Validating html forms with javascript

First, the browser checks the local cache and finds the previous response.Unfortunately, the browser can't use the previous response because the response has now expired.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.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.

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

The client doesn't need to know how the fingerprint is generated; it only needs to send it to the server on the next request.

If the fingerprint is still the same, then the resource hasn't changed and you can skip the download.

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.

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