This library should be only handling cache logistics, moving a cdn cache to browser. Otherwise is ill advised because of the reasons specified. Every site that

This library should be only handling cache logistics, moving a cdn cache to browser. Otherwise is ill advised because of the reasons specified. Every site that can use a last mile performance optimization like this should already be serving everything from some form of cache, either from varnish or a cdn. So in theory, availability of the content should not be the problem.