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

Okay, 
```
function consume(reader) {
  var total = 0
  return pump()
  function pump() {
    return reader.read().then(({done, value}) => {
      if (done) {
        return
      }
      total += value.byteLength
      log(`received ${value.byteLength} bytes (${total} bytes in total)`)
      return pump()
    })
  }
}

fetch("/music/pk/altes-kamuffel.flac")
  .then(res => consume(res.body.getReader()))
  .then(res => return res.json())
  .then((resultFromServer) => log(resultFromServer.file))
  .catch(e => log("something went wrong: " + e))
```

how return real response.json() from Server?

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