model save with tf.io.http and custom headers do not work

[batrlatom]

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TensorFlow.js version

1.3.1

Browser version

Chrome

Describe the problem or feature request

I am trying to save tfjs model on server with additional headers, but headers are not present in the request.

Code to reproduce the bug / link to feature request

web:
await model.save(tf.io.browserHTTPRequest(
'http://localhost:5000/upload',
{method: 'POST', headers: {'class': 'Dog'}}));

server:
https://gist.github.com/dsmilkov/1b6046fd6132d7408d5257b0976f7864

• 'print(request.headers)' in /upload method

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GitHub issues for this repository are tracked in the tfjs union repository.

Please file your issue there, following the guidance in that issue template.

[batrlatom]

Documentation differs from the implementation slightly. It would be nice to
change it to actual one ( at: https://js.tensorflow.org/api/latest/#io.http ) .

The right code for client headers should be

              const saveResult = await this.model.save(tf.io.http(
              'http://localhost:5000/upload', {requestInit: { method: 'POST',
               headers: {
                   'class': 'Dog'
               }}}));

[rthadur]

@batrlatom thank you , do you want to submit a PR for this change ?

cc @nsthorat @kangyizhang