loadFromUrlIntoKey method
Implementation
Future<NUIGlobalConfig> loadFromUrlIntoKey(String url, String key, {Map<String, String>? queryParameters, Map<String, String>? headers}) async {
Map<String, dynamic> configAsMap = await _getFromUrl(url, queryParameters: queryParameters, headers: headers);
_appConfig.putIfAbsent(key, () => configAsMap);
return this;
}