解决方案，添加证书忽略
1 HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
2 request.ServerCertificateValidationCallback = (_s, _x509s, _x509c, _ssl) => { return (true); };
3 HttpWebResponse response = (HttpWebResponse)request.GetResponse();
标签：core,established,request,HttpWebResponse,WebRequest,报错,net From： https://www.cnblogs.com/real9527/p/17030336.html