aggregator-2.x-dev/tests/modules/aggregator_test/aggregator_test.routing.yml

aggregator_test.feed:
  path: '/aggregator/test-feed/{use_last_modified}/{use_etag}'
  defaults:
    _controller: '\Drupal\aggregator_test\Controller\AggregatorTestRssController::testFeed'
    _title: 'Test feed static last modified date'
    use_last_modified: FALSE
    use_etag: FALSE
  requirements:
    _access: 'TRUE'

aggregator_test.redirect:
  path: '/aggregator/redirect/{status_code}'
  defaults:
    _controller: '\Drupal\aggregator_test\Controller\AggregatorTestRssController::testRedirect'
    _title: 'Test feed with a redirect'
  requirements:
    _access: 'TRUE'