Re: [fetch] [Question] Is there any suggested way to tell if we are dealing with a fetch request server-side? (#58)

There is no such plan. Each framework/site can make up their own conventions, as with `XMLHttpRequest`, but we do not want to dictate and certainly not add "cruft" to requests that is not strictly speaking required.

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https://github.com/whatwg/fetch/issues/58#issuecomment-110339399