http2session.encrypted
如果 Http2Session 会话套接字尚未连接,则值为 undefined,如果 Http2Session 与 TLSSocket 连接,则值为 true,如果 Http2Session 连接到任何其他类型的套接字或流,则值为 false。
¥Value is undefined if the Http2Session session socket has not yet been
connected, true if the Http2Session is connected with a TLSSocket,
and false if the Http2Session is connected to any other kind of socket
or stream.