public class Startup
{
    public void Configuration(IAppBuilder app)
    {
        var webApiConfiguration = ConfigureWebApi();

        // Use the extension method provided by the WebApi.Owin library:
        app.UseWebApi(webApiConfiguration);
    }


    private HttpConfiguration ConfigureWebApi()
    {
        var config = new HttpConfiguration();
        config.Routes.MapHttpRoute(
            "DefaultApi",
            "api/{controller}/{id}",
            new { id = RouteParameter.Optional });
        return config;
    }
}