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25 <div id="preamble"><h1>Apache Module mod_proxy_fcgi</h1>
27 <p><span>Available Languages: </span><a href="../en/mod/mod_proxy_fcgi.html" title="English"> en </a></p>
29 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>FastCGI support module for
30 <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></td></tr>
31 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
32 <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>proxy_fcgi_module</td></tr>
33 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_proxy_fcgi.c</td></tr>
34 <tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in version 2.3 and later</td></tr></table>
37 <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
38 <a href="http://www.fastcgi.com/">FastCGI</a> protocol.</p>
40 <p>Thus, in order to get the ability of handling the <code>FastCGI</code>
41 protocol, <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code> and
42 <code class="module"><a href="../mod/mod_proxy_fcgi.html">mod_proxy_fcgi</a></code> have to be present in the server.</p>
44 <p>Unlike <a href="http://httpd.apache.org/mod_fcgid/">mod_fcgid</a>
45 and <a href="http://www.fastcgi.com/">mod_fastcgi</a>,
46 <code class="module"><a href="../mod/mod_proxy_fcgi.html">mod_proxy_fcgi</a></code> has no provision for starting the
47 application process; <code class="program"><a href="../programs/fcgistarter.html">fcgistarter</a></code> is provided
48 (on some platforms) for that purpose. Alternatively, external launching
49 or process management may be available in the FastCGI application
52 <div class="warning"><h3>Warning</h3>
53 <p>Do not enable proxying until you have <a href="mod_proxy.html#access">secured your server</a>. Open proxy
54 servers are dangerous both to your network and to the Internet at
58 <div id="quickview"><h3 class="directives">Directives</h3>
59 <p>This module provides no
63 <li><img alt="" src="../images/down.gif" /> <a href="#examples">Examples</a></li>
64 <li><img alt="" src="../images/down.gif" /> <a href="#env">Environment Variables</a></li>
65 </ul><h3>See also</h3>
67 <li><code class="program"><a href="../programs/fcgistarter.html">fcgistarter</a></code></li>
68 <li><code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></li>
69 </ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
70 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
72 <h2><a name="examples" id="examples">Examples</a></h2>
73 <p>Remember, in order to make the following examples work, you have to
74 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>
76 <div class="example"><h3>Single application instance</h3><pre class="prettyprint lang-config">
77 ProxyPass /myapp/ fcgi://localhost:4000/
81 <p>This application should be able to handle multiple concurrent
82 connections. <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code> enables connection reuse by
83 default, so after a request has been completed the connection will be
84 held open by that httpd child process and won't be reused until that
85 httpd process routes another request to the application. If the
86 FastCGI application is unable to handle enough concurrent connections
87 from httpd, requests can block waiting for the application to close
88 an existing connection. One way to resolve this is to disable connection
89 reuse on the <code class="directive">ProxyPass</code> directive, as shown in
90 the following example:</p>
92 <div class="example"><h3>Single application instance, no connection reuse</h3><pre class="prettyprint lang-config">
93 ProxyPass /myapp/ fcgi://localhost:4000/ disablereuse=on
97 <p>The balanced gateway needs <code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code> and
98 at least one load balancer algorithm module, such as
99 <code class="module"><a href="../mod/mod_lbmethod_byrequests.html">mod_lbmethod_byrequests</a></code>, in addition to the proxy
100 modules listed above. <code class="module"><a href="../mod/mod_lbmethod_byrequests.html">mod_lbmethod_byrequests</a></code> is the
101 default, and will be used for this example configuration.</p>
103 <div class="example"><h3>Balanced gateway to multiple application instances</h3><pre class="prettyprint lang-config">
104 ProxyPass /myapp/ balancer://myappcluster/
105 <Proxy balancer://myappcluster/>
106 BalancerMember fcgi://localhost:4000
107 BalancerMember fcgi://localhost:4001
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112 <div class="section">
113 <h2><a name="env" id="env">Environment Variables</a></h2>
114 <p>In addition to the configuration directives that control the
115 behaviour of <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code>, there are a number of
116 <dfn>environment variables</dfn> that control the FCGI protocol
119 <dt>proxy-fcgi-pathinfo</dt>
120 <dd>By default <code class="module"><a href="../mod/mod_proxy_fcgi.html">mod_proxy_fcgi</a></code> will neither create
121 nor export the <var>PATH_INFO</var> environment variable. This allows
122 the backend FCGI server to correctly determine <var>SCRIPT_NAME</var>
123 and <var>Script-URI</var> and be compliant with RFC 3875 section 3.3.
124 If instead you need <code class="module"><a href="../mod/mod_proxy_fcgi.html">mod_proxy_fcgi</a></code> to generate
125 a "best guess" for <var>PATH_INFO</var>, set this env-var.
126 This is a workaround for a bug in some FCGI implementations.</dd>
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131 <p><span>Available Languages: </span><a href="../en/mod/mod_proxy_fcgi.html" title="English"> en </a></p>
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