Remove the method discard_cache? as it never worked as intended.

[vpereira]

The key HTTP_CACHE_CONTROL doesn't live on request.headers but request.env, as you can see here https://api.rubyonrails.org/v5.2.0/classes/ActionDispatch/Request.html

[vpereira]

@coolo as we spoke earlier

[coolo]

Now seriously: if this is broken since 5fede5b (2012), we most likely don't need this function :)

It's purpose was to have a reliable F5, but looks like noone cares. So just give it a shove and just never discard caches.

[vpereira]

Now seriously: if this is broken since 5fede5b (2012), we most likely don't need this function :)

It's purpose was to have a reliable F5, but looks like noone cares. So just give it a shove and just never discard caches.

Yup. Much better