Workers as your fallback origin

If you are building your application on Cloudflare Workers, you can use a Worker as the origin for your SaaS zone (also known as your fallback origin).

1. In your SaaS zone, create and set a fallback origin. Ensure the fallback origin only has an originless DNS record:

   • Example: service.example.com AAAA 100::

2. In that same zone, navigate to Workers Routes.

3. Click Add route.

4. Decide whether you want traffic bound for your SaaS zone (example.com) to go to that Worker:

   • If yes, set the following values:

     • Route: */* (routes everything — including custom hostnames — to the Worker).
     • Worker: Select the Worker used for your SaaS application.

   • If no, set the following values:

     • Route: *.<zonename>.com/* (only routes custom hostname traffic to the Worker)
     • Worker: None

5. Click Save.