事件：'trailers'

【Event: 'trailers'】

• headers HTTP/2 头对象 一个描述头信息的对象
• flags <number> 相关的数字标志

当接收到与尾随头字段相关的头块时，会触发 'trailers' 事件。监听器回调会接收到与这些头关联的 HTTP/2 头部对象 和标志。

【The 'trailers' event is emitted when a block of headers associated with trailing header fields is received. The listener callback is passed the HTTP/2 Headers Object and flags associated with the headers.】

如果在接收到尾部信息之前调用了 http2stream.end()，并且没有读取或监听传入的数据，则此事件可能不会被触发。

【This event might not be emitted if http2stream.end() is called before trailers are received and the incoming data is not being read or listened for.】

stream.on('trailers', (headers, flags) => {
  console.log(headers);
}); 拷贝