...
The entire HTTP response is cached, including headers.
Best
...
Practices
Do not use any headers and query string parameters, like a timestamp, as part of your cache key, or it will never results result in a cache hitfulfilled request. You can optionally strip remove those headers using the Request Transformer policy. AlternativelyOr, avoid headers / query string parameters as part of the cache key and only as needed when a unique value is present per request.