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8 <title>mod_proxy_scgi - Apache HTTP Server</title>
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19 <p class="apache">Apache HTTP Server Version 2.5</p>
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24 <div id="page-content">
25 <div id="preamble"><h1>Apache Module mod_proxy_scgi</h1>
27 <p><span>Available Languages: </span><a href="../en/mod/mod_proxy_scgi.html" title="English"> en </a></p>
29 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>SCGI gateway module for <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></td></tr>
30 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
31 <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>proxy_scgi_module</td></tr>
32 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_proxy_scgi.c</td></tr>
33 <tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in version 2.2.14 and later</td></tr></table>
36 <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
37 <a href="http://python.ca/scgi/protocol.txt">SCGI protocol, version
40 <p>Thus, in order to get the ability of handling the SCGI protocol,
41 <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code> and <code class="module"><a href="../mod/mod_proxy_scgi.html">mod_proxy_scgi</a></code> have to
42 be present in the server.</p>
44 <div class="warning"><h3>Warning</h3>
45 <p>Do not enable proxying until you have <a href="mod_proxy.html#access">secured your server</a>. Open proxy
46 servers are dangerous both to your network and to the Internet at
50 <div id="quickview"><h3 class="directives">Directives</h3>
52 <li><img alt="" src="../images/down.gif" /> <a href="#proxyscgiinternalredirect">ProxySCGIInternalRedirect</a></li>
53 <li><img alt="" src="../images/down.gif" /> <a href="#proxyscgisendfile">ProxySCGISendfile</a></li>
57 <li><img alt="" src="../images/down.gif" /> <a href="#examples">Examples</a></li>
58 <li><img alt="" src="../images/down.gif" /> <a href="#env">Environment Variables</a></li>
59 </ul><h3>See also</h3>
61 <li><code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></li>
62 <li><code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code></li>
63 </ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
64 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
66 <h2><a name="examples" id="examples">Examples</a></h2>
67 <p>Remember, in order to make the following examples work, you have to
68 enable <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code> and <code class="module"><a href="../mod/mod_proxy_scgi.html">mod_proxy_scgi</a></code>.</p>
70 <div class="example"><h3>Simple gateway</h3><pre class="prettyprint lang-config">
71 ProxyPass /scgi-bin/ scgi://localhost:4000/
75 <p>The balanced gateway needs <code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code> and
76 at least one load balancer algorithm module, such as
77 <code class="module"><a href="../mod/mod_lbmethod_byrequests.html">mod_lbmethod_byrequests</a></code>, in addition to the proxy
78 modules listed above. <code class="module"><a href="../mod/mod_lbmethod_byrequests.html">mod_lbmethod_byrequests</a></code> is the
79 default, and will be used for this example configuration.</p>
81 <div class="example"><h3>Balanced gateway</h3><pre class="prettyprint lang-config">
82 ProxyPass /scgi-bin/ balancer://somecluster/
83 <Proxy balancer://somecluster/>
84 BalancerMember scgi://localhost:4000/
85 BalancerMember scgi://localhost:4001/
89 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
91 <h2><a name="env" id="env">Environment Variables</a></h2>
92 <p>In addition to the configuration directives that control the
93 behaviour of <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code>, there are a number of
94 <dfn>environment variables</dfn> that control the SCGI protocol
97 <dt>proxy-scgi-pathinfo</dt>
98 <dd>By default <code class="module"><a href="../mod/mod_proxy_scgi.html">mod_proxy_scgi</a></code> will neither create
99 nor export the <var>PATH_INFO</var> environment variable. This allows
100 the backend SCGI server to correctly determine <var>SCRIPT_NAME</var>
101 and <var>Script-URI</var> and be compliant with RFC 3875 section 3.3.
102 If instead you need <code class="module"><a href="../mod/mod_proxy_scgi.html">mod_proxy_scgi</a></code> to generate
103 a "best guess" for <var>PATH_INFO</var>, set this env-var.</dd>
106 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
107 <div class="directive-section"><h2><a name="ProxySCGIInternalRedirect" id="ProxySCGIInternalRedirect">ProxySCGIInternalRedirect</a> <a name="proxyscgiinternalredirect" id="proxyscgiinternalredirect">Directive</a></h2>
108 <table class="directive">
109 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable or disable internal redirect responses from the
111 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxySCGIInternalRedirect On|Off</code></td></tr>
112 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ProxySCGIInternalRedirect On</code></td></tr>
113 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
114 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
115 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy_scgi</td></tr>
117 <p>The <code class="directive">ProxySCGIInternalRedirect</code> enables the backend
118 to internally redirect the gateway to a different URL. This feature
119 origins in <code class="module"><a href="../mod/mod_cgi.html">mod_cgi</a></code>, which internally redirects the
120 response, if the response status is <code>OK</code> (<code>200</code>) and
121 the response contains a <code>Location</code> header and its value starts
122 with a slash (<code>/</code>). This value is interpreted as a new local
123 URL the apache internally redirects to.</p>
125 <p><code class="module"><a href="../mod/mod_proxy_scgi.html">mod_proxy_scgi</a></code> does the same as
126 <code class="module"><a href="../mod/mod_cgi.html">mod_cgi</a></code> in this regard, except that you can turn off the
129 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">
130 ProxySCGIInternalRedirect Off
135 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
136 <div class="directive-section"><h2><a name="ProxySCGISendfile" id="ProxySCGISendfile">ProxySCGISendfile</a> <a name="proxyscgisendfile" id="proxyscgisendfile">Directive</a></h2>
137 <table class="directive">
138 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable evaluation of <var>X-Sendfile</var> pseudo response
140 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxySCGISendfile On|Off|<var>Headername</var></code></td></tr>
141 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ProxySCGISendfile Off</code></td></tr>
142 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
143 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
144 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy_scgi</td></tr>
146 <p>The <code class="directive">ProxySCGISendfile</code> directive enables the
147 SCGI backend to let files serve directly by the gateway. This is useful
148 performance purposes -- the httpd can use <code>sendfile</code> or other
149 optimizations, which are not possible if the file comes over the backend
151 <p>The <code class="directive">ProxySCGISendfile</code> argument determines the
152 gateway behaviour:</p>
154 <dt><code>Off</code></dt>
155 <dd>No special handling takes place.</dd>
157 <dt><code>On</code></dt>
158 <dd>The gateway looks for a backend response header called
159 <code>X-Sendfile</code> and interprets the value as filename to serve. The
160 header is removed from the final response headers. This is equivalent to
161 <code>ProxySCGISendfile X-Sendfile</code>.</dd>
163 <dt>anything else</dt>
164 <dd>Similar to <code>On</code>, but instead of the hardcoded header name
165 the argument is applied as header name.</dd>
168 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">
169 # Use the default header (X-Sendfile)
172 # Use a different header
173 ProxySCGISendfile X-Send-Static
179 <div class="bottomlang">
180 <p><span>Available Languages: </span><a href="../en/mod/mod_proxy_scgi.html" title="English"> en </a></p>
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