Suggestion: Make use of more HTTP caching headers

[ldesgoui]

Hello,

It seems like HTTP caching headers could score you some very cheap, significant wins.

I saw Cache-Control already returns immutable, I think you could probably push that to public, max-age=31536000, immutable, as well as providing ETag, Last-Modified and Expires.

There are more cases where those can be returned as well, I think that any response for which a NAR was successfully fetched, so directory listing, redirects, but also 404s when a file was not found.

MDN has a great resource about this: https://developer.mozilla.org/en-US/docs/Web/HTTP/Caching

Pretty cool project!

Bests

[zimbatm]

I don't plan on doing this immediately but that's a good idea. I thought that all modern browsers supported immutable. It looks like only Firefox and Safari do at this point in time; https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control#browser_compatibility