anchor.diff:            }, onError: (e) {
               completer.completeError('Connection to server closed unexpectedly');
             }, onDone: () {
  +            print('publish item: ${result}');
               completer.complete(result);
             });
   
  
positive.code:           }, onError: (e) {
              completer.completeError('Connection to server closed unexpectedly');
            }, onDone: () {
              Map<String, String> response = JSON.decode(result) as Map<String, String>;
              _token = response['access_token'];
              if (_token == null) {
  
negative.code:           }, onError: (e) {
              completer.completeError('Connection to server closed unexpectedly');
            }, onDone: () {
              print('upload item: ${result}');
              completer.complete(result);
            });
  
  