Early Hints and Fetch

[annevk]

Currently https://fetch.spec.whatwg.org/#concept-http-network-fetch ignores all 1xx responses, it seems this would have to be changed somehow, assuming this is to be adopted in user agents implementing Fetch.

It would also have to be done in such a way that any security checks applying to responses also apply to these responses (also tracked by #687 to some extent).

[mnot]

Shouldn't this be an issue for whatwg/fetch?

[mnot]

/me is looking for a reason to use the GitHub "Transfer this issue" beta feature...

[annevk]

I guess I'd like those driving Early Hints to take responsibility for it, so whatever makes that easier.