Max-age=0 ensures that the response is immediately stale, and have to-revalidate ensures that it must not be reused without having revalidation after it really is stale — so, in combination, the semantics seem to be similar to no-cache. This allows an origin server to prevent caching even by caches which https://tysonnjeyp.full-design.com/the-definitive-guide-to-cold-fire-cart-78749477