protected virtual async Task WriteResponseAsync(HttpResponseMessage response, IOutputStream os)
{
if (response.Content == null && EnforceHtmlResponseBody)
response.Content = CreateHtmlResponse(response.StatusCode);
using (Stream resp = os.AsStreamForWrite()) {
string header = response.ToHeaderString();
byte[] headerArray = Encoding.UTF8.GetBytes(header);
await resp.WriteAsync(headerArray, 0, headerArray.Length);
if (response.Content != null)
await response.Content.CopyToAsync(resp);
await resp.FlushAsync();
}
}