On reentering the cached content etag is not validating realmarrieddating
For example, a user's browser can cache an HTML page with private user information, but a CDN can't cache the page.
Tip: The HTML5 Boilerplate project contains sample configuration files for all the most popular servers with detailed comments for each configuration flag and setting.
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.
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.