I am working on a Node app that uses Express. In this app, I have the following:

```
app.use('/', function(req, res) {
  res.render('index', {});            
}); 

```

This route works fine for the positive case. However, it fails for the negative case. For example, If I visit "<http://www.example.com/404>", I still see the index page. In reality, I want it to fall through so that the Express Error handler tackles the error. 

How do I change my route so that when a person visits the root of my app, they see the home page. yet, if they enter anything else, they'll see the 404 page?