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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!
The good news is that every browser ships with an implementation of an HTTP cache.
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.
As a result, if a proper validation token (ETag) is present, no-cache incurs a roundtrip to validate the cached response, but can eliminate the download if the resource has not changed. It simply disallows the browser and all intermediate caches from storing any version of the returned response—for example, one containing private personal or banking data.
Every time the user requests this asset, a request is sent to the server and a full response is downloaded.