I notice “vary: cookie” forces the browser to validate webpages every time. For instance, if you click on a link, go back and click the link again, the browser will do a 304, every time. Does the cookie parameter have to be emitted every time? I took it out and everything seems to be fine.
Here they say you dont have to emit the cookie parameter except when using sessions: http://code.djangoproject.com/ticket/3586
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