Re: [whatwg/fetch] upload progress? (#21)

It can be done if browsers will start support ReadableStream for Request object's body.

Currently there is only support ReadableStream for Response object's body and you can use it for checking a _download_ progress.

They should implement that:
https://fetch.spec.whatwg.org/#bodyinit

Check your browser:
https://w3c-test.org/fetch/api/basic/request-upload.any.html

So, waiting for browser support, in this case you even do not need something like this: https://github.com/whatwg/fetch/issues/607

See also: https://github.com/whatwg/fetch/pull/425

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