public void TestAddOrReplaceServiceBehavior()
        {
            var host = new System.ServiceModel.ServiceHost(typeof(GeneralTestService));
            host.AddServiceEndpoint(typeof(IGeneralTestService), new BasicHttpBinding(), new Uri("http://localhost:7777/services/extensions"));

            var mdb = new ServiceMetadataBehavior();
            mdb.HttpGetEnabled = true;
            host.AddOrReplaceBehavior<ServiceMetadataBehavior>(mdb);
        }