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<H1><A NAME="SECTION008200000000000000000"> </A>
<BR>
6.2 CGI Handler
</H1>
<P>
<a name="l2h-157"> </a>
<P>
CGI handler is a handler that emulates the CGI environment under mod_python.
<P>
Note that this is not a "true" CGI environment in that it is emulated
at the Python level. <code>stdin</code> and <code>stdout</code> are provided by
substituting <code>sys.stdin</code> and <code>sys.stdout</code>, and the environment
is replaced by a dictionary. The implication is that any outside programs
called from within this environment via <code>os.system</code>, etc. will
not see the environment available to the Python program, nor will they
be able to read/write from standard input/output with the results expected
in a "true" CGI environment.
<P>
The handler is provided as a stepping stone for the migration of legacy
code away from CGI. It is not recommended that you settle on using
this handler as the preferred way to use mod_python for the long term.
<P>
To use it, simply add this to your <span class="file">.htaccess</span> file:
<P>
<dl><dd><pre class="verbatim">
SetHandler python-program
PythonHandler mod_python.cgihandler
</pre></dl>
<P>
As of version 2.7, the cgihandler will properly reload even indirectly
imported modules. This is done by saving a list of loaded modules
(sys.modules) prior to executing a CGI script, and then comparing it
with a list of imported modules after the CGI script is done. Modules
(except for whose whose __file__ attribute points to the standard
Python library location) will be deleted from sys.modules thereby
forcing Python to load them again next time the CGI script imports
them.
<P>
If you do not want the above behavior, edit the <span class="file">cgihandler.py</span>
file and comment out the code delimited by ###.
<P>
Tests show the cgihandler leaking some memory when processing a lot of
file uploads. It is still not clear what causes this. The way to work
around this is to set the Apache <code>MaxRequestsPerChild</code> to a non-zero
value.
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<span class="release-info">Release 2.7.10, documentation updated on December 07, 2003.</span>
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