Request Interceptor for certain endpoints

dynamic requestInterceptor(RequestOptions options) async {
  if (options.headers.containsKey("requiresToken")) {
    //remove the auxiliary header
    options.headers.remove("requiresToken");

    SharedPreferences prefs = await SharedPreferences.getInstance();
    var header = prefs.get("Header");

    options.headers.addAll({"Header": "$header${DateTime.now()}"});
    
    return options;
  }
}