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By contrast, the browser can cache "private" responses.

However, these responses are typically intended for a single user, so an intermediate cache is not allowed to cache them.

First, the browser checks the local cache and finds the previous response.

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.

That’s the problem that validation tokens, as specified in the ETag header, are designed to solve.

The server generates and returns an arbitrary token, which is typically a hash or some other fingerprint of the contents of the file.

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.

If the token hasn't changed, the server returns a "304 Not Modified" response, which tells the browser that the response it has in cache hasn't changed and can be renewed for another 120 seconds.

Note that you don't have to download the response again, which saves time and bandwidth.

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