Add fingerprint and cache headers to gonzo_web download link

Issue #2 resolved
Brian Mearns
repo owner created an issue

on gonzo_web (the download server), the link provided from the index should include a fingerprint of the file. If a request is made for the file using that fingerprint, then the response should include cache directive headers instructing the client to cache it for a long time (just short of a year).

The fingerprint can be randomly generated and include the time of launch, or can be a hash of the content