Re: [fetch] RFC: a mechanism to bypass CORS preflight (#210)

I agree that the origin-wide preflight would be useful.

Not only Google's use case, but some more data is needed to rationalize the additional complexity, e.g. how many users of Chrome are using CORS preflight and how much latency could be reduced. We could figure out the data points using our JS metrics.

Wenbo, how much gain you'll have by this compared to the hack in the first post?

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