When your setup is like: subdomain.customerdomain.com -> fallback.domain.com, Worker Routes sees th
When your setup is like:
subdomain.customerdomain.com -> fallback.domain.com, Worker Routes sees the incoming request as "subdomain.custerdomain.com/" and thus fallback.domain.com/* wouldn't match. You need a wildcard as per this guide: https://developers.cloudflare.com/cloudflare-for-platforms/cloudflare-for-saas/start/advanced-settings/worker-as-origin/ just be careful to exclude your own subdomains first or use a dedicated domain/zone for cf for saas
Cloudflare Docs
Workers as your fallback origin | Cloudflare for Platforms docs
Learn how to use a Worker as the fallback origin for your SaaS zone.
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