betasite-1.0.4/modules/betasite_toggle_block/betasite_toggle_block.routing.yml

betasite_toggle_block.toggle_link_ajax:
  path: '/beta-link'
  defaults:
    _controller: '\Drupal\betasite_toggle_block\Controller\BetaToggleLinkController::getToggleLink'
    _title: 'Beta link AJAX response'
  requirements:
    _access: 'TRUE'