Make this domain your app’s main address

The main address is the link people are given for your app, and where its Roar address redirects. Your other domains keep serving the app as they are — nothing else is redirected — and your app’s APP_URL variable does not change. Only a live domain can be chosen. If it later stops answering, the next live address stands in until it does. No body.

id is a DOMAIN id, from GET /client/services/{id}/domains. Requires apps:deploy.