I am encountering an intermittent FormatException with the message “Unexpected end of input” when fetching data from an API using the Dio library in a Flutter application. This exception does not occur consistently; sometimes I get the correct data, and other times this error occurs.

DioException (DioException [unknown]: null
Error: FormatException: Unexpected end of input (at character 3247)
...2024-05-06T15:00:41.000000Z","updated_at":"2024-05-07T08:51:56.000000Z"}}}]

here is my repository

  Future<ApiResult<AppointmentsResponse>> getAppointments() async {
final dio = Dio();

dio.interceptors.add(LogInterceptor(responseBody: true));
dio.interceptors.add(LogInterceptor(requestBody: true));

try {
  final prefs = await SharedPreferences.getInstance();
  final String? stored_token = await prefs.getString('token');
  final int? tech_id = await prefs.getInt('tech_id');

  final dio = DioFactory.getDio();

  final response = await dio.get(
      '$baseurl/api/appointments/tech/$tech_id/all',
      options: Options(
        headers: {'Authorization': 'Bearer $stored_token'},
      ));

  debugPrint("Raw API Response: $response");

  debugPrint('Response: ${response.statusCode}');
  debugPrint("response11: ${response.data}");

  // Process your response data here
  Map<String, dynamic> responseData = response.data is Map<String, dynamic>
      ? response.data
      : jsonDecode(response.data);
  return ApiResult.success(AppointmentsResponse.fromJson(responseData));
} catch (e, stacktrace) {
  logger.e("Error: $e, StackTrace: $stacktrace");
  return ApiResult.failure(e.toString());
}

}

I also have this in my bloc provider

 BlocProvider<AppointmentCubit>(
        create: (BuildContext context) => AppointmentCubit(AppointmentRepo(
            apiService: ApiService(Dio(BaseOptions(
          headers: {
            'Content-Type': 'application/json',
            'Accept': 'application/json',
          },
          followRedirects: false,
          // // will not throw errors
          validateStatus: (status) => true,
        ))))),
      ),