For global external Application Load Balancers, you can configure Cloud CDN cache policies at various levels of a URL...

For global external Application Load Balancers, you can configure Cloud CDN cache policies at various levels of a URL map, providing more granular control over caching. You can now apply specific caching logic based on hostnames, URL paths, HTTP headers, and query parameters. This feature is in Preview.

For more information, see Cache policies in URL maps.