Re: [w3c/ServiceWorker] `Vary` and requests added below the SW (#1542)

It's the other way around.
`Vary` is a response header, which value indicates which request headers should be considered when matching requests to responses.
That way, a response with `Vary: User-Agent` that was cached in response to a request with a `User-Agent` header of Chrome 86 will no longer match requests with the Chrome 87 UA string.

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