@GET
    public Set<String> getTunnelUUIDs() {
        return session.getTunnels().keySet();
    }
Returns the UUIDs of all tunnels exposed by this
TunnelCollectionResource.

@return
    A set containing the UUIDs of all tunnels exposed by this
    TunnelCollectionResource.
guacamole/src/main/java/org/apache/guacamole/rest/tunnel/TunnelCollectionResource.java