there's a guide for workers: https://developers.cloudflare.com/cloudflare-for-platforms/cloudflare-f
there's a guide for workers: https://developers.cloudflare.com/cloudflare-for-platforms/cloudflare-for-saas/start/advanced-settings/worker-as-origin/
Cloudflare Docs
Learn how to use a Worker as the fallback origin for your SaaS zone.