Age HTTP Header - Original Server Response
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The Age header contains the time in seconds the object has been in a proxy cache.
X-Cache HTTP Header
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The resource was not in the website cache, and was pulled from the origin server like Varnish servers.
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No Cache Content
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Forces caches to submit the request to the origin server for validation before releasing a cached copy.
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Must Revalidate HTTP Cache-Control
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Indicates that once a resource has become stale (e.g. max-age has expired), a cache must not use the response to satisfy subsequent requests for this resource without successful validation on the origin server.
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Vary Header check for cookies
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The Vary HTTP response header determines how to match future request headers to decide whether a cached response can be used rather than requesting a fresh one from the origin server. It is used by the server to indicate which headers it used when selecting a representation of a resource in a content negotiation algorithm.
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