'lookup' 事件

在找到主机之后创建连接之前触发。不可用于 UNIX socket。

• err <Error> | <null> 错误对象。查看 dns.lookup()。
• address <string> IP 地址。
• family <string> | <null> 地址类型。查看 dns.lookup()。
• host <string> 主机。

Emitted after resolving the hostname but before connecting. Not applicable to UNIX sockets.

• err <Error> | <null> The error object. See dns.lookup().
• address <string> The IP address.
• family <string> | <null> The address type. See dns.lookup().
• host <string> The hostname.