Hi all,

after mostly caching via external tools or manually for years, I've been
trying out Django's built-in caching recently, and have ran into an issue that
I believe could improve the use cases of `cache_page` a lot:

`cache_page`/`CacheMiddleware` take an optional `key_prefix` argument as a
string, falling back to `settings.CACHE_MIDDLEWARE_KEY_PREFIX`.

If this argument could be a callable (getting the current request as
argument), it would be much easier to cache different versions of the page,
for example for users with different access rights, or to make sure newer
changes are reflected by including a version or timestamp in the cache key.

This change was proposed, uhm, 13 years ago, and was closed when the
key_prefix became a site-wide setting. Any arguments for/against re-opening?

  https://code.djangoproject.com/ticket/11269

Additionally, for several of my use cases it would have been very neat to be
able to determine the cache key myself, which is currently generated fairly
deep into the caching stack based on the prefix, the request and so on. While
that's a good default, it makes it harder to interact with the cache from
outside the request-response cycle for the view being cached.
(But that's a bigger ask, because there's less existing infrastructure to pass
down a changed key function – I'd be pretty happy with just a dynamic prefix.)

Best,
Tobias
-- 
Tobias Kunze / rixx (er/he)

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