Hello Hooda,
According to the MS Cluster (High Availabilty) Installation you need to have local SAP Innstance on both nodes. Since these instances are local instances they can not be moved to the other node as you may know. (Can be seen below as PAS and AAS).
The switchable part of SAP installations on HA system are DB and SCS services, disks, and virtual DNSs (or IPs). And there must be a virtual DNS name for SAP Services and a virtual DNS name for DB Services.
When we come to your question if your system is installed according to the standart HA installation scenario with below architecture you can use virtual DNS names in URL.
Use URL like below;
http://<virtualDNS for SCS>:port/AdobeDocumentServices/Config?string=rpc
I assume that you are using the same Instance number for PAS and AAS. Otherwise your port number will differ and this sscenario fails.
Regards,
Yuksel AKCINAR