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Are both "cache request directives" and "cache response directives" necessary?

If I already have "cache request directives", what is the essence of "cache response directives". Are they adding something? Will my application work without them?

I am looking for evidence of whether "cache response directives" are redundant. If they are redundant, I will not bother with them.

Gc _

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I assume that you are asking as an application developer, and if so, you should not worry about any Cache-Control header that your application receives in the request.

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