c# https请求

        public static string RequestWebServerByTCP(Uri uri, string method, NameValueCollection parameter, string cookie, Encoding encoding)
        {
            try
            {
                StringBuilder RequestHeaders = new StringBuilder();

                RequestHeaders.Append(method + " " + uri.PathAndQuery + " HTTP/1.1\r\n");

                method = method.ToUpper();

                if (method == POSTMETHOD)
                    RequestHeaders.Append("Content-Type:application/x-www-form-urlencoded\r\n");
                RequestHeaders.Append("User-Agent:Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.64 Safari/537.11\r\n");
                RequestHeaders.Append("Cookie:" + cookie + "\r\n");
                RequestHeaders.Append("Accept:*/*\r\n");
                RequestHeaders.Append("Host:" + uri.Host + "\r\n");


                byte[] postdata = null;
                StringBuilder sb = new StringBuilder();

                if (method == GETMETHOD)
                {
                    uri = GetMethodQueryString(uri, parameter, encoding);
                }
                else if (method == POSTMETHOD)
                {
                    if (parameter != null)
                    {
                        foreach (string key in parameter)
                        {
                            sb.Append(string.Format(FORMATSTR1, System.Web.HttpUtility.UrlEncode(key, encoding), System.Web.HttpUtility.UrlEncode(parameter[key], encoding)));
                        }
                    }
                    if (sb.Length != 0)
                    {
                        sb = sb.Remove(sb.Length - 1, 1);
                    }
                    postdata = encoding.GetBytes(sb.ToString());

                    RequestHeaders.Append("Content-Length:" + postdata.Length + "\r\n");
                }

                RequestHeaders.Append("Connection:close\r\n\r\n");
                byte[] req = Encoding.UTF8.GetBytes(RequestHeaders.ToString() + sb.ToString());


                int port = 443;

                MyTlsClient client = new MyTlsClient();
                var protocol = OpenTlsConnection(uri.Host, port, client);

                Stream tlsStream = protocol.Stream;
                tlsStream.Write(req, 0, req.Length);
                tlsStream.Flush();

                StreamReader reader = new StreamReader(tlsStream);

                String line;
                StringBuilder html = new StringBuilder();

                string firstLine = "";

                int i = 0;

                while ((line = reader.ReadLine()) != null)
                {
                    if (i == 0)
                    {
                        firstLine = line;
                        i++;
                    }

                    html.AppendLine(line);

                    if (line.Contains("