Nothing stopping you from redirecting a code response redirect from the authorization server. Have a shim server return 302 from `http://localhost/subdomain/oau

Nothing stopping you from redirecting a code response redirect from the authorization server. Have a shim server return 302 from `http://localhost/subdomain/oauth?code= http://localhost/subdomain/oauth?code=...` to `http://subdomain.localhost/oauth?code= http://subdomain.localhost/oauth?code=...` for example.