Response Interceptor

dynamic responseInterceptor(Response options) async {
  if (options.headers.value("verifyToken") != null) {
    //if the header is present, then compare it with the Shared Prefs key
    SharedPreferences prefs = await SharedPreferences.getInstance();
    var verifyToken = prefs.get("VerifyToken");
    
    // if the value is the same as the header, continue with the request
    if (options.headers.value("verifyToken") == verifyToken) {
      return options;
    }
  }

  return DioError(request: options.request, message: "User is no longer active");
}