home_route:
   path:     /
   defaults: { controller: 'FooController::indexAction' }
 
 foo_route:
   path:     /foo
   defaults: { controller: 'FooController::indexAction' }
 
 foo_placeholder_route:
   path:     /foo/{id}
   defaults: { controller: 'FooController::loadAction' }
   requirements:
     id: '[0-9]+'