-- newServer({address="2001:4860:4860::8888", qps=1})
-- newServer({address="2001:4860:4860::8844", qps=1})
-- newServer({address="2620:0:ccc::2", qps=10})
-- newServer({address="2620:0:ccd::2", name="dns1", qps=10})
-- newServer("192.168.1.2")
-- setServerPolicy(firstAvailable) -- first server within its QPS limit