@Override
    public Set<DataForm> getExtendedInfos(String name, String node, JID senderJID) {
        return new HashSet<>();
    }
Returns the fully-qualifed domain name of this chat service.
The domain is composed by the service name and the
name of the XMPP server where the service is running.

@return the file transfer server domain (service name + host name).
xmppserver/src/main/java/org/jivesoftware/openfire/mediaproxy/MediaProxyService.java