diff -ur Quixote-0.5.1/server/medusa_http.py Quixote-0.5.1.fixed/server/medusa_http.py
--- Quixote-0.5.1/server/medusa_http.py	2002-08-05 12:41:57.000000000 -0400
+++ Quixote-0.5.1.fixed/server/medusa_http.py	2002-12-11 10:38:13.000000000 -0500
@@ -60,6 +60,9 @@
                    'SERVER_PROTOCOL':'HTTP/1.1',
                    'SERVER_SOFTWARE':self.server_name,
                    }
+	for k,v in environ.items():
+	    if v == None:
+		environ[k] = ''
 
         stdin = StringIO(data)
         qreq = HTTPRequest(stdin, environ)