We really need a way to tell the browser NOT to access or return the cache if the server returns a 304. There are so many situations where stale data just gets

We really need a way to tell the browser NOT to access or return the cache if the server returns a 304. There are so many situations where stale data just gets discarded because it's not actually useful, but the browser still goes through the motions of accessing the disk, storing in memory and then garbage collecting immediately. The browsers' only existing capabilities are to naively assume that we still need to process that file in some way, but the only thing accomplished is using some electricity.