id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
13285	Generic views call populate_xheaders, which breaks caching	Carl Meyer	Łukasz Langa	"Many of the Django generic views (as well as the flatpage view) call django.core.xheaders.populate_xheaders on the response. Populate_xheaders checks request.user, in order to include xheaders if the logged-in user is a staff member. Checking request.user triggers session access, which causes SessionMiddleware to add Vary: Cookie to the response, which makes caching much less efficient.

There should be some way to turn off populate_xheaders in production (or at least turn off the user-is-staff check), so efficient caching can be achieved."	Bug	closed	Core (Cache system)	1.1	Normal	fixed			Ready for checkin	1	0	0	0	0	0