local sock = ngx.socket.tcp()local ok,err =sock:connect('192.168.3.199',60006)if not ok thenngx.say("failed to connect to connect: ", err)returnendlocal bytes, err = sock:send("aaabbb")ngx.say(bytes)现在是这样写的,但是如果服务端有密码的话,该怎样链接?