static void MockUp(out HttpKeepAliveService service, out Mock <IWatchDog> mockWatchDog)
        {
            var httpSettings = HttpSettings.Default;

            httpSettings.MaxKeepAliveConnectionsGlobally = 10;
            mockWatchDog = new Mock <IWatchDog>();
            mockWatchDog
            .Setup(inst => inst.Watch(It.IsAny <IDisposable>()))
            .Returns(Mock.Of <IWatchDogSession>());
            service = new HttpKeepAliveService(mockWatchDog.Object, httpSettings);
        }
 static void MockUp(out HttpKeepAliveService service) => MockUp(out service, out _);