using System;
using System.Net.Http;
using System.Security.Cryptography.X509Certificates;

namespace HttpClientTests
{
    class Program
    {
        //netstat -an | grep 213
        static void Main(string[] args)
        {
            var httpClientHandler = new HttpClientHandler();
            var httpClient = new HttpClient(httpClientHandler);
            httpClient.BaseAddress = new Uri("https://www.onet.pl");

            httpClientHandler.ClientCertificateOptions = ClientCertificateOption.Manual;

            for (int i = 0; i < 1000; i++)
            {
                var computerCaStore = new X509Store(StoreName.AuthRoot, StoreLocation.CurrentUser);
                computerCaStore.Open(OpenFlags.OpenExistingOnly);

                var clientCertificate = computerCaStore.Certificates[0];
                var clientCertificate1 = computerCaStore.Certificates[1];
                var clientCertificate2 = computerCaStore.Certificates[2];

                httpClientHandler.ClientCertificates.Clear();

                if (i % 3 == 0)
                    httpClientHandler.ClientCertificates.Add(clientCertificate);
                else if (i % 3 == 1)
                    httpClientHandler.ClientCertificates.Add(clientCertificate1);
                else
                    httpClientHandler.ClientCertificates.Add(clientCertificate2);

                httpClient.DefaultRequestHeaders.Clear();

                if (i % 4 == 0)
                    httpClient.DefaultRequestHeaders.Add("x", "y");
                else if (i % 4 == 1)
                    httpClient.DefaultRequestHeaders.Add("x1", "y1");
                else if (i % 4 == 2)
                    httpClient.DefaultRequestHeaders.Add("x2", "y2");
                else
                    httpClient.DefaultRequestHeaders.Add("x3", "y3");

                //httpClient.DefaultRequestHeaders.ConnectionClose = true;

                var response = httpClient.GetAsync("").Result;

                Console.WriteLine(response.StatusCode);
            }
        }
    }
}