Asp .Net Core 2 + SignalR (1.0.0-alpha2-27025) + /signalr/negotiate 404 Error

I add SignalR to ASP .Net Core 2 app

packages

• "Microsoft.AspNetCore.All" Version="2.0.0"
• "Microsoft.AspNetCore.SignalR" Version="1.0.0-alpha2-27025"
• "Microsoft.AspNetCore.SignalR.Client" Version="1.0.0-alpha2-27025"
• "Microsoft.AspNetCore.SignalR.Client.Core" Version="1.0.0-alpha2-27025"
• "Microsoft.AspNetCore.SignalR.Common" Version="1.0.0-alpha2-27025"
• "Microsoft.AspNetCore.SignalR.Core" Version="1.0.0-alpha2-27025"

public IServiceProvider ConfigureServices(IServiceCollection services)
{
    services.AddSignalRCore();
    services.AddSignalR();
}

and

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory, IServiceProvider serviceProvider)
    app.UseSignalR(routes =>
    {
        routes.MapHub<ManageHub>("manageHub");
    });
}

url:port/signalr, url:port/signalr/negotiate... return 404

url:port/manageHub return 400 with "Connection ID required"

I not found .MapSignalR()

How use SignalR in ASP .Net Core?