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<div id="preamble"><h1>Apache Module mod_proxy_scgi</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="../en/mod/mod_proxy_scgi.html" title="English">&nbsp;en&nbsp;</a> |
<a href="../fr/mod/mod_proxy_scgi.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a></p>
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<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>
<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_scgi_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_proxy_scgi.c</td></tr>
<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in version 2.2.14 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://python.ca/scgi/protocol.txt">SCGI protocol, version
    1</a>.</p>

    <p>Thus, in order to get the ability of handling the SCGI protocol,
    <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
    be present in the server.</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="#proxyscgiinternalredirect">ProxySCGIInternalRedirect</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#proxyscgisendfile">ProxySCGISendfile</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_scgi">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&amp;component=mod_proxy_scgi">Report a bug</a></li></ul><h3>See also</h3>
<ul class="seealso">
<li><code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></li>
<li><code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</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_scgi.html">mod_proxy_scgi</a></code>.</p>

    <div class="example"><h3>Simple gateway</h3><pre class="prettyprint lang-config">ProxyPass /scgi-bin/ scgi://localhost:4000/</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</h3><pre class="prettyprint lang-config">ProxyPass "/scgi-bin/" "balancer://somecluster/"
&lt;Proxy "balancer://somecluster"&gt;
    BalancerMember "scgi://localhost:4000"
    BalancerMember "scgi://localhost:4001"
&lt;/Proxy&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>, an <dfn>environment
    variable</dfn> may also control the SCGI protocol
    provider:</p>
    <dl>
        <dt>proxy-scgi-pathinfo</dt>
        <dd>By default <code class="module"><a href="../mod/mod_proxy_scgi.html">mod_proxy_scgi</a></code> will neither create
        nor export the <var>PATH_INFO</var> environment variable. This allows
        the backend SCGI 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_scgi.html">mod_proxy_scgi</a></code> to generate
        a "best guess" for <var>PATH_INFO</var>, set this env-var.  The
        variable must be set before <code class="directive"><a href="../mod/env.html#setenv">SetEnv</a></code>
        is effective.  <code class="directive"><a href="../mod/setenv.html#setenvif">SetEnvIf</a></code> can be
        used instead: <code>SetEnvIf Request_URI . proxy-scgi-pathinfo</code>
        </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="ProxySCGIInternalRedirect" id="ProxySCGIInternalRedirect">ProxySCGIInternalRedirect</a> <a name="proxyscgiinternalredirect" id="proxyscgiinternalredirect">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable or disable internal redirect responses from the
backend</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxySCGIInternalRedirect On|Off|<var>Headername</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ProxySCGIInternalRedirect On</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</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_scgi</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>The <var>Headername</var> feature is available in version
2.4.13 and later</td></tr>
</table>
    <p>The <code class="directive">ProxySCGIInternalRedirect</code> enables the backend
    to internally redirect the gateway to a different URL. This feature
    originates in <code class="module"><a href="../mod/mod_cgi.html">mod_cgi</a></code>, which internally redirects the
    response if the response status is <code>OK</code> (<code>200</code>) and
    the response contains a <code>Location</code> (or configured alternate
    header) and its value starts with a slash (<code>/</code>). This value is 
    interpreted as a new local URL that Apache httpd internally redirects to.</p>

    <p><code class="module"><a href="../mod/mod_proxy_scgi.html">mod_proxy_scgi</a></code> does the same as
    <code class="module"><a href="../mod/mod_cgi.html">mod_cgi</a></code> in this regard, except that you can turn off the
    feature or specify the use of a header other than <code>Location</code>.</p>

    <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">    ProxySCGIInternalRedirect Off

# Django and some other frameworks will fully qualify "local URLs"
# set by the application, so an alternate header must be used.
&lt;Location /django-app/&gt;
    ProxySCGIInternalRedirect X-Location
&lt;/Location&gt;</pre>
</div>

</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="ProxySCGISendfile" id="ProxySCGISendfile">ProxySCGISendfile</a> <a name="proxyscgisendfile" id="proxyscgisendfile">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable evaluation of <var>X-Sendfile</var> pseudo response
header</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxySCGISendfile On|Off|<var>Headername</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ProxySCGISendfile Off</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</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_scgi</td></tr>
</table>
    <p>The <code class="directive">ProxySCGISendfile</code> directive enables the
    SCGI backend to let files be served directly by the gateway. This is useful
    for performance purposes &#8212; httpd can use <code>sendfile</code> or other
    optimizations, which are not possible if the file comes over the backend
    socket.  Additionally, the file contents are not transmitted twice.</p>
    <p>The <code class="directive">ProxySCGISendfile</code> argument determines the
    gateway behaviour:</p>
    <dl>
    <dt><code>Off</code></dt>
    <dd>No special handling takes place.</dd>

    <dt><code>On</code></dt>
    <dd>The gateway looks for a backend response header called
    <code>X-Sendfile</code> and interprets the value as the filename to serve.
    The  header is removed from the final response headers. This is equivalent to
    <code>ProxySCGISendfile X-Sendfile</code>.</dd>

    <dt>anything else</dt>
    <dd>Similar to <code>On</code>, but instead of the hardcoded header name
    <code>X-Sendfile</code>, the argument is used as the header name.</dd>
    </dl>

    <div class="example"><h3>Example</h3><pre class="prettyprint lang-config"># Use the default header (X-Sendfile)
ProxySCGISendfile On
    
# Use a different header
ProxySCGISendfile X-Send-Static</pre>
</div>

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