Prevent "etag" tracking
Description
The HTTP Etag is an opaque identifier assigned by a Web server to a specific version of a resource found at a URL, that should allow Web cache, but is often abused to track users among the web.
See also: https://en.wikipedia.org/wiki/HTTP_ETag , https://www.heise.de/security/meldung/User-Tracking-im-Web-Forscher-warnt-vor-heimtueckischer-Tracking-Technik-2048507.html , http://www.arctic.org/~dean/tracking-without-cookies.html , https://ptolemy.berkeley.edu/projects/truststc/education/reu/11/Posters/AyensonMWambachDpaper.pdf and https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/ETag
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