diff -r 5c9b36969abc Lib/http/cookiejar.py
--- a/Lib/http/cookiejar.py	Tue Apr 09 06:00:16 2013 -0700
+++ b/Lib/http/cookiejar.py	Tue Apr 09 21:38:43 2013 +0800
@@ -699,17 +699,17 @@ def is_third_party(request):
     RFC 2965, section 3.3.6:
 
         An unverifiable transaction is to a third-party host if its request-
         host U does not domain-match the reach R of the request-host O in the
         origin transaction.
 
     """
     req_host = request_host(request)
-    if not domain_match(req_host, reach(request.get_origin_req_host())):
+    if not domain_match(req_host, reach(request.origin_req_host)):
         return True
     else:
         return False
 
 
 class Cookie:
     """HTTP Cookie.