Federation
Multiple instances can reach each other by using their instance name as domain name to allow for testing federation between instances.
For example, if you have a rover-beavers and splendid-couch instance, you
can create a federated share from the rover-beavers instance to
http://admin@splendid-couch.
If the proxy is setup with https, you can use https between the instances by using the full proxy urls.
For example sharing to admin@splendid-couch.haze.example.com.