Which configuration must be applied to enable re-fetching of cached items based on Cache Headers...

The /enableTTL “1” configuration must be applied to enable re-fetching of cached items based on Cache Headers sent by AEM. This configuration enables the Time To Live (TTL) feature of dispatcher, which allows dispatcher to check the Cache-Control and Expires headers of the cached files and re-fetch them from AEM if they are expired. References:https://experienceleague.adobe.com/docs/experience-manager-dispatcher/using/configuring/page-invalidation.html?lang=en#time-based-cache-invalidation