net40-client 
namespace Microsoft.AspNet.SignalR.Client
{
    public interface IConnection
    {
        X509CertificateCollection Certificates { get; }
    }
}
nuget.org
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Reference this API
.NET 5.06.07.08.09.010.0
.NET Core 1.01.12.02.12.23.03.1
.NET Framework 4.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard 1.31.41.51.62.02.1
Information specific to net40-client
Assembly

Microsoft.AspNet.SignalR.Client , Version=2.4.3.0, PublicKeyToken=31bf3856ad364e35

Referencing

Your project needs a package reference to Microsoft.AspNet.SignalR.Client.

Package Microsoft.AspNet.SignalR.Client (2.4.3) net40
Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API