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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 06:33:50 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 06:33:50 +0000 |
| commit | fe39ffb8b90ae4e002ed73fe98617cd590abb467 (patch) | |
| tree | b80e5956907d8aeaaffe4e4f0c068c0e6157ce8b /docs/manual/mod/mod_proxy_fcgi.html.en | |
| parent | Initial commit. (diff) | |
| download | apache2-fe39ffb8b90ae4e002ed73fe98617cd590abb467.tar.xz apache2-fe39ffb8b90ae4e002ed73fe98617cd590abb467.zip | |
Adding upstream version 2.4.56.upstream/2.4.56
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'docs/manual/mod/mod_proxy_fcgi.html.en')
| -rw-r--r-- | docs/manual/mod/mod_proxy_fcgi.html.en | 356 |
1 files changed, 356 insertions, 0 deletions
diff --git a/docs/manual/mod/mod_proxy_fcgi.html.en b/docs/manual/mod/mod_proxy_fcgi.html.en new file mode 100644 index 0000000..3b6d433 --- /dev/null +++ b/docs/manual/mod/mod_proxy_fcgi.html.en @@ -0,0 +1,356 @@ +<?xml version="1.0" encoding="UTF-8"?> +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> +<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head> +<meta content="text/html; charset=UTF-8" http-equiv="Content-Type" /> +<!-- + XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + This file is generated from xml source: DO NOT EDIT + XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + --> +<title>mod_proxy_fcgi - Apache HTTP Server Version 2.4</title> +<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> +<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> +<link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="../style/css/prettify.css" /> +<script src="../style/scripts/prettify.min.js" type="text/javascript"> +</script> + +<link href="../images/favicon.ico" rel="shortcut icon" /></head> +<body> +<div id="page-header"> +<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="<-" alt="<-" src="../images/left.gif" /></a></div> +<div id="path"> +<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.4</a> > <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"> en </a> | +<a href="../fr/mod/mod_proxy_fcgi.html" hreflang="fr" rel="alternate" title="Français"> fr </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__&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> +<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/" +<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 + PATH_INFO. + </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><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"> en </a> | +<a href="../fr/mod/mod_proxy_fcgi.html" hreflang="fr" rel="alternate" title="Français"> fr </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&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> +<script type="text/javascript"><!--//--><![CDATA[//><!-- +var comments_shortname = 'httpd'; +var comments_identifier = 'http://httpd.apache.org/docs/2.4/mod/mod_proxy_fcgi.html'; +(function(w, d) { + if (w.location.hostname.toLowerCase() == "httpd.apache.org") { + d.write('<div id="comments_thread"><\/div>'); + var s = d.createElement('script'); + s.type = 'text/javascript'; + s.async = true; + s.src = 'https://comments.apache.org/show_comments.lua?site=' + comments_shortname + '&page=' + comments_identifier; + (d.getElementsByTagName('head')[0] || d.getElementsByTagName('body')[0]).appendChild(s); + } + else { + d.write('<div id="comments_thread">Comments are disabled for this page at the moment.<\/div>'); + } +})(window, document); +//--><!]]></script></div><div id="footer"> +<p class="apache">Copyright 2023 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p> +<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></div><script type="text/javascript"><!--//--><![CDATA[//><!-- +if (typeof(prettyPrint) !== 'undefined') { + prettyPrint(); +} +//--><!]]></script> +</body></html>
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