HTTP/2 request with client certificate sample code

My sample code:

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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading.Tasks;

namespace TestHTTP2
{
    class Program
    {
        static async Task Main(string[] args)
        {
            X509Certificate2 clientCert = GetClientCertificate();
            Http2CustomHandler requestHandler = new Http2CustomHandler();
            requestHandler.ClientCertificates.Add(clientCert);

            using (var httpClient = new HttpClient(requestHandler))
            {
                //client.BaseAddress = new Uri(https://www.bing.com/);
                
                HttpResponseMessage response = await httpClient.GetAsync(@https://jackyclientcer21.azurewebsites.net/);
                
                if (response.IsSuccessStatusCode)
                {
                    Console.WriteLine("HTTP2 is success!!");
                }
                else
                {
                    Console.WriteLine(response.StatusCode);
                    Console.WriteLine(response.Content);
                }
            }
            Console.ReadLine();
        }

        private static X509Certificate2 GetClientCertificate()
        {
            X509Store userCaStore = new X509Store(StoreName.My, StoreLocation.CurrentUser);
            try
            {
                //X509Store store = new X509Store(StoreName.My, StoreLocation.CurrentUser);

                userCaStore.Open(OpenFlags.ReadOnly);
                X509Certificate2 clientCertificate = null;
                foreach (X509Certificate2 certificate in userCaStore.Certificates)
                {
                    if (certificate != null)
                    {
                        Console.WriteLine(certificate.Subject);
                        Console.WriteLine(certificate.Thumbprint);
                        clientCertificate = certificate;
                        break;
                    }
                }

                return clientCertificate;
            }
            catch
            {
                throw;
            }
            finally
            {
                userCaStore.Close();
            }
        }
    }

    public class Http2CustomHandler : WinHttpHandler
    {
        protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)
        {
            request.Version = new Version("2.0");
            return base.SendAsync(request, cancellationToken);
        }
    }
}

HTH. 2021-2-9 by Jacky