The Dispatcher Flush replication agent on the AEM publish instance must send invalidation requests to the correct Dispatcher farm. To target a farm, use the URI property of the Dispatcher Flush replication agent (on the Transport tab). Include the value of the /virtualhost property for the Dispatcher farm that is configured for invalidating the cache:
https://*webserver_name*:*port*/*virtual_host*/dispatcher/invalidate.cache
For example, to use the farm_flush farm of the previous example, the URI is
https://localhost:80/invalidation_only/dispatcher/invalidate.cache
For Dispatcher Flush agents, the URI property is used only if you use path-based virtualhost entries to differentiate between farms. You use this field to target the farm to invalidate. For example, farm #1 has a virtual host of
www.mysite.com/path1/* and farm #2 has a virtual host of www.mysite.com/path2/* . You can use a URL of /path1/invalidate.cache to target the first farm and /path2/invalidate.cache to target the second farm.
More details at [1]
[1] https://docs.adobe.com/content/help/en/experience-manager-dispatcher/using/configuring/page-invalida...
https://docs.adobe.com/content/help/en/experience-manager-dispatcher/using/configuring/dispatcher-do...
