s-maxage
Stands for "shared max-age". Overrides max-age specifically for shared caches (CDNs, reverse proxies). Browser caches ignore this directive and use max-age instead. This allows different TTLs for edge caches vs. end-user browsers.
Stands for "shared max-age". Overrides max-age specifically for shared caches (CDNs, reverse proxies). Browser caches ignore this directive and use max-age instead. This allows different TTLs for edge caches vs. end-user browsers.