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<title>CGI::Fast - CGI Interface for Fast CGI</title>
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<h1><a>CGI::Fast - CGI Interface for Fast CGI</a></h1>
<p><a name="__index__"></a></p>
<!-- INDEX BEGIN -->
<ul>
<li><a href="#name">NAME</a></li>
<li><a href="#synopsis">SYNOPSIS</a></li>
<li><a href="#description">DESCRIPTION</a></li>
<li><a href="#other_pieces_of_the_puzzle">OTHER PIECES OF THE PUZZLE</a></li>
<li><a href="#writing_fastcgi_perl_scripts">WRITING FASTCGI PERL SCRIPTS</a></li>
<li><a href="#installing_fastcgi_scripts">INSTALLING FASTCGI SCRIPTS</a></li>
<li><a href="#using_fastcgi_scripts_as_cgi_scripts">USING FASTCGI SCRIPTS AS CGI SCRIPTS</a></li>
<li><a href="#external_fastcgi_server_invocation">EXTERNAL FASTCGI SERVER INVOCATION</a></li>
<li><a href="#caveats">CAVEATS</a></li>
<li><a href="#author_information">AUTHOR INFORMATION</a></li>
<li><a href="#bugs">BUGS</a></li>
<li><a href="#see_also">SEE ALSO</a></li>
</ul>
<!-- INDEX END -->
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<p>
</p>
<h1><a name="name">NAME</a></h1>
<p>CGI::Fast - CGI Interface for Fast CGI</p>
<p>
</p>
<hr />
<h1><a name="synopsis">SYNOPSIS</a></h1>
<pre>
<span class="keyword">use</span> <span class="variable">CGI::Fast</span> <span class="string">qw(:standard)</span><span class="operator">;</span>
<span class="variable">$COUNTER</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
<span class="keyword">while</span> <span class="operator">(</span><span class="variable">new</span> <span class="variable">CGI::Fast</span><span class="operator">)</span> <span class="operator">{</span>
<span class="keyword">print</span> <span class="variable">header</span><span class="operator">;</span>
<span class="keyword">print</span> <span class="variable">start_html</span><span class="operator">(</span><span class="string">"Fast CGI Rocks"</span><span class="operator">);</span>
<span class="keyword">print</span>
<span class="variable">h1</span><span class="operator">(</span><span class="string">"Fast CGI Rocks"</span><span class="operator">),</span>
<span class="string">"Invocation number "</span><span class="operator">,</span><span class="variable">b</span><span class="operator">(</span><span class="variable">$COUNTER</span><span class="operator">++),</span>
<span class="string">" PID "</span><span class="operator">,</span><span class="variable">b</span><span class="operator">(</span><span class="variable">$$</span><span class="operator">),</span><span class="string">"."</span><span class="operator">,</span>
<span class="variable">hr</span><span class="operator">;</span>
<span class="keyword">print</span> <span class="variable">end_html</span><span class="operator">;</span>
<span class="operator">}</span>
</pre>
<p>
</p>
<hr />
<h1><a name="description">DESCRIPTION</a></h1>
<p>CGI::Fast is a subclass of the CGI object created by
CGI.pm. It is specialized to work well with the Open Market
FastCGI standard, which greatly speeds up CGI scripts by
turning them into persistently running server processes. Scripts
that perform time-consuming initialization processes, such as
loading large modules or opening persistent database connections,
will see large performance improvements.</p>
<p>
</p>
<hr />
<h1><a name="other_pieces_of_the_puzzle">OTHER PIECES OF THE PUZZLE</a></h1>
<p>In order to use CGI::Fast you'll need a FastCGI-enabled Web
server. See <a href="http://www.fastcgi.com/">http://www.fastcgi.com/</a> for details.</p>
<p>
</p>
<hr />
<h1><a name="writing_fastcgi_perl_scripts">WRITING FASTCGI PERL SCRIPTS</a></h1>
<p>FastCGI scripts are persistent: one or more copies of the script
are started up when the server initializes, and stay around until
the server exits or they die a natural death. After performing
whatever one-time initialization it needs, the script enters a
loop waiting for incoming connections, processing the request, and
waiting some more.</p>
<p>A typical FastCGI script will look like this:</p>
<pre>
<span class="comment">#!/usr/local/bin/perl # must be a FastCGI version of perl!</span>
<span class="keyword">use</span> <span class="variable">CGI::Fast</span><span class="operator">;</span>
<span class="operator">&</span><span class="variable">do_some_initialization</span><span class="operator">();</span>
<span class="keyword">while</span> <span class="operator">(</span><span class="variable">$q</span> <span class="operator">=</span> <span class="variable">new</span> <span class="variable">CGI::Fast</span><span class="operator">)</span> <span class="operator">{</span>
<span class="operator">&</span><span class="variable">process_request</span><span class="operator">(</span><span class="variable">$q</span><span class="operator">);</span>
<span class="operator">}</span>
</pre>
<p>Each time there's a new request, CGI::Fast returns a
CGI object to your loop. The rest of the time your script
waits in the call to new(). When the server requests that
your script be terminated, <code>new()</code> will return undef. You can
of course exit earlier if you choose. A new version of the
script will be respawned to take its place (this may be
necessary in order to avoid Perl memory leaks in long-running
scripts).</p>
<p>CGI.pm's default CGI object mode also works. Just modify the loop
this way:</p>
<pre>
<span class="keyword">while</span> <span class="operator">(</span><span class="variable">new</span> <span class="variable">CGI::Fast</span><span class="operator">)</span> <span class="operator">{</span>
<span class="operator">&</span><span class="variable">process_request</span><span class="operator">;</span>
<span class="operator">}</span>
</pre>
<p>Calls to header(), start_form(), etc. will all operate on the
current request.</p>
<p>
</p>
<hr />
<h1><a name="installing_fastcgi_scripts">INSTALLING FASTCGI SCRIPTS</a></h1>
<p>See the FastCGI developer's kit documentation for full details. On
the Apache server, the following line must be added to srm.conf:</p>
<pre>
AddType application/x-httpd-fcgi .fcgi</pre>
<p>FastCGI scripts must end in the extension .fcgi. For each script you
install, you must add something like the following to srm.conf:</p>
<pre>
FastCgiServer /usr/etc/httpd/fcgi-bin/file_upload.fcgi -processes 2</pre>
<p>This instructs Apache to launch two copies of file_upload.fcgi at
startup time.</p>
<p>
</p>
<hr />
<h1><a name="using_fastcgi_scripts_as_cgi_scripts">USING FASTCGI SCRIPTS AS CGI SCRIPTS</a></h1>
<p>Any script that works correctly as a FastCGI script will also work
correctly when installed as a vanilla CGI script. However it will
not see any performance benefit.</p>
<p>
</p>
<hr />
<h1><a name="external_fastcgi_server_invocation">EXTERNAL FASTCGI SERVER INVOCATION</a></h1>
<p>FastCGI supports a TCP/IP transport mechanism which allows FastCGI scripts to run
external to the webserver, perhaps on a remote machine. To configure the
webserver to connect to an external FastCGI server, you would add the following
to your srm.conf:</p>
<pre>
FastCgiExternalServer /usr/etc/httpd/fcgi-bin/file_upload.fcgi -host sputnik:8888</pre>
<p>Two environment variables affect how the <code>CGI::Fast</code> object is created,
allowing <code>CGI::Fast</code> to be used as an external FastCGI server. (See <code>FCGI</code>
documentation for <code>FCGI::OpenSocket</code> for more information.)</p>
<dl>
<dt><strong><a name="item_fcgi_socket_path">FCGI_SOCKET_PATH</a></strong>
<dd>
<p>The address (TCP/IP) or path (UNIX Domain) of the socket the external FastCGI
script to which bind an listen for incoming connections from the web server.</p>
</dd>
</li>
<dt><strong><a name="item_fcgi_listen_queue">FCGI_LISTEN_QUEUE</a></strong>
<dd>
<p>Maximum length of the queue of pending connections.</p>
</dd>
</li>
</dl>
<p>For example:</p>
<pre>
<span class="comment">#!/usr/local/bin/perl # must be a FastCGI version of perl!</span>
<span class="keyword">use</span> <span class="variable">CGI::Fast</span><span class="operator">;</span>
<span class="operator">&</span><span class="variable">do_some_initialization</span><span class="operator">();</span>
<span class="variable">$ENV</span><span class="operator">{</span><span class="string">FCGI_SOCKET_PATH</span><span class="operator">}</span> <span class="operator">=</span> <span class="string">"sputnik:8888"</span><span class="operator">;</span>
<span class="variable">$ENV</span><span class="operator">{</span><span class="string">FCGI_LISTEN_QUEUE</span><span class="operator">}</span> <span class="operator">=</span> <span class="number">100</span><span class="operator">;</span>
<span class="keyword">while</span> <span class="operator">(</span><span class="variable">$q</span> <span class="operator">=</span> <span class="variable">new</span> <span class="variable">CGI::Fast</span><span class="operator">)</span> <span class="operator">{</span>
<span class="operator">&</span><span class="variable">process_request</span><span class="operator">(</span><span class="variable">$q</span><span class="operator">);</span>
<span class="operator">}</span>
</pre>
<p>
</p>
<hr />
<h1><a name="caveats">CAVEATS</a></h1>
<p>I haven't tested this very much.</p>
<p>
</p>
<hr />
<h1><a name="author_information">AUTHOR INFORMATION</a></h1>
<p>Copyright 1996-1998, Lincoln D. Stein. All rights reserved.</p>
<p>This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.</p>
<p>Address bug reports and comments to: <a href="mailto:lstein@cshl.org">lstein@cshl.org</a></p>
<p>
</p>
<hr />
<h1><a name="bugs">BUGS</a></h1>
<p>This section intentionally left blank.</p>
<p>
</p>
<hr />
<h1><a name="see_also">SEE ALSO</a></h1>
<p><a href="../../lib/CGI/Carp.html">the CGI::Carp manpage</a>, <a href="../../lib/CGI.html">the CGI manpage</a></p>
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