Basic Authentication not work

[maza70]

Can't use the http Basic-Authentication the statuscode is always System.Net.HttpStatusCode.Unauthorized.
With the normal MessageHandler the code works.
How to use the http Basic Authentification?

Thanks for your support!

Sample Code:

try
{
	var tlsConfig = new TLSConfig()
	{
		DangerousAcceptAnyServerCertificateValidator = true,
		Pins = new List<Pin>()
				{
					new Pin()
					{
						Hostname = "*",
						PublicKeys=new string[]{ }
					}
				}

	};
	var handler = new NativeMessageHandler(false, tlsConfig);

	HttpClient client = new HttpClient(handler);

	var webdavUrl = new Uri("https://ubuntu/remote.php/dav/files/zpush");
	var passwordCache = new CredentialCache();
	passwordCache.Add(webdavUrl, "Basic", new NetworkCredential("xxx", "secret"));
	handler.Credentials = passwordCache;
	handler.UseDefaultCredentials = false;
	handler.PreAuthenticate = true;


	var request = new HttpRequestMessage(new HttpMethod("PROPFIND"), webdavUrl);
	var response = await client.SendAsync(request, HttpCompletionOption.ResponseContentRead).ConfigureAwait(false);
	var satuscode = response.StatusCode;

}
catch (Exception ex)
{
	Console.WriteLine(ex.ToString());
}