extensionHeaders in method File.getSignedUrl do not work as expected about nodejs-storage HOT 1 CLOSED

file.getSignedUrl({
  action: 'read',
  expires: Date.now() + 5000,
  extensionHeaders: {
    'x-goog-my-header': 'my-header-value'
  }
}, function(err, signedReadUrl) {
  request.get(signedReadUrl, {
    headers: {
      'x-goog-my-header': 'my-header-value'
    }
  }, function(err, resp, body) {
    // Worked!
  })
})