Beware of etag even if you are using nocache, the etag header isn't removed, because it works in a different way. For security reasons we do not want certain pages in our application to be. Without a field name, the directive applies to the entire request and a shared (proxy server) cache must force.
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Ok, even if you aren't using express, what essentially needed is to set the nocache headers.
It tells browsers and caches that the response.
It's generated at the end of the request and could be another source of. Spent days trying to get chromium based app to stop caching images. The ?nocache with time echo solved the issue. It was intended as a privacy measure:
I'm adding the headers in a reusable middleware, otherwise you can set those headers in any way.