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<div class="retired"><h4>Please note</h4>
            <p> This document refers to a legacy release (<strong>2.2</strong>) of Apache httpd. The active release (<strong>2.4</strong>) is documented <a href="http://httpd.apache.org/docs/current">here</a>. If you have not already upgraded, please follow <a href="http://httpd.apache.org/docs/current/upgrading.html">this link</a> for more information.</p>
        <p>You may follow <a href="http://httpd.apache.org/docs/current/mod/mod_proxy_scgi.html">this link</a> to go to the current version of this document.</p></div><div id="preamble"><h1>Apache Module mod_proxy_scgi</h1>
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<p><span>Available Languages: </span><a href="../en/mod/mod_proxy_scgi.html" title="English">&nbsp;en&nbsp;</a> |
<a href="../ja/mod/mod_proxy_scgi.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&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>
</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>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>
</ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
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<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><p><code>
      ProxyPass /scgi-bin/ scgi://localhost:4000/
    </code></p></div>

    <p>The balanced gateway needs <code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code> in
    addition to the already mentioned proxy modules.</p>

    <div class="example"><h3>Balanced gateway</h3><p><code>
    ProxyPass /scgi-bin/ balancer://somecluster/<br />
    &lt;Proxy balancer://somecluster/&gt;<br />
    <span class="indent">
        BalancerMember scgi://localhost:4000/<br />
        BalancerMember scgi://localhost:4001/<br />
    </span>
    &lt;/Proxy&gt;
    </code></p></div>
</div>
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<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</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>
</table>
    <p>The <code class="directive">ProxySCGIInternalRedirect</code> enables the backend
    to internally redirect the gateway to a different URL. This feature
    origins 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> header and its value starts
    with a slash (<code>/</code>). This value is interpreted as a new local
    URL the apache 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.</p>

    <div class="example"><h3>Example</h3><p><code>
    ProxySCGIInternalRedirect Off
    </code></p></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 serve directly by the gateway. This is useful
    performance purposes -- the httpd can use <code>sendfile</code> or other
    optimizations, which are not possible if the file comes over the backend
    socket.</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 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
    the argument is applied as header name.</dd>
    </dl>

    <div class="example"><h3>Example</h3><p><code>
    # Use the default header (X-Sendfile)<br />
    ProxySCGISendfile On<br />
    <br />
    # Use a different header<br />
    ProxySCGISendfile X-Send-Static
    </code></p></div>

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