I'm trying to create app links between a Confluence and a JIRA. For local reasons, both of them live behind the same load balancer, which means that neither of them can talk to the other via their external URLs. The application link creation wizard lets me specify different "real" and display URLs for the target application, but not the source application. Which means that the operation fails when the target tries to redirect back to the source.
So how do I create an application link where both sides need different real and display URLs?