Ticket #579 (defect)

First let me note that I am a new user of CherryPy and also to WSGI in general so I may be mistaken on this. I was trying to use a simple cherrypy application (3.0 beta 2) with another WSGI server, specifically the twill wsgi_intercept mechanism (for testing). If a URL was submited with query arguments (ie ...?var=1&...) everything was fine. However a URL without query arguments produced a 500 error.

I tracked the problem to the initialization of the self.query_string variable in the run method of the Request object. If no query arguments were provided then self.query_string was set to None which caused problems later, in the process_headers method (line 563 self.params = http.parse_query_string...) where the query_string argument is None and parse_query_string expects a string paramater.

Per pep 333 the QUERY_STRING variable can be "empty or missing" so changing line 428 of the _cprequest module from:

self.query_string = query_string

to:

self.query_string = query_string or ""

fixed the problem. As an alternative, a test can be made wherever self.query_string is used and a string is expected. If you need more information please let me know. I can also submit a patch if you tell me how you want it.