Images are unlikely to be of interest when fetching some data to a script. A redirect is obviously useless since it doesn't get the data to the script. The cache must be synchronized not to update faster than once per second also, so whether you're using a cache or not does not automatically ensure strict compliance to the demand under any circumstance. If you already have some sort of serializing mechanism though, adding caching to it is a an excellent proposal.

Makeshifts last the longest.