api_base_helper.dart

class ApiBaseHelper {
  
final String _baseUrl = "http://api.themoviedb.org/3/";
  
Future<dynamic> get(String url) async {
    var responseJson;
    try {
      final response = await http.get(_baseUrl + url);
      responseJson = _returnResponse(response);
    } on SocketException {
      throw FetchDataException('No Internet connection');
    }
    return responseJson;
}

dynamic _returnResponse(http.Response response) {
  switch (response.statusCode) {
    case 200:
      var responseJson = json.decode(response.body.toString());
      print(responseJson);
      return responseJson;
    case 400:
      throw BadRequestException(response.body.toString());
    case 401:
    case 403:
      throw UnauthorisedException(response.body.toString());
    case 500:
    default:
      throw FetchDataException(
          'Error occured while Communication with Server with StatusCode : ${response.statusCode}');
  }
  
}