Changed django.utils.cache.patch_response_headesr to move unnecessary calculation of 'expires' into the 'if' statement
Changed django.utils.cache.patch_response_headesr to move unnecessary calculation of 'expires' into the 'if' statement

--HG--
extra : convert_revision : svn%3Abcc190cf-cafb-0310-a4f2-bffc1f526a37/django/trunk%402528

Belgabor/django,Belgabor/django,Belgabor/django