When a cache hit on one of the "dummy" objects are seen, the object is first searched for matching request headers. If a match is found then it jumps to the key of the matching object.
If no match is found then all known entity tags for the URL is collected, verified to exist in the cache, and sent in a If-None-Match request.
When a 304 or 200 reply is received the matching entity variance and identity information is added to the head of the dummy object as described in the store format.
