Please ensure that the CDN and Dispatcher configurations allow fetching the page.As per the above error:Do you have the ServerAlias localhost in your vhost? Add those suggested ServerAlias  in the vhost and try again.https://experienceleague.adobe.com/en/docs/experience-manager-cloud-service/content...

AEM documentation and troubleshooting refer specifically to correct handling of virtual hosts and hostname/redirect processing:For multi-domain setups, you must ensure that your RewriteRule or redirection keeps the original hostname Using the Dispatcher with Multiple DomainsCloud 5 - Fix Your... Rew...

Caching strategies in the CDN vs. Dispatcher should be deliberate, and the answer changes depending on your operational needs for control, efficiency, and team agility.Where to Set Caching—CDN vs DispatcherDispatcherBest for:Fine-grained, quickly adjustable control (paths, TTLs, headers)Security fil...