A marker annotation to register a rest client at runtime. This marker must be applied to any CDI managed
clients.
Note that the annotated interface indicates a service-centric view. Thus users would invoke methods on
this interface as if it were running in the same VM as the remote service.
Associates the annotated rest client interface with this configuration key. By specifying a non-empty value,
this interface can be configured more simply using the configuration key rather than the fully-qualified class
name of the interface.
Returns:
the configuration key in use by this client interface. An empty value means that this interface is not
associated with a configuration key.