogformat">ErrorLogFormat</a></code>:
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</p>
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<dl>
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<dt>proxy-source-port</dt>
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<dd>The local port used for the connection to the backend server.</dd>
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<dt>proxy-status</dt>
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<dd>The HTTP status received from the backend server.</dd>
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</dl>
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</div>
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</div>
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<div class="bottomlang">
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<p><span>Available Languages: </span><a href="../en/mod/mod_proxy_http.html" title="English"> en </a> |
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<a href="../fr/mod/mod_proxy_http.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p>
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</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 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 Libera.chat, or sent to our <a href="https://httpd.apache.org/lists.html">mailing lists</a>.</div>
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