private void BuildUriForKvRoute(RequestUriBuilder builder, ConfigurationSetting keyValue)
 => BuildUriForKvRoute(builder, keyValue.Key, keyValue.Label);     // TODO (pri 2) : does this need to filter ETag?
        private static async Task <Response <ConfigurationSetting> > CreateResponseAsync(Response response, CancellationToken cancellation)
        {
            ConfigurationSetting result = await ConfigurationServiceSerializer.DeserializeSettingAsync(response.ContentStream, cancellation).ConfigureAwait(false);

            return(Response.FromValue(result, response));
        }