Avoid double qs parsing?

```jsx
  createServer((req, res) => {
    const { pathname, query } = parse(req.url, true)

    if (pathname === '/a') {
      app.render(req, res, '/b', query)
    } else if (pathname === '/b') {
      app.render(req, res, '/a', query)
    } else {
      handle(req, res)
    }
  })
```

I think `handle` should admit `query` as a param to avoid double-parsing?