Re: [fetch] Access to the HTTP trailer (#34)

The most conservative thing that could be done would be to target a handful of headers that we determine are safe to combine (e.g., timing information, ETag) and specify them to be processed by browsers. That would give some experience with this and meet some use cases; the general mechanism could be added later.

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https://github.com/whatwg/fetch/issues/34#issuecomment-126267453