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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.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.Check your server documentation for the necessary configuration flags.Tip: The HTML5 Boilerplate project contains sample configuration files for all the most popular servers with detailed comments for each configuration flag and setting.Check the platform documentation and confirm your settings.When the server returns a response, it also emits a collection of HTTP headers, describing its content-type, length, caching directives, validation token, and more.
The only thing left to do is to ensure that the server is providing the necessary ETag tokens.
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.
At this point, the browser could dispatch a new request and fetch the new full response.
However, that’s inefficient because if the resource hasn't changed, then there's no reason to download the same information that's already in cache!