Re: [whatwg/fetch] specify default accept header on cors preflight (#922)

No. Sending the accept header was the original behavior of all UAs including chromium.

We'd just want to confirm the spec description if it reflects the actual UAs' implementation so that we can ship a brand new CORS implementaton as much compatible as possible.

Even if this is an optional one, we'd have an explit explanation to say so in the spec. Otherwise, we will receive bug reports from users continuously.

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