public class ValuesController : ApiController
{
        public async Task<string> Get(int id)
        {
            var info = string.Format("API CurrentThread:{0}", Thread.CurrentThread.ManagedThreadId);
            var infoTask = await GetCurrentThread();
            var infoTaskFinished = string.Format("After GetCurrentThread:{0}", Thread.CurrentThread.ManagedThreadId);
            return string.Format("{0},{1},{2},{3}", info, infoTask, infoTaskFinished, id);
        }

        private async Task<string> GetCurrentThread()
        {
            await Task.Delay(1500);
            return string.Format("Action CurrentThread:{0}", Thread.CurrentThread.ManagedThreadId);
        }
}

public class Startup
{
    public void Configuration(IAppBuilder MyApp)
    {
            HttpConfiguration config = new HttpConfiguration();
            config.Routes.MapHttpRoute(name: "DefaultApi", routeTemplate: "api/{controller}/{id}",
                defaults: new { id = RouteParameter.Optional }
                );
　　　　　　　MyApp.UseCors(Microsoft.Owin.Cors.CorsOptions.AllowAll);
            MyApp.UseWebApi(config);
    }
}

//window service hosting

public class MyControllersService : ServiceHelper.BaseService
{
        bool isstart = false;
        public MyControllersService() : base("MyControllersService", true) { }

        protected override void MyWork()
        {
            try
            {
                this.OutputLog("MyWork Start", this.ServiceName);
                string address = "http://xxx-services:8081/";
                if(!isstart)
                {
                    WebApp.Start<Startup>(url: address);
                    isstart = true;
                    this.OutputLog("Starting OWIN Host", this.ServiceName);
                }
            }
            catch (Exception err)
            {
                this.OutputLog(CommonHelper.CommonUnit.ExceptionMsg(err), this.ServiceName);
                throw;
            }
            finally
            {
                this.OutputLog("MyWork Stop", this.ServiceName);
            }
　　　　}
}