docs: def createAssetFromURL(self, url, async=False, metadata=None, callback=None):
      """Users the passed URL to load data. If async=false a json with the result is returned otherwise a json with an asset_id is returned.
  
      :param url:
      :param metadata: arbitrary additional description information for the asset
      :param async:
      :param callback: Callback URL
      :return:
      """
      audio = {'uri': url}
      config = {'async': async}
      if callback is not None:
        config['callback'] = callback
      if metadata is not None:
        body = {'audio': audio, 'config': config, 'metadata': metadata}
      else:
        body = {'audio': audio, 'config': config}
  
      return self._checkReturn(
        requests.post("{}/speech:recognize?signed_username={}".format(self.url, self.signedUsername), json=body))