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<div id="preamble"><h1>Apache Module mod_proxy_fcgi</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="../en/mod/mod_proxy_fcgi.html" title="English"> en </a></p>
</div>
<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>FastCGI 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_fcgi_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_proxy_fcgi.c</td></tr>
<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available 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
<a href="http://www.fastcgi.com/">FastCGI</a> protocol.</p>
<p>Thus, in order to get the ability of handling the <code>FastCGI</code>
protocol, <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code> and
<code class="module"><a href="../mod/mod_proxy_fcgi.html">mod_proxy_fcgi</a></code> have to be present in the server.</p>
<p>Unlike <a href="http://httpd.apache.org/mod_fcgid/">mod_fcgid</a>
and <a href="http://www.fastcgi.com/">mod_fastcgi</a>,
<code class="module"><a href="../mod/mod_proxy_fcgi.html">mod_proxy_fcgi</a></code> has no provision for starting the
application process; <code class="program"><a href="../programs/fcgistarter.html">fcgistarter</a></code> is provided for
that purpose.</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>
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<div id="quickview"><h3 class="directives">Directives</h3>
<p>This module provides no
directives.</p>
<h3>Topics</h3>
<ul id="topics">
<li><img alt="" src="../images/down.gif" /> <a href="#examples">Examples</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#env">Environment Variables</a></li>
</ul><h3>See also</h3>
<ul class="seealso">
<li><code class="program"><a href="../programs/fcgistarter.html">fcgistarter</a></code></li>
<li><code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></li>
</ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
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<div class="section">
<h2><a name="examples" id="examples">Examples</a></h2>
<p>Remember, in order to make the following examples work, you have to
enable <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code> and <code class="module"><a href="../mod/mod_proxy_fcgi.html">mod_proxy_fcgi</a></code>.</p>
<div class="example"><h3>Single application instance</h3><pre class="prettyprint lang-config">
ProxyPass /myapp/ fcgi://localhost:4000/
</pre>
</div>
<p>This application should be able to handle multiple concurrent
connections. <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code> enables connection reuse by
default, so after a request has been completed the connection will be
held open by that httpd child process and won't be reused until that
httpd process routes another request to the application. If the
FastCGI application is unable to handle enough concurrent connections
from httpd, requests can block waiting for the application to close
an existing connection. One way to resolve this is to disable connection
reuse on the <code class="directive">ProxyPass</code> directive, as shown in
the following example:</p>
<div class="example"><h3>Single application instance, no connection reuse</h3><pre class="prettyprint lang-config">
ProxyPass /myapp/ fcgi://localhost:4000/ disablereuse=on
</pre>
</div>
<p>The balanced gateway needs <code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code> and
at least one load balancer algorithm module, such as
<code class="module"><a href="../mod/mod_lbmethod_byrequests.html">mod_lbmethod_byrequests</a></code>, in addition to the proxy
modules listed above. <code class="module"><a href="../mod/mod_lbmethod_byrequests.html">mod_lbmethod_byrequests</a></code> is the
default, and will be used for this example configuration.</p>
<div class="example"><h3>Balanced gateway to multiple application instances</h3><pre class="prettyprint lang-config">
ProxyPass /myapp/ balancer://myappcluster/
<Proxy balancer://myappcluster/>
BalancerMember fcgi://localhost:4000
BalancerMember fcgi://localhost:4001
</Proxy>
</pre>
</div>
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<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 FCGI protocol
provider:</p>
<dl>
<dt>proxy-fcgi-pathinfo</dt>
<dd>By default <code class="module"><a href="../mod/mod_proxy_fcgi.html">mod_proxy_fcgi</a></code> will neither create
nor export the <var>PATH_INFO</var> environment variable. This allows
the backend FCGI server to correctly determine <var>SCRIPT_NAME</var>
and <var>Script-URI</var> and be compliant with RFC 3875 section 3.3.
If instead you need <code class="module"><a href="../mod/mod_proxy_fcgi.html">mod_proxy_fcgi</a></code> to generate
a "best guess" for <var>PATH_INFO</var>, set this env-var.
This is a workaround for a bug in some FCGI implementations.</dd>
</dl>
</div>
</div>
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