using System;

using System.IO;

using System.Linq;

using System.Net;

using System.Text;

using System.Threading.Tasks;

​

namespace ConsoleAppCore1

{

    public class Program

    {

        public static void Main(string[] args)

        {

            ServicePointManager.Expect100Continue = true;

            ServicePointManager.ServerCertificateValidationCallback = (sender, certificate, chain, sslPolicyErrors) => true;

​

            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | SecurityProtocolType.Tls11 |

                SecurityProtocolType.Tls12 | (SecurityProtocolType)12288;

​

            var webRequest = (HttpWebRequest)WebRequest.Create("https://shop.blackanddecker.ru/yandexmarket/index/bd");

            webRequest.ServerCertificateValidationCallback = (sender, certificate, chain, sslPolicyErrors) => true;

            webRequest.Method = "GET";

            //            webRequest.Accept = "text/html, application/xhtml+xml, application/xml, gzip, deflate, br, application/x-rar-compressed, application/octet-stream, application/zip; q=0.9,image/webp,*/*;q=0.8";

            //            webRequest.UserAgent = "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:77.0) Gecko/20100101 Firefox/77.0";

            //webRequest.AddRange(0);

​

            using (var webResponse = (HttpWebResponse)webRequest.GetResponse())

            {

                using (var responseStream = webResponse.GetResponseStream())

                {

using (var tr = new StreamReader(responseStream))

       {

       Console.WriteLine(tr.ReadToEnd());

       }

                }

            }

        }

    }

}

​