CACHE_MIDDLEWARE_ANONYMOUS_ONLY doesn't do anything when used with @cache_page in Django 1.2.5
As of [15382], setting CACHE_MIDDLEWARE_ANONYMOUS_ONLY to True and using @cache_page on a view will unconditionally cache the view's response, even for logged in users, and even when request.user is accessed.
For example:
@cache_page(60 * 15)
def view(request):
request.user
return HttpResponse('')
The response will be cached unconditionally, even for logged in requests. The headers will look like this:
[('Expires', 'Thu, 10 Feb 2011 02:53:28 GMT'),
('Vary', 'Cookie'),
('Last-Modified', 'Thu, 10 Feb 2011 02:38:28 GMT'),
('ETag', '"ee11cbb19052e40b07aac0ca060c23ee"'),
('Cache-Control', 'max-age=900'),
('Content-Type', 'text/html; charset=utf-8')]
Setting the decorators to @vary_on_cookie and then @cache_page results in the same thing. Flipping the order and setting them to @cache_page followed by @vary_on_cookie results in the correct behavior (no caching).
Also, the release notes for 1.2.5 make no mention of the changes introduced by [15382].
In [15559]: