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+<p class="apache">Apache HTTP Server Version 2.4</p>
+<img alt="" src="../images/feather.png" /></div>
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+<a href="http://www.apache.org/">Apache</a> &gt; <a href="http://httpd.apache.org/">HTTP Server</a> &gt; <a href="http://httpd.apache.org/docs/">Documentation</a> &gt; <a href="../">Version 2.4</a> &gt; <a href="./">Modules</a></div>
+<div id="page-content">
+<div id="preamble"><h1>Apache Module mod_proxy_http</h1>
+<div class="toplang">
+<p><span>Available Languages: </span><a href="../en/mod/mod_proxy_http.html" title="English">&nbsp;en&nbsp;</a> |
+<a href="../fr/mod/mod_proxy_http.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a></p>
+</div>
+<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>HTTP support module for
+<code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></td></tr>
+<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
+<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>proxy_http_module</td></tr>
+<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_proxy_http.c</td></tr></table>
+<h3>Summary</h3>
+
+ <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
+ proxying HTTP and HTTPS requests. <code class="module"><a href="../mod/mod_proxy_http.html">mod_proxy_http</a></code>
+ supports HTTP/0.9, HTTP/1.0 and HTTP/1.1. It does <em>not</em>
+ provide any caching abilities. If you want to set up a caching
+ proxy, you might want to use the additional service of the
+ <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> module.</p>
+
+ <p>Thus, in order to get the ability of handling HTTP proxy requests,
+ <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>
+ have to be present in the server.</p>
+
+ <div class="warning"><h3>Warning</h3>
+ <p>Do not enable proxying until you have <a href="mod_proxy.html#access">secured your server</a>. Open proxy
+ servers are dangerous both to your network and to the Internet at
+ large.</p>
+ </div>
+</div>
+<div id="quickview"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><h3>Topics</h3>
+<ul id="topics">
+<li><img alt="" src="../images/down.gif" /> <a href="#env">Environment Variables</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#notes">Request notes</a></li>
+</ul><h3 class="directives">Directives</h3>
+<p>This module provides no
+ directives.</p>
+<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__&amp;list_id=144532&amp;product=Apache%20httpd-2&amp;query_format=specific&amp;order=changeddate%20DESC%2Cpriority%2Cbug_severity&amp;component=mod_proxy_http">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&amp;component=mod_proxy_http">Report a bug</a></li></ul><h3>See also</h3>
+<ul class="seealso">
+<li><code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></li>
+<li><code class="module"><a href="../mod/mod_proxy_connect.html">mod_proxy_connect</a></code></li>
+<li><a href="#comments_section">Comments</a></li></ul></div>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="env" id="env">Environment Variables</a></h2>
+ <p>In addition to the configuration directives that control the
+ behaviour of <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code>, there are a number of
+ <dfn>environment variables</dfn> that control the HTTP protocol
+ provider. Environment variables below that don't specify specific values
+ are enabled when set to any value.</p>
+ <dl>
+ <dt>proxy-sendextracrlf</dt>
+ <dd>Causes proxy to send an extra CR-LF newline on the end of a
+ request. This is a workaround for a bug in some browsers.</dd>
+ <dt>force-proxy-request-1.0</dt>
+ <dd>Forces the proxy to send requests to the backend as HTTP/1.0
+ and disables HTTP/1.1 features.</dd>
+ <dt>proxy-nokeepalive</dt>
+ <dd>Forces the proxy to close the backend connection after
+ each request.</dd>
+ <dt>proxy-chain-auth</dt>
+ <dd>If the proxy requires authentication, it will read and
+ consume the proxy authentication credentials sent by the client.
+ With <var>proxy-chain-auth</var> it will <em>also</em> forward
+ the credentials to the next proxy in the chain. This may
+ be necessary if you have a chain of proxies that share
+ authentication information. <strong>Security Warning:</strong>
+ Do not set this unless you know you need it, as it forwards
+ sensitive information!</dd>
+ <dt>proxy-sendcl</dt>
+ <dd>HTTP/1.0 required all HTTP requests that include a body
+ (e.g. POST requests) to include a <var>Content-Length</var>
+ header. This environment variable forces the Apache proxy to
+ send this header to the backend server, regardless of what the
+ Client sent to the proxy. It ensures compatibility when
+ proxying for an HTTP/1.0 or unknown backend. However, it
+ may require the entire request to be buffered by the proxy,
+ so it becomes very inefficient for large requests.</dd>
+ <dt>proxy-sendchunks or proxy-sendchunked</dt>
+ <dd>This is the opposite of <var>proxy-sendcl</var>. It allows
+ request bodies to be sent to the backend using chunked transfer
+ encoding. This allows the request to be efficiently streamed,
+ but requires that the backend server supports HTTP/1.1.</dd>
+ <dt>proxy-interim-response</dt>
+ <dd>This variable takes values <code>RFC</code> (the default) or
+ <code>Suppress</code>. Earlier httpd versions would suppress
+ HTTP interim (1xx) responses sent from the backend. This is
+ technically a violation of the HTTP protocol. In practice,
+ if a backend sends an interim response, it may itself be
+ extending the protocol in a manner we know nothing about,
+ or just broken. So this is now configurable: set
+ <code>proxy-interim-response RFC</code> to be fully protocol
+ compliant, or <code>proxy-interim-response Suppress</code>
+ to suppress interim responses.</dd>
+ <dt>proxy-initial-not-pooled</dt>
+ <dd>If this variable is set, no pooled connection will be reused
+ if the client request is the initial request on the frontend connection. This avoids
+ the "proxy: error reading status line from remote server" error message
+ caused by the race condition that the backend server closed the
+ pooled connection after the connection check by the proxy and
+ before data sent by the proxy reached the backend. It has to be
+ kept in mind that setting this variable downgrades performance,
+ especially with HTTP/1.0 clients.
+ </dd>
+ </dl>
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="notes" id="notes">Request notes</a></h2>
+ <p><code class="module"><a href="../mod/mod_proxy_http.html">mod_proxy_http</a></code> creates the following request notes for
+ logging using the <code>%{VARNAME}n</code> format in
+ <code class="directive"><a href="../mod/mod_log_config.html#logformat">LogFormat</a></code> or
+ <code class="directive"><a href="../mod/core.html#errorlogformat">ErrorLogFormat</a></code>:
+ </p>
+ <dl>
+ <dt>proxy-source-port</dt>
+ <dd>The local port used for the connection to the backend server.</dd>
+ <dt>proxy-status</dt>
+ <dd>The HTTP status received from the backend server.</dd>
+ </dl>
+</div>
+</div>
+<div class="bottomlang">
+<p><span>Available Languages: </span><a href="../en/mod/mod_proxy_http.html" title="English">&nbsp;en&nbsp;</a> |
+<a href="../fr/mod/mod_proxy_http.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a></p>
+</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&amp;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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