Fixing bug #227562 by calling URLopener.http_error_default when

an invalid 401 request is being handled.

Lib/urllib.py

@@ -560,13 +560,19 @@ class FancyURLopener(URLopener):
         """Error 401 -- authentication required.
         See this URL for a description of the basic authentication scheme:
         http://www.ics.uci.edu/pub/ietf/http/draft-ietf-http-v10-spec-00.txt"""
-        if headers.has_key('www-authenticate'):
+        if not headers.has_key('www-authenticate'):
+            URLopener.http_error_default(self, url, fp, 
+                                         errmsg, headers)
         stuff = headers['www-authenticate']
         import re
         match = re.match('[ \t]*([^ \t]+)[ \t]+realm="([^"]*)"', stuff)
-            if match:
+        if not match:
+            URLopener.http_error_default(self, url, fp, 
+                                         errcode, errmsg, headers)
         scheme, realm = match.groups()
-                if scheme.lower() == 'basic':
+        if scheme.lower() != 'basic':
+            URLopener.http_error_default(self, url, fp, 
+                                         errcode, errmsg, headers)
         name = 'retry_' + self.type + '_basic_auth'
         if data is None:
             return getattr(self,name)(url, realm)