An HTTP request. Instances of this class are immutable if their body is null or itself immutable.
Constructs a new request.
Returns the cache control directives for this response. This is never null, even if this response contains no Cache-Control header.
Cache-Control
Returns the tag attached with T as a key, or null if no tag is attached with that key.
Returns the tag attached with type as a key, or null if no tag is attached with that key.