select2-8.x-1.11/modules/select2_facets/select2_facets.routing.yml

select2_facets.facet_autocomplete:
  path: '/select2_facets_autocomplete/{facetsource_id}/{facet_id}/{selection_settings_key}'
  defaults:
    _controller: '\Drupal\select2_facets\Controller\FacetApiAutocompleteController::handleAutocomplete'
  requirements:
    # We are calculating a hash for every request in the widget.
    _access: 'TRUE'