Re: [fetch] CSP Request Header and CORS preflight fetch. (#52)

Yeah. Regarding `Last-Event-ID`, I'm considering that it's in "feature level". Me too love to figure out the right way.

My initial impression for `Save-Data` was that it should live in "just prior to network level", but seems Ben Greenstein (Data reduction proxy developer) and @igrigorik's idea is that it should be observable by SW. Thanks for looping him in.

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