The “no-cache” request directive indicates that a cache MUST NOT use a stored response to satisfy the request without successful validation on the origin server. The “no-cache” response directive indicates that the response MUST NOT be used to satisfy a subsequent request without successful validation on the origin server. This allows an origin server to prevent a cache from using it to satisfy a request without contacting it, even by caches that have been configured to send stale responses. (RFC 7234: Hypertext Transfer Protocol (HTTP/1.1): Caching)


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