ConfigureServices.cs

public void ConfigureServices(IServiceCollection services)
{
    services.AddAuthentication(options =>
    {
        // these must be set other ASP.NET Core will throw exception that no
        // default authentication scheme or default challenge scheme is set.
        options.DefaultAuthenticateScheme =
                CookieAuthenticationDefaults.AuthenticationScheme;
        options.DefaultChallengeScheme =
                CookieAuthenticationDefaults.AuthenticationScheme;
    })
    .AddCookie();

    services.AddMvc(options => options.Filters.Add(new
                     RequireHttpsAttribute()));
}