ENABLE_MANIFEST_CACHE and HEAD requests to manifests

[Yannik]

Hi,

since docker 20.10, when doing docker pull for an existing image, a HEAD request is done by default, thus not counting against the rate limit:

You can also confirm this by doing multiple docker pulls for the same image and checking your rate limit count.

Can you explain a bit more how the ENABLE_MANIFEST_CACHE option handles this?

Does it also cache HEAD requests?

[rpardini]

Hi, do a search on the issues: https://github.com/rpardini/docker-registry-proxy/search?q=HEAD+GET&type=issues
I haven't been able to actually work on this, there's tons of PRs pending. Hopefully soon!