anchor.diff:  }
   }
   
  -
  -}
  +}Exception catch(e){
  +print('Unknown exception: $e');
  +return '''{"user":["fail"]}''';
  +}
  +}
  
positive.code: 
  
  String getChannels(){
  List<Channel> channels =_chat.channels;
  
  String list ='''{"channels":[''';
  
negative.code: 
  
  void handleGetRequest(HttpRequest request) async{
  try {
  Map jsonData = request.uri.queryParameters;
  
  if(jsonData['channel'] != null && jsonData['channel'] != ''){
  