I have a method in a class but it is not returning values, is it because I'm passing parameters to the method?

Im trying to make a class and method to do HTTP requests using Dio

class appCommunicate {

  appGetRequest(String url, {headers = ''})
  async {

    if (headers.length > 0) {

      _res =  await dio.get(url, options: Options(headers: headers));
    }
    else
    {
      _res = await dio.get(url);

    }


    return _res;

  }

}

And then when I try to invoke this class as follows:

          final communicate = appCommunicate();
          final response = await communicate.appGetRequest(_myUrl);

Nothing happens, no communication and the app just stops there

dio.get() is venerable for exception. You must add dio.get code in try catch block to handle exception.

appGetRequest(String url, {headers = ''}) async {
    try {
        return (headers.length > 0) ? await dio.get(url, options: Options(headers: headers)) : await dio.get(url);
    }
    catch (e) {
        print(e);
    }
}