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As a result, the ability to cache and reuse previously fetched resources is a critical aspect of optimizing for performance.The good news is that every browser ships with an implementation of an HTTP cache.

Large responses require many roundtrips between the client and server, which delays when they are available and when the browser can process them, and also incurs data costs for the visitor.

Find your favorite server in the list, look for the appropriate settings, and copy/confirm that your server is configured with the recommended settings.

From a performance optimization perspective, the best request is a request that doesn't need to communicate with the server: a local copy of the response allows you to eliminate all network latency and avoid data charges for the data transfer.

For example, in the above exchange, the server returns a 1024-byte response, instructs the client to cache it for up to 120 seconds, and provides a validation token ("x234dff") that can be used after the response has expired to check if the resource has been modified.

Assume that 120 seconds have passed since the initial fetch and the browser has initiated a new request for the same resource.

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