Returns true if the request contains an Authorization header, false otherwise.
Returns true if the response contains an expires header, false otherwise.
"the Authorization header field (see Section 4.2 of [Part7]) does not appear in the request, if the cache is shared, unless the response explicitly allows it (see Section 3.2)"
"the "no-store" cache directive (see Section 5.2) does not appear in request or response header fields"
"the "private" response directive (see Section 188.8.131.52) does not appear in the response, if the cache is shared, and"
Returns DoNotCacheResponse if this is not an "understood" response code, according to cache.isUnderstoodStatusCode.
Returns an action indicating whether the request should be cached or not.
Returns true if this is an extension that allows it to be cached.
Returns DoNotCacheResponse if request method is not cacheable, according to cache.isCacheableMethod.
Returns true if the response is cacheable.