In invalidating cache

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In the preceding example, the client automatically provides the ETag token in the "If-None-Match" HTTP request header.The server checks the token against the current resource.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.To achieve this, the HTTP specification allows the server to return Cache-Control directives that control how, and for how long, the browser and other intermediate caches can cache the individual response.The Cache-Control header was defined as part of the HTTP/1.1 specification and supersedes previous headers (for example, Expires) used to define response caching policies.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.

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"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.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.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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