'session' 事件
session<ServerHttp2Session>
当 Http2Server 创建新的 Http2Session 时，则会触发 'session' 事件。
session<ServerHttp2Session>
The 'session' event is emitted when a new Http2Session is created by the
Http2Server.
session <ServerHttp2Session>当 Http2Server 创建新的 Http2Session 时，则会触发 'session' 事件。
session <ServerHttp2Session>The 'session' event is emitted when a new Http2Session is created by the
Http2Server.