Workers as your fallback origin
service.example.com AAAA 100::
In that same zone, navigate to Workers Routes.
Click Add route.
Decide whether you want traffic bound for your SaaS zone (
example.com) to go to that Worker:
If yes, set the following values:
*/*(routes everything — including custom hostnames — to the Worker).
- Worker: Select the Worker used for your SaaS application.
If no, set the following values:
*.<zonename>.com/*(only routes custom hostname traffic to the Worker)
- Worker: None