Right now, it's hard to report Vary header correctly. Headers might get accessed in many different places, like middlewares, subroutines (which can't use patch_vary_headers as they don't have access to the response object), etc - and all those cases should be reflected in the Vary header, or something might get cached incorrectly.
However, thanks to the newly added request.headers property (see https://code.djangoproject.com/ticket/20147 and https://github.com/django/django/commit/4fc35a9c3efdc9154efce28cb23cb84f8834517e), we now have a single place which is used to access request headers. We can track which ones were accessed, and then set Vary header automatically, for example in a middleware. What do you think about: 1) adding some code to track accessed headers in request.headers, 2) adding a new middleware (or expanding an existing one), that sets the Vary header based on 1), 3) deprecating patch_vary_headers function and vary_on_headers/vary_on_cookie decorators and recommending to use request.headers instead? Thanks, Linus PS. This is a follow-up to the https://code.djangoproject.com/ticket/28533 ticket. -- You received this message because you are subscribed to the Google Groups "Django developers (Contributions to Django itself)" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-developers+unsubscr...@googlegroups.com. To post to this group, send email to email@example.com. Visit this group at https://groups.google.com/group/django-developers. To view this discussion on the web visit https://groups.google.com/d/msgid/django-developers/81484ff1-552e-4103-9fa8-8a3348512b84%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.