Add 'private' to Cache-Control, match Rails expectations #20608
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Several controlers set quite intricate Cache-Control headers in order to hopefully not be cached by any intermediate proxies or local caches. Unfortunately, these headers are processed by ActionDispatch::HTTP::Cache in a way that squashes and discards any values set alongside no-store other than private: https://github.com/rails/rails/blob/8015c2c2cf5c8718449677570f372ceb01318a32/actionpack/lib/action_dispatch/http/cache.rb#L207-L209 We want to preserve no-store on these responses, but we might as well remove parts that are going to be dropped anyway. As many of the endpoints in these controllers are private to a particular user, we should also add "private", which will be preserved alongside no-store.
ineffyble
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Gargron
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Nov 16, 2022
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Several controlers set quite intricate Cache-Control headers in order to hopefully not be cached by any intermediate proxies or local caches. Unfortunately, these headers are processed by ActionDispatch::HTTP::Cache in a way that squashes and discards any values set alongside no-store other than private: https://github.com/rails/rails/blob/8015c2c2cf5c8718449677570f372ceb01318a32/actionpack/lib/action_dispatch/http/cache.rb#L207-L209
We want to preserve no-store on these responses, but we might as well remove parts that are going to be dropped anyway. As many of the endpoints in these controllers are private to a particular user, we should also add "private", which will be preserved alongside no-store.