事件：'finish'

【Event: 'finish'】

当响应已发送时触发。更具体地说，当响应头和响应体的最后一部分已交给操作系统以通过网络传输时，将触发此事件。这并不意味着客户端已经收到任何内容。

【Emitted when the response has been sent. More specifically, this event is emitted when the last segment of the response headers and body have been handed off to the operating system for transmission over the network. It does not imply that the client has received anything yet.】