Re: [whatwg/fetch] Consider removing trailers API (#772)

> @igrigorik okay, so a JavaScript API to get all trailers the server transmitted?

Yep. 

> I was asking as trailers are apparently always allowed to be appended to the non-trailer headers by an intermediary, which seems rather sketchy to me. And that's also a concern for the JavaScript API, that folks might rely on getting some trailer header but a user behind an intermediary wouldn't have it and get some kind of failure.

Right, I think that's WAI — @mnot please chime in here if not so. If you have an intermediary that's buffering the full response before flushing it (which is a terrible idea, but that's beside the point), they could move trailer content into the header block. I don't think we can stop that, and I'm also not sure that's a "problem" that we need to be concerned about.. After all, same intermediary may also arbitrarily strip headers due to various policies.

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