http2session.alpnProtocol


如果 Http2Session 尚未连接到套接字,则值为 undefined,如果 Http2Session 未连接到 TLSSocket,则值为 h2c,或者将返回已连接的 TLSSocket 自己的 alpnProtocol 属性的值。

Value will be undefined if the Http2Session is not yet connected to a socket, h2c if the Http2Session is not connected to a TLSSocket, or will return the value of the connected TLSSocket's own alpnProtocol property.