In my previous response on this thread, I suggested that
a patch should be made to _q_traverse() when I meant to
say try_publish().

Here is the version of Publisher.try_publish() that I think
might be helpful:

     def try_publish(self, request):
         """(request : HTTPRequest) -> object

         The master method that does all the work for a single request.
         Exceptions are handled by the caller.
         """
         self.start_request()
         path = request.get_environ('PATH_INFO', '')
         # from pprint import pformat; print pformat(request.environ)
         if path[:1] != '/':
             return redirect(
                 request.get_environ('SCRIPT_NAME', '') + '/' + path,
                 permanent=True)
         components = path[1:].split('/')
         output = self.root_directory._q_traverse(components)
         # The callable ran OK, commit any changes to the session
         self.finish_successful_request()
         return output

Also, and perhaps more useful here, the scgi_server.py program should
probably be started with --script-name=/scgi-test so that it will
patch up the incorrect values in the environment that comes from
lighttpd.