Can I add a custom domain to a webapp and later change it

Question

Can I add a custom domain to a webapp and later change it so that the same url is used for a function ?

I mean, initially mount a web service in an app service and later migrate it to azure function and keep the same url of the service

Answer 1

Just like you followed https://learn.microsoft.com/en-us/azure/app-service/app-service-web-tutorial-custom-domain?tabs=cname to bind the custom domain to the app service, you would remove the custom domain and CNAME and/or A records from your DNS registrar that was pointing your app service and perform the same documented steps to bind your existing domain to the app service.

The only contention I can think of is the use of consumption plan. I checked the docs and there isn't any listed limitation using a custom domain with consumption plan, but just food for thought.