Как правильно скачивать страницы https?

using System;
using System.Net.Http;
using System.Threading.Tasks;
using System.IO;
using System.Net.Http.Headers;
using System.Net;

class Program
{
    static void Main()
    {
        Task t = new Task(DownloadPageAsync);
        t.Start();
        Console.WriteLine("Downloading page...");
        Console.ReadLine();
    }

    static async void DownloadPageAsync()
    {
        //string page = "https://www.linux.org.ru/forum/development/";
        string page = "https://www.blablacar.ru/user/show/f9037f00-7820-11e4-a000-0003efced283";

        HttpClientHandler handler = new HttpClientHandler()
        {
            AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate
        };
        using (HttpClient client = new HttpClient(handler))
        {
            client.DefaultRequestHeaders.Add("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/apng,*/*;q=0.8");
            client.DefaultRequestHeaders.AcceptEncoding.Add(new StringWithQualityHeaderValue("gzip"));
            client.DefaultRequestHeaders.AcceptEncoding.Add(new StringWithQualityHeaderValue("deflate"));
            client.DefaultRequestHeaders.Add("Accept-Language", "en-GB,en;q=0.9,en-US;q=0.8");
            client.DefaultRequestHeaders.Add("Connection", "keep-alive");
            client.DefaultRequestHeaders.Add("Cache-Control", "no-cache");
            client.DefaultRequestHeaders.Add("Pragma", "no-cache");
            client.DefaultRequestHeaders.Add("User-Agent", "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko; Google Page Speed Insights) Chrome/27.0.1453 Safari/537.36");
            using (HttpResponseMessage response = await client.GetAsync(page))
            {
                using (HttpContent content = response.Content)
                {
                    string result = await content.ReadAsStringAsync();

                    File.WriteAllText("test.html", result);
                    Console.WriteLine("Done!");
                }
            }
        }
    }
}