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For example, a user's browser can cache an HTML page with private user information, but a CDN can't cache the page.This directive specifies the maximum time in seconds that the fetched response is allowed to be reused from the time of the request.All modern browsers support Cache-Control, so that's all you need."no-cache" indicates that the returned response can't be used to satisfy a subsequent request to the same URL without first checking with the server if the response has changed.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.

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

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.

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!

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