Re: [whatwg/fetch] Request body streams should use chunked encoding (#966)

I did some more testing. 

It seems that while Heroku supports streaming uploads, and streaming downloads, it doesn't support bi-directional streaming correctly.

The server log indicates it's receiving the individual lines I send it, but the response appears to be buffered until the request body is completed. I'm going to create an issue on the appropriate Heroku repo.

That being said, this should work. And if the standard can mandate that it should be supported by H1, then it requires all middle boxes to be upgraded to support it.

Given that the vast majority of existing infrastructure still runs on H1 - I think this is going to be necessary. This isn't just about client -> server, but `client -> heroku -> server` etc.

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