react-router.jsx

render() {
  return (
    <Router>
      <Switch>
	<Route exact path="/" 
		render={() => <Redirect to="/one" />} />
	<Route exact path="/one" component={Lorem} />
	<Route exact path="/two" component={Lorem} />
	<Route exact path="/three" component={Lorem} />
	<Route component={NotFound} />
      </Switch>
    </Router>
  );
}