事件：'lookup'

¥Event: 'lookup'

在解析主机名之后但在连接之前触发。不适用于 Unix 套接字。

¥Emitted after resolving the host name but before connecting. Not applicable to Unix sockets.

• err <Error> | <null> 错误对象。参见 dns.lookup()。

  ¥err <Error> | <null> The error object. See dns.lookup().

• address <string> IP 地址。

  ¥address <string> The IP address.

• family <number> | <null> 地址类型。参见 dns.lookup()。

  ¥family <number> | <null> The address type. See dns.lookup().

• host <string> 主机名。

  ¥host <string> The host name.