GetStreamAsync CopyTo sometimes returns zero bytes [closed]

I have the following routine that downloads a file from a web server. Sometimes the local file is created, but is zero bytes. I am [almost] certain the remote resource exists.

private static void DownloadFile(string strUrl, string strLocalFile) { using (var client = new HttpClient()) { using (var httpClient = new HttpClient()) { using (var streamAsync = httpClient.GetStreamAsync(strUrl)) { using (var fileStream = new FileStream(strLocalFile, FileMode.OpenOrCreate)) { streamAsync.Result.CopyTo(fileStream); } } } } }