Max-age=0 signifies that the response is straight away stale, and should-revalidate signifies that it should not be reused without the need of revalidation after it is stale — so, together, the semantics appear to be the same as no-cache. ! Following seeking every thing in each individual other suggestion, including https://johnnysqjaq.blogkoo.com/the-2-minute-rule-for-coldfire-thc-55725528