SignalR with Xamarin NSUrlSessionHandler

SignalR.cs

var connection = new HubConnection("http://yourserver.com/signalr");
await connection.Start(new ServerSentEventsTransport(new NativeHttpClient()));

//And NativeHttpClient
public class NativeHttpClient : DefaultHttpClient
{
  protected override HttpMessageHandler CreateHandler()
  {
    return new NSUrlSessionHandler();
  }
}