放到服务器ServerCertificateCustomValidationCallback就报错

[userlm]

Code:30336909-be5a-47bd-8efd-055bc6a5dbab Key:RestCommon Detail:基类请求出错，错误信息：Method not found: 'Void System.Net.Http.HttpClientHandler.set_ServerCertificateCustomValidationCallback(System.Func`5<System.Net.Http.HttpRequestMessage,System.Security.Cryptography.X509Certificates.X509Certificate2,System.Security.Cryptography.X509Certificates.X509Chain,System.Net.Security.SslPolicyErrors,Boolean>)'.