Cache-Control HTTP Header
Accepted ValuesMultiple options from the list below are allowed, each seperated by a comma. Some options take a value, and that is preceded with an = after the option.
Response will not change.
The time a browser should remember a site can only be accessed with https (seconds).max-age=4
Client will accept stale responses (seconds).max-stale=4
Client wants a response that will be fresh for the given time (seconds).min-fresh=4
Stale caches must not be used.
May be stored by any cache but must be validated by the server.
May not be stored by any cache.
Intermediate cache or proxy cannot modify the response or certain headers.
Do not use the network for responses.
May only be stored by a browser cache.
Stale shared caches must no be used.
May be stored by any cache.
Override max-age for shared caches, ignored by private caches.s-maxage=4
Client will accept a stale response if the check for a fresh one fails (seconds).stale-if-error=4
Client will accept a stale response and will check for a fresh one (seconds).stale-while-revalidate=4