Re: [whatwg/fetch] Trailer support in the API (#981)

We are in a unsatisfying situation. Using fetch API with chunked transfer encoding there is currently no way to get the time when the chunk reception has started, see https://github.com/whatwg/streams/issues/1126 

When i stumbled upon HTTP Trailer [1] i shortly believed that we could solve our issue with it. The idea is to send a list with timestamps when each single chunk was put into "pipe" at server side. With some calculation we would be then enabled to calculate exact e2e network throughput. 

But unfortunately, fetch API doesn't support trailers. 
If you need a use case: we are in need for exact throughput calculation in low latency video streaming. 

Is there any chance for Trailer support in fetch API in future?

[1] https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Trailer

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