examples-3.x-dev/modules/tablesort_example/tablesort_example.routing.yml

tablesort_example.description:
  path: '/examples/tablesort-example'
  defaults:
    _controller: '\Drupal\tablesort_example\Controller\TableSortExampleController::description'
  requirements:
    _permission: 'access content'
  options:
    no_cache: 'TRUE'