route_ui-1.0.0-alpha2/route_ui.routing.yml

route_ui.route_names.autocomplete:
  path: '/custom-access-links/routes/{user_token}'
  defaults:
    _controller: '\Drupal\route_ui\Controller\AutocompleteController::handleAutocomplete'
  options:
    no_cache: TRUE
  requirements:
    # @todo Access is handled in the controller at the moment. Move to a custom
    #   access provider so we can cache the responses.
    _access: 'TRUE'
    _csrf_token: 'TRUE'