Downstream Cache Invalidation

Using Django
1

Is there a way to tell the Browser to invalidate the cache before max-age expires?

I am invalidating the cache via cache.clear() every time I get a post_save or post_delete signal, this only invalidates the internal cache, as to my understanding.

2

There is no way - HTTP caching has no such mechanism. The closest thing is the use of ETags, if you can figure out a sensible way of computing them. See: HTTP caching - HTTP | MDN

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