public class Startup
{
    public void Configuration(IAppBuilder app)
    {
        var config = new HttpConfiguration();

        config.MapHttpAttributeRoutes();
        config.Routes.MapHttpRoute(
            name: "Regular Route",
            routeTemplate: "api/{controller}/{action}/{id}",
            defaults: new { id = RouteParameter.Optional }
        );

        config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { id = RouteParameter.Optional }
        );

        app.UseWebApi(config);
    }
}

public class HomeController : ApiController
{
    public IHttpActionResult GetStatus()
    {
        return Ok();
    }
}