Future fetch(input, [ Map init ])

Source 

Future fetch(/*RequestInfo*/ input, [Map init]) {
  if (init != null) {
    return _blink.BlinkWindow.instance
        .fetch_Callback_2_(this, input, convertDartToNative_Dictionary(init));
  }
  return _blink.BlinkWindow.instance.fetch_Callback_1_(this, input);
}