public override async Task <string> GetPlaceHolderHtmlAsync()
{
var requestUri = $"{_fragmentInfo.Source}/{_fragmentInfo.Name}/placeholder";
if (_memoryCache.TryGetValue(requestUri, out string cachedHtml))
{
return(cachedHtml);
}
var placeHolderHtml = await _httpClientProvider.GetAsStringAsync(requestUri);
_memoryCache.Set(requestUri, placeHolderHtml);
return(placeHolderHtml);
}