无法从nse获取数据

Question

我正在尝试从nse印度获得选项链数据，但是我得到了下面的Exception

An error occurred while sending the request.
Unable to read data from the transport connection:
A connection attempt failed because the connected party did not properly respond after a period of time,
or established connection failed because connected host has failed to respond.

下面是我的代码：

    public string getoptiondata()
            {
                var content = string.Empty;
                try
                {
                string url = "https://www.nseindia.com/api/option-chain-indices?symbol=NIFTY";
                var request = (HttpWebRequest)WebRequest.Create(url);
                request.Method = "GET";
                request.UserAgent = ".NET Framework Test Client";
                request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
          
                using (var response = (HttpWebResponse)request.GetResponse())
                {
                    using (var stream = response.GetResponseStream())
                    {
                        using (var sr = new StreamReader(stream))
                        {
                            content = sr.ReadToEnd();
                        }
                    }
                }
                }
    
                catch(Exception   e)
                {
    
                    using (StreamWriter sw = File.AppendText("`enter code here`ok.txt"))
                    {
                        sw.WriteLine("***********  Exception *********** \n");
                        sw.WriteLine(e.Message);
                    }
               
                }
    
    
                return content;
            }

Answer 1

为SSl/TSL添加以下行：

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;