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<title>3.5 Your Own 404 Handler</title>
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<H1><A NAME="SECTION005500000000000000000"></A><A NAME="tut-404-handler"></A>
<BR>
3.5 Your Own 404 Handler
</H1>

<P>
In some cases, you may wish to return a 404 (<tt class="constant">HTTP_NOT_FOUND</tt>) or
other non-200 result from your handler.  There is a trick here.  if you
return <tt class="constant">HTTP_NOT_FOUND</tt> from your handler, Apache will handle
rendering an error page.  This can be problematic if you wish your handler
to render it's own error page.

<P>
In this case, you need to set <code>req.status = apache.HTTP_NOT_FOUND</code>,
render your page, and then <code>return(apache.OK)</code>:

<P>
<div class="verbatim"><pre>
   from mod_python import apache

   def handler(req):
      if req.filename[-17:] == 'apache-error.html':
         #  make Apache report an error and render the error page
         return(apache.HTTP_NOT_FOUND)
      if req.filename[-18:] == 'handler-error.html':
         #  use our own error page
         req.status = apache.HTTP_NOT_FOUND
         pagebuffer = 'Page not here.  Page left, not know where gone.'
      else:
         #  use the contents of a file
         pagebuffer = open(req.filename, 'r').read()

      #  fall through from the latter two above
      req.write(pagebuffer)
      return(apache.OK)
</pre></div>

<P>
Note that if wishing to returning an error page from a handler phase other
than the response handler, the value <code>apache.DONE</code> must be returned
instead of <code>apache.OK</code>. If this is not done, subsequent handler phases
will still be run. The value of <code>apache.DONE</code> indicates that processing
of the request should be stopped immediately. If using stacked response
handlers, then <code>apache.DONE</code> should also be returned in that situation
to prevent subsequent handlers registered for that phase being run if
appropriate.

<P>

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<span class="release-info">Release 3.3.1, documentation updated on January 29, 2007.</span>
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