1 is a pretty big flaw. As a trivial example, the "Date" header changes for every request on most web servers. News websites have minute to minute updates. The

1 is a pretty big flaw. As a trivial example, the "Date" header changes for every request on most web servers. News websites have minute to minute updates. The problem statement in the blog post covers these issues and sticks to validatation of a already-downloaded cache.