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<title>mod_proxy_fdpass - Apache HTTP Server</title>
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<div id="preamble"><h1>Apache Module mod_proxy_fdpass</h1>
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>fdpass external process 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_fdpass_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source�File:</a></th><td>mod_proxy_fdpass.c</td></tr>
<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available for unix in version 2.3 and later</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 support for the passing the socket of the
client to another process.</p>
<p><code>mod_proxy_fdpass</code> uses the ability of AF_UNIX domain
sockets to <a href="http://www.freebsd.org/cgi/man.cgi?query=recv">pass an
open file descriptor</a> to allow another process to finish handling a request.
</p>
<p>The module has a <code>proxy_fdpass_flusher</code> provider interface,
which allows another module to optionally send the response headers, or even
the start of the response body. The default flush provider disables keep-alive,
and sends the response headers, letting the external process just send a
response body.</p>
<p>At this time the only data passed to the external process is the client
socket. To receive a client socket, call recvfrom with an allocated
<a href="http://www.kernel.org/doc/man-pages/online/pages/man3/cmsg.3.html"><code>struct cmsghdr</code></a>. Future versions of this module may include
more data after the client socket, but this is not implemented at this time.
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<div id="quickview"><h3 class="directives">Directives</h3>
<p>This module provides no
directives.</p>
<h3>See also</h3>
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<li><code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></li>
</ul></div>
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