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+<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.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>
+<p class="apache">Apache HTTP Server Version 2.4</p>
+<img alt="" src="../images/feather.png" /></div>
+<div class="up"><a href="./"><img title="&lt;-" alt="&lt;-" src="../images/left.gif" /></a></div>
+<div id="path">
+<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_fcgi</h1>
+<div class="toplang">
+<p><span>Available Languages: </span><a href="../en/mod/mod_proxy_fcgi.html" title="English">&nbsp;en&nbsp;</a> |
+<a href="../fr/mod/mod_proxy_fcgi.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>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
+ (on some platforms) for that purpose. Alternatively, external launching
+ or process management may be available in the FastCGI application
+ framework in use.</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="#examples">Examples</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#env">Environment Variables</a></li>
+</ul><h3 class="directives">Directives</h3>
+<ul id="toc">
+<li><img alt="" src="../images/down.gif" /> <a href="#proxyfcgibackendtype">ProxyFCGIBackendType</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#proxyfcgisetenvif">ProxyFCGISetEnvIf</a></li>
+</ul>
+<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_fcgi">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&amp;component=mod_proxy_fcgi">Report a bug</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>
+<li><code class="module"><a href="../mod/mod_authnz_fcgi.html">mod_authnz_fcgi</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="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> <code class="module"><a href="../mod/mod_proxy_fcgi.html">mod_proxy_fcgi</a></code> disables connection reuse by
+ default, so after a request has been completed the connection will NOT be
+ held open by that httpd child process and won't be reused. If the
+ FastCGI application is able to handle concurrent connections
+ from httpd, you can opt-in to connection reuse as shown in the following
+ example:</p>
+
+ <div class="example"><h3>Single application instance, connection reuse (2.4.11 and later)</h3><pre class="prettyprint lang-config">ProxyPass "/myapp/" "fcgi://localhost:4000/" enablereuse=on</pre>
+</div>
+
+ <div class="note"><h3>Enable connection reuse to a FCGI backend like PHP-FPM</h3>
+ <p>Please keep in mind that PHP-FPM (at the time of writing, February 2018)
+ uses a prefork model, namely each of its worker processes can handle one
+ connection at the time.<br />
+ By default mod_proxy (configured with <code>enablereuse=on</code>)
+ allows a connection pool of
+ <code class="directive"><a href="../mod/mpm_common.html#threadsperchild">ThreadsPerChild</a></code> connections to the
+ backend for each httpd process when using a threaded mpm (like
+ <code class="module"><a href="../mod/worker.html">worker</a></code> or <code class="module"><a href="../mod/event.html">event</a></code>),
+ so the following use cases should be taken into account:</p>
+ <ul>
+ <li>Under HTTP/1.1 load it will likely cause the creation of up to
+ <code class="directive"><a href="../mod/mpm_common.html#maxrequestworkers">MaxRequestWorkers</a></code>
+ connections to the FCGI backend.</li>
+ <li>Under HTTP/2 load, due to how <code class="module"><a href="../mod/mod_http2.html">mod_http2</a></code> is implemented,
+ there are additional h2 worker threads that may force the creation of other
+ backend connections. The overall count of connections in the pools may raise
+ to more than <code class="directive"><a href="../mod/mpm_common.html#maxrequestworkers">MaxRequestWorkers</a></code>.</li>
+ </ul>
+ <p>The maximum number of PHP-FPM worker processes needs to be configured wisely,
+ since there is the chance that they will all end up "busy" handling idle
+ persistent connections, without any room for new ones to be established,
+ and the end user experience will be a pile of HTTP request timeouts.</p>
+ </div>
+
+ <p> The following example passes the request URI as a filesystem
+ path for the PHP-FPM daemon to run. The request URL is implicitly added
+ to the 2nd parameter. The hostname and port following fcgi:// are where
+ PHP-FPM is listening. Connection pooling/reuse is enabled.</p>
+ <div class="example"><h3>PHP-FPM</h3><pre class="prettyprint lang-config">ProxyPassMatch "^/myapp/.*\.php(/.*)?$" "fcgi://localhost:9000/var/www/" enablereuse=on</pre>
+</div>
+
+ <p> The following example passes the request URI as a filesystem
+ path for the PHP-FPM daemon to run. In this case, PHP-FPM is listening on
+ a unix domain socket (UDS). Requires 2.4.9 or later. With this syntax,
+ the hostname and optional port following fcgi:// are ignored.</p>
+ <div class="example"><h3>PHP-FPM with UDS</h3><pre class="prettyprint lang-config">ProxyPassMatch "^/(.*\.php(/.*)?)$" "unix:/var/run/php5-fpm.sock|fcgi://localhost/var/www/"</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/"
+&lt;Proxy "balancer://myappcluster/"&gt;
+ BalancerMember "fcgi://localhost:4000"
+ BalancerMember "fcgi://localhost:4001"
+&lt;/Proxy&gt;</pre>
+</div>
+
+ <p>You can also force a request to be handled as a reverse-proxy
+ request, by creating a suitable Handler pass-through. The example
+ configuration below will pass all requests for PHP scripts to the
+ specified FastCGI server using reverse proxy.
+ This feature is available in Apache HTTP Server 2.4.10 and later. For performance
+ reasons, you will want to define a <a href="mod_proxy.html#workers">worker</a>
+ representing the same fcgi:// backend. The benefit of this form is that it
+ allows the normal mapping of URI to filename to occur in the server, and the
+ local filesystem result is passed to the backend. When FastCGI is
+ configured this way, the server can calculate the most accurate
+ PATH_INFO.
+ </p>
+ <div class="example"><h3>Proxy via Handler</h3><pre class="prettyprint lang-config">&lt;FilesMatch "\.php$"&gt;
+ # Note: The only part that varies is /path/to/app.sock
+ SetHandler "proxy:unix:/path/to/app.sock|fcgi://localhost/"
+&lt;/FilesMatch&gt;
+
+# Define a matching worker.
+# The part that is matched to the SetHandler is the part that
+# follows the pipe. If you need to distinguish, "localhost; can
+# be anything unique.
+&lt;Proxy "fcgi://localhost/" enablereuse=on max=10&gt;
+&lt;/Proxy&gt;
+
+&lt;FilesMatch ...&gt;
+ SetHandler "proxy:fcgi://localhost:9000"
+&lt;/FilesMatch&gt;
+
+&lt;FilesMatch ...&gt;
+ SetHandler "proxy:balancer://myappcluster/"
+&lt;/FilesMatch&gt;</pre>
+</div>
+</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 FCGI protocol
+ provider:</p>
+ <dl>
+ <dt>proxy-fcgi-pathinfo</dt>
+ <dd>When configured via <code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code> or <code class="directive"><a href="../mod/mod_proxy.html#proxypassmatch">ProxyPassMatch</a></code>, <code class="module"><a href="../mod/mod_proxy_fcgi.html">mod_proxy_fcgi</a></code> will not
+ set 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. This
+ variable can be set to multiple values to tweak at how the best guess
+ is chosen (In 2.4.11 and later only):
+ <dl>
+ <dt>first-dot</dt>
+ <dd>PATH_INFO is split from the slash following the
+ <em>first</em> "." in the URL.</dd>
+ <dt>last-dot</dt>
+ <dd>PATH_INFO is split from the slash following the
+ <em>last</em> "." in the URL.</dd>
+ <dt>full</dt>
+ <dd>PATH_INFO is calculated by an attempt to map the URL to the
+ local filesystem.</dd>
+ <dt>unescape</dt>
+ <dd>PATH_INFO is the path component of the URL, unescaped /
+ decoded.</dd>
+ <dt>any other value</dt>
+ <dd>PATH_INFO is the same as the path component of the URL.
+ Originally, this was the only proxy-fcgi-pathinfo option.</dd>
+ </dl>
+ </dd>
+ </dl>
+</div>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="directive-section"><h2><a name="ProxyFCGIBackendType" id="ProxyFCGIBackendType">ProxyFCGIBackendType</a> <a name="proxyfcgibackendtype" id="proxyfcgibackendtype">Directive</a></h2>
+<table class="directive">
+<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Specify the type of backend FastCGI application</td></tr>
+<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyFCGIBackendType FPM|GENERIC</code></td></tr>
+<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ProxyFCGIBackendType FPM</code></td></tr>
+<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
+<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
+<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy_fcgi</td></tr>
+<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in version 2.4.26 and later</td></tr>
+</table>
+<p>This directive allows the type of backend FastCGI application to be
+specified. Some FastCGI servers, such as PHP-FPM, use historical quirks of
+environment variables to identify the type of proxy server being used. Set
+this directive to "GENERIC" if your non PHP-FPM application has trouble
+interpreting environment variables such as SCRIPT_FILENAME or PATH_TRANSLATED
+as set by the server.</p>
+
+<p>One example of values that change based on the setting of this directive is
+SCRIPT_FILENAME. When using <code class="module"><a href="../mod/mod_proxy_fcgi.html">mod_proxy_fcgi</a></code> historically,
+SCRIPT_FILENAME was prefixed with the string "proxy:fcgi://". This variable is
+what some generic FastCGI applications would read as their script input, but
+PHP-FPM would strip the prefix then remember it was talking to Apache. In
+2.4.21 through 2.4.25, this prefix was automatically stripped by the server,
+breaking the ability of PHP-FPM to detect and interoperate with Apache in some
+scenarios.</p>
+
+</div>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="directive-section"><h2><a name="ProxyFCGISetEnvIf" id="ProxyFCGISetEnvIf">ProxyFCGISetEnvIf</a> <a name="proxyfcgisetenvif" id="proxyfcgisetenvif">Directive</a></h2>
+<table class="directive">
+<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Allow variables sent to FastCGI servers to be fixed up</td></tr>
+<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyFCGISetEnvIf <var>conditional-expression</var>
+ [!]<var>environment-variable-name</var>
+ [<var>value-expression</var>]</code></td></tr>
+<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
+<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
+<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy_fcgi</td></tr>
+<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in version 2.4.26 and later</td></tr>
+</table>
+<p>Just before passing a request to the configured FastCGI server, the core of
+the web server sets a number of environment variables based on details of the
+current request. FastCGI programs often uses these environment variables
+as inputs that determine what underlying scripts they will process, or what
+output they directly produce.</p>
+<p>Examples of noteworthy environment variables are:</p>
+<ul>
+ <li>SCRIPT_NAME</li>
+ <li>SCRIPT_FILENAME</li>
+ <li>REQUEST_URI</li>
+ <li>PATH_INFO</li>
+ <li>PATH_TRANSLATED</li>
+</ul>
+
+<p>This directive allows the environment variables above, or any others of
+interest, to be overridden. This directive is evaluated after the initial
+values for these variables are set, so they can be used as input into both
+the condition expressions and value expressions.</p>
+<p>Parameter syntax:</p>
+<dl>
+<dt>conditional-expression</dt>
+<dd>Specifies an expression that controls whether the environment variable that
+ follows will be modified. For information on the expression syntax, see
+ the examples that follow or the full specification at the
+ <a href="../expr.html">ap_expr</a> documentation.
+ </dd>
+<dt>environment-variable-name</dt>
+<dd> Specifies the CGI environment variable to change,
+ such as PATH_INFO. If preceded by an exclamation point, the variable
+ will be unset.</dd>
+<dt>value-expression</dt>
+<dd>Specifies the replacement value for the preceding environment variable.
+ Backreferences, such as "$1", can be included from regular expression
+ captures in <var>conditional-expression</var>. If omitted, the variable is
+ set (or overridden) to an empty string — but see the Note below.</dd>
+</dl>
+
+<div class="example"><pre class="prettyprint lang-config"># A basic, unconditional override
+ProxyFCGISetEnvIf "true" PATH_INFO "/example"
+
+# Use an environment variable in the value
+ProxyFCGISetEnvIf "true" PATH_INFO "%{reqenv:SCRIPT_NAME}"
+
+# Use captures in the conditions and backreferences in the replacement
+ProxyFCGISetEnvIf "reqenv('PATH_TRANSLATED') =~ m|(/.*prefix)(\d+)(.*)|" PATH_TRANSLATED "$1$3"</pre>
+</div>
+
+<div class="note"><h3>Note: Unset vs. Empty</h3>
+ The following will unset <code>VARIABLE</code>, preventing it from being sent
+ to the FastCGI server:
+
+ <pre class="prettyprint lang-config">ProxyFCGISetEnvIf true !VARIABLE</pre>
+
+
+ Whereas the following will erase any existing <em>value</em> of
+ <code>VARIABLE</code> (by setting it to the empty string), but the empty
+ <code>VARIABLE</code> will still be sent to the server:
+
+ <pre class="prettyprint lang-config">ProxyFCGISetEnvIf true VARIABLE</pre>
+
+
+ The CGI/1.1 specification
+ <a href="https://tools.ietf.org/html/rfc3875#section-4.1">does not
+ distinguish</a> between a variable with an empty value and a variable that
+ does not exist. However, many CGI and FastCGI implementations distinguish (or
+ allow scripts to distinguish) between the two. The choice of which to use is
+ dependent upon your implementation and your reason for modifying the variable.
+</div>
+
+
+</div>
+</div>
+<div class="bottomlang">
+<p><span>Available Languages: </span><a href="../en/mod/mod_proxy_fcgi.html" title="English">&nbsp;en&nbsp;</a> |
+<a href="../fr/mod/mod_proxy_fcgi.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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