Index: urllib2.py
===================================================================
--- urllib2.py	(revision 81581)
+++ urllib2.py	(working copy)
@@ -971,10 +971,14 @@
         else:
             entdig = None
 
+        # XXX selector: what about proxies and full urls
+        request_uri = req.get_selector()
+        if not request_uri:
+            request_uri = '/'
+
         A1 = "%s:%s:%s" % (user, realm, pw)
-        A2 = "%s:%s" % (req.get_method(),
-                        # XXX selector: what about proxies and full urls
-                        req.get_selector())
+        A2 = "%s:%s" % (req.get_method(), request_uri)
+
         if qop == 'auth':
             if nonce == self.last_nonce:
                 self.nonce_count += 1
@@ -995,7 +999,7 @@
         # XXX should the partial digests be encoded too?
 
         base = 'username="%s", realm="%s", nonce="%s", uri="%s", ' \
-               'response="%s"' % (user, realm, nonce, req.get_selector(),
+               'response="%s"' % (user, realm, nonce, request_uri,
                                   respdig)
         if opaque:
             base += ', opaque="%s"' % opaque