ASP.NET Core
A set of technologies in the .NET Framework for building web applications and XML web services.
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HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://xxx.com");
//request.UserAgent = "Mozilla/5.0
request.Method = "GET";
request.Timeout = 2000;
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
if (response.StatusCode == HttpStatusCode.OK)
{
var ret = request.ServicePoint.Certificate;
}