使用Tls11 C＃读取HttpWebResponse

Question

我正在尝试使用C＃向网站发出POST请求。 我先试过这段代码：

                byte[] buffer = Encoding.UTF8.GetBytes(postData);
                HttpWebRequest WebReq = (HttpWebRequest)WebRequest.Create("https://www.foo.com");


                WebReq.Method = "POST";
                WebReq.Accept = "*/*";
                WebReq.Headers.Add("Accept-Encoding","gzip, deflate");
                WebReq.UserAgent = "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36";
                WebReq.ContentType = "application/x-www-form-urlencoded";
                WebReq.ContentLength = buffer.Length;

                Stream PostData = WebReq.GetRequestStream();
                PostData.Write(buffer, 0, buffer.Length);
                PostData.Close();
                HttpWebResponse WebResp = (HttpWebResponse)WebReq.GetResponse();
                Stream Answer = WebResp.GetResponseStream();
                StreamReader _Answer = new StreamReader(Answer);
                String reply = _Answer.ReadToEnd();
                //do some tasks on reply 

事实证明，这总是会返回此错误：“基础连接已关闭......”

我发现这是因为该网站只接受TLS。所以我在代码的开头添加了这个：

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls11;

该网站接受了该请求，但现在我无法读取我收到的响应，它被加密为类似的内容：

��;ks�J���+&�$�� zYK)�NN�{������TJ5� � ��`���o�H �؎]��(K0��~�>~|����}NbL?��ϾG^='�/�����~<�k$��|��P�

我需要在响应上执行一些任务，所以我需要在代码中解密它...我很开心！提前谢谢！