Re: [ServiceWorker] should Cache support VARY:*,otherheader or only VARY:* (#656)

Vary: * means "varies on things that I can't describe" -- i.e., it's not cacheable. 

See: http://httpwg.github.io/specs/rfc7234.html#caching.negotiated.responses

Note that we're working on a more fine-grained header, "Key" to increase general sanity. WIP, YMMV.

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