headless_cms-1.0.3/modules/headless_cms_preview/headless_cms_preview.routing.yml

route_callbacks:
  - '\Drupal\headless_cms_preview\Routing\Routes::routes'

headless_cms_preview.settings:
  path: '/admin/config/headless-cms/preview'
  defaults:
    _form: Drupal\headless_cms_preview\Form\HeadlessCmsPreviewSettingsForm
    _title: 'Headless CMS - Preview'
  requirements:
    _permission: 'administer headless_cms settings'