It's not stupidity. There is really no way to know which file you want to keep longer than others without risking breaking things. CDN are actually a good, manu

It's not stupidity. There is really no way to know which file you want to keep longer than others without risking breaking things. CDN are actually a good, manually updated, source of listing of files that have this quality. But basing yourself on proprietary CDN are not a move any browser in their right might would do.