App Engine custom domain with service

Question

I set up a custom domain with App Engine after following the instructions on DNS records:

https://cloud.google.com/appengine/docs/standard/java/mapping-custom-domain

Answer 1

Check how to use subdomains and how wildcard mapping works in the GCP docs here (actually these are the next steps at the website which you've followed and linked). Make sure that your DNS provider permits wildcards in CNAME host entries, otherwise such mapping will not be possible.

This blog post shows a real-life example of matching subdomains to services with App Engine.