# Microsoft.AspNetCore.Server.HttpSys

``` diff
 namespace Microsoft.AspNetCore.Server.HttpSys {
+    public enum ClientCertificateMethod {
+        AllowCertificate = 1,
+        AllowRenegotation = 2,
+        NoCertificate = 0,
+    }
     public class HttpSysOptions {
+        public ClientCertificateMethod ClientCertificateMethod { get; set; }
     }
 }
```

