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* Add Cache-Control to avatar redirects This does seem to do the trick to make the Avatar redirects cachable in Chrome. In Firefox, it does not seem to work, thought and I found no way to suppress the requests to the original URLs, I even tried setting an Etag to no avail. Related discussion in https://github.com/go-gitea/gitea/issues/16964. Co-authored-by: zeripath <art27@cantab.net>