事件：'finish'

¥Event: 'finish'

当发送请求时触发。更具体地说，当请求标头和请求体的最后一个部分已交给操作系统以通过网络传输时，将触发此事件。这并不意味着服务器已经收到任何东西。

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