The “max-age” request directive indicates that the client is unwilling to accept a response whose age is greater than the specified number of seconds. Unless the max-stale request directive is also present, the client is not willing to accept a stale response. The “max-age” response directive indicates that the response is to be considered stale after its age is greater than the specified number of seconds. (RFC 7234: Hypertext Transfer Protocol (HTTP/1.1): Caching)


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