To demo traffic-percent 50%

Author: geshan

routes/index.js

@@ -3,7 +3,7 @@ var router = express.Router();
 
 /* GET home page. */
 router.get('/', function(req, res, next) {
-  res.json({message: 'alive'});
+  res.json({message: 'alive - 50'});
 });
 
 module.exports = router;