'aborted' 事件

每当 Http2ServerRequest 实例在通信中途异常中止时，就会触发 'aborted' 事件。

只有在 Http2ServerRequest 可写端尚未结束时才会触发 'aborted' 事件。

The 'aborted' event is emitted whenever a Http2ServerRequest instance is abnormally aborted in mid-communication.

The 'aborted' event will only be emitted if the Http2ServerRequest writable side has not been ended.