As decided in DSpace 7 development, the DSpace v4-6 REST API (i.e. the old REST API or "rest" webapp in versions 4.x-6.x) is deprecated in version 7.x. All tools should move to using the new REST API ("server" webapp in version 7.x)
This ticket is a reminder that this old REST API will be removed from the 8.0 release. This ticket is logged as a "blocker" as it will need to be resolved prior to the 8.0 release.