Max-age=0 means that the reaction is instantly stale, and should-revalidate implies that it have to not be reused without revalidation as soon as it really is stale — so, in combination, the semantics appear to be the same as no-cache. What should implementations do when cache-Manage: no-cache revalidation failed is https://coldfire-carts73949.total-blog.com/5-simple-techniques-for-cold-fire-61642076