#23939: SessionAuthenticationMiddleware causes "Vary: Cookie" header no matter
what
------------------------------+---------------------
Reporter: andrewbadr | Owner: nobody
Type: Bug | Status: new
Component: contrib.auth | Version: 1.7
Severity: Normal | Keywords: cookies
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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Setting a "Vary: Cookie" header when unnecessary is bad for reasons
described in e.g. #3586, #6552. It seems that the recently-introduced and
on-by-default SessionAuthenticationMiddleware causes this header to always
be set. This seems to be caused by the `hasattr(user,
'get_session_auth_hash')` check here:
https://github.com/django/django/blob/1.7.1/django/contrib/auth/middleware.py#L34.
To reproduce: start a new empty project with django-admin.py, request the
index page, and see that the Vary: Cookie header is present. Commenting-
out the middleware's line in settings.py causes the header to no longer be
sent.
It might be good to add a test verifying that the above steps never set a
Vary: Cookie header.
--
Ticket URL: <https://code.djangoproject.com/ticket/23939>
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