Core: Support access to response headers from POST requests #6578
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For some context: In #6169 (comment) we're sending back a
cache-controlheader to indicate to the client whether something can be safely cached or not.However, our
HTTPClientdidn't have a way to retrieve the response headers from a given request, so a workaround in #6169 was done, where response headers are sent back as part of the actual response.