[patch] add anonymous-only caching to CacheMiddleware

[matt]

Here is a patch against trunk's django.middleware.cache.CacheMiddleware to optionally only cache anonymously requested (non-logged-in user) pages. Since rendered pages may contain user-specific information if they are logged in, caching those site-wide is often a bad idea. With this mdified middleware and CACHE_MIDDLEWARE_ANONYMOUS_ONLY = True in your settings file, django can cache your non-logged in pages while serving up non-cached pages to logged in users.

I'm not a huge fan of CACHE_MIDDLEWARE_ANONYMOUS_ONLY so if someone thinks of a better name for it, feel free.

[matt]

patch for caching anonymous-only

[Malcolm Tredinnick]

I'm not a fan of this way of implementing this. I would prefer a view decorator function to indicate this sort of thing. It feels like more of a per-view thing than a per-project thing to me.

[Jacob]

(In [3395]) Added a CACHE_MIDDLEWARE_ANONYMOUS_ONLY setting which makes the cache ignore pages served to authenticated users. Fixes #1509 (thanks, Matt).

Also added a FAQ entry about using this setting to avoid caching of the admin interface.