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The Expires entity-header field gives the date/time after which the response is considered stale.
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By making use of it effectively, an application will appear faster, because it will reduce the amount of data and data connections that are sent needlessly.
These savings can help keep a user beneath their data cap, keep their battery from draining as quickly, and improve the responsiveness of wireless networks that have limited capacity.
If the age of the entry is less than the "freshness lifetime", then the cached entry is fresh and can be used.
If the age of the entry exceeds the "freshness lifetime", then the cached entry is stale and a full response must be sent.
The explicit directives in the Cache-Control header always take precedence over implicit information like the Expires date/time.