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| <div id="preamble"><h1>Apache Module mod_proxy_fcgi</h1> | |
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| <p><span>Available Languages: </span><a href="../en/mod/mod_proxy_fcgi.html" title="English"> en </a> | | |
| <a href="../fr/mod/mod_proxy_fcgi.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p> | |
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| <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="https://fastcgi-archives.github.io/">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>, | |
| <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"><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__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_proxy_fcgi">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&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> | |
| </ul></div> | |
| <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif"></a></div> | |
| <div class="section"> | |
| <h2 id="examples">Examples <a title="Permanent link" href="#examples" class="permalink">¶</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 following example forces the module to flush every chunk of data received | |
| from the FCGI backend as soon as it receives it, without buffering.</p> | |
| <div class="example"><h3>Force flush of FCGI data without buffering</h3><pre class="prettyprint lang-config">ProxyPassMatch "^/myapp/.*\.php(/.*)?$" "fcgi://localhost:9000/var/www/" enablereuse=on flushpackets=on</pre> | |
| </div> | |
| <p> The following example is related to the previous one with a difference: the module waits/polls | |
| for a fixed amount of time before flushing (buffering data from the FCGI backend). | |
| This method is useful when the FCGI backend emits data in short bursts, since | |
| forcing a flush would result inefficient and expensive for performances. Please note | |
| that this setting might not be the best one in use cases when outgoing data chunks | |
| from the FCGI application are blocked waiting on incoming chunks from the client. | |
| </p> | |
| <div class="example"><h3>Force flush of FCGI data buffering for 20ms</h3><pre class="prettyprint lang-config">ProxyPassMatch "^/myapp/.*\.php(/.*)?$" "fcgi://localhost:9000/var/www/" flushpackets=on flushwait=20</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> | |
| <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 | |
| <a class="glossarylink" href="../glossary.html#pathinfo" title="see glossary">PATH_INFO</a>. | |
| </p> | |
| <div class="example"><h3>Proxy via Handler</h3><pre class="prettyprint lang-config"><FilesMatch "\.php$"> | |
| # Note: The only part that varies is /path/to/app.sock | |
| SetHandler "proxy:unix:/path/to/app.sock|fcgi://localhost/" | |
| </FilesMatch> | |
| # 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. | |
| <Proxy "fcgi://localhost/" enablereuse=on max=10> | |
| </Proxy> | |
| <FilesMatch ...> | |
| SetHandler "proxy:fcgi://localhost:9000" | |
| </FilesMatch> | |
| <FilesMatch ...> | |
| SetHandler "proxy:balancer://myappcluster/" | |
| </FilesMatch></pre> | |
| </div> | |
| </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif"></a></div> | |
| <div class="section"> | |
| <h2 id="env">Environment Variables <a title="Permanent link" href="#env" class="permalink">¶</a></h2> | |
| <p>In addition to the configuration directives that control the | |
| behavior 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 id="proxyfcgibackendtype"><span id="ProxyFCGIBackendType">ProxyFCGIBackendType</span> Directive <a title="Permanent link" href="#proxyfcgibackendtype" class="permalink">¶</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#Override">Override:</a></th><td>FileInfo</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 id="proxyfcgisetenvif"><span id="ProxyFCGISetEnvIf">ProxyFCGISetEnvIf</span> Directive <a title="Permanent link" href="#proxyfcgisetenvif" class="permalink">¶</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#Override">Override:</a></th><td>FileInfo</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 | |
| does not distinguish (<a href="https://www.rfc-editor.org/rfc/rfc3875#section-4.1">RFC 3875</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"> en </a> | | |
| <a href="../fr/mod/mod_proxy_fcgi.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p> | |
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