<PackageReference Include="NETStandard.Library" Version="2.0.0-preview2-25401-01" />

System.Net.Authorization

public class Authorization
namespace System.Net { public class Authorization { public bool Complete { get; } public string ConnectionGroupId { get; } public string Message { get; } public bool MutuallyAuthenticated { get; set; } public string[] ProtectionRealm { get; set; } public Authorization(string token); public Authorization(string token, bool finished); public Authorization(string token, bool finished, string connectionGroupId); } }