protected override void RequestStartup(TinyIoCContainer container, IPipelines pipelines, NancyContext context)
{
    base.RequestStartup(container, pipelines, context);

    var formsAuthConfiguration =
        new FormsAuthenticationConfiguration()
        {
            DisableRedirect = true,
            UserMapper = container.Resolve<IUserMapper>()
        };

    FormsAuthentication.Enable(pipelines, formsAuthConfiguration);
}