System.Net.Http.HttpRequestException: 'Received an invalid status line: 'HTTP/2 200 '.'

here is my code:

using HttpClient client = new HttpClient();

try
{
    HttpResponseMessage response = await client.GetAsync("http://131.189.89.86:11920/SetupWizard.aspx/yNMgLvRtUj");
}
catch (HttpRequestException e)
{
    Console.WriteLine($"Request error: {e.Message}");
}

and it gives me this error: System.Net.Http.HttpRequestException: 'Received an invalid status line: 'HTTP/2 200 '.'

I also tried to downgrade Http Version like this:

var request = new HttpRequestMessage(HttpMethod.Get, "http://131.189.89.86:11920/SetupWizard.aspx/yNMgLvRtUj")
{
    Version = new Version(1, 1)
};
HttpResponseMessage response = await client.SendAsync(request);

but no success.

here is a TCP hack which works even server is broken:

    var host = "131.189.89.86";
    var port = 11920;

    using var client = new TcpClient();
    await client.ConnectAsync(host, port);

    using var stream = client.GetStream();

    // Manually craft an HTTP/1.0 style request
    var request = "GET /SetupWizard.aspx/yNMgLvRtUj HTTP/1.0\r\nHost: 131.189.89.86\r\nConnection: close\r\n\r\n";
    byte[] requestBytes = Encoding.ASCII.GetBytes(request);
    await stream.WriteAsync(requestBytes, 0, requestBytes.Length);

    byte[] buffer = new byte[8192];
    int bytesRead;
    var response = new StringBuilder();

    do
    {
        bytesRead = await stream.ReadAsync(buffer, 0, buffer.Length);
        response.Append(Encoding.ASCII.GetString(buffer, 0, bytesRead));
    } while (bytesRead > 0);

    Console.WriteLine("---- RAW SERVER RESPONSE ----");
    Console.WriteLine(response.ToString());

but how to do it via httpclient? any hack or trick?