whitelabel-8.x-2.x-dev/tests/modules/whitelabel_test/whitelabel_test.routing.yml

whitelabel_test.set:
  path: '/whitelabel-test/set/{test_value}'
  defaults:
    _title: 'Set white label value'
    _controller: '\Drupal\whitelabel_test\Controller\WhiteLabelTestController::set'
  options:
    no_cache: TRUE
    converters:
      test_value: '\s+'
  requirements:
    _access: 'TRUE'