Upload progress callback

This would solve…

Currently there’s no way to get upload progress other than passing a stream. What if we’re passing a 10MB Buffer instead? Readable.from(buffer) and we’re storing it twice, which is unfortunate. So for an application that handles 100MB at a time we would need 200MB.

The implementation should look like…

  client.dispatch({
    path: '/',
    method: 'GET',
    headers: {
      'x-foo': 'bar'
    }
  }, {
...
    onUploadProgress: (bytes) => {
      console.log(`onUploadProgress : ${bytes} bytes in total`)
    },
...
  })

I have also considered…

Reading the state from the underlying socket. It’s not so nice.

[mcollina]

This would be a nice feature to add! I think we should make the callback arrive to https://github.com/nodejs/undici/blob/b33dffa76d34d31a7ee189ac72c5ace5ef75e7f3/lib/client.js#L1423 and call it afterwards (if it’s present).

[mcollina]

I’m questioning a bit the use case… I would not allocate a massive buffer in the first place.