tlsSocket.alpnProtocol

• 类型：<string> | <boolean> | <null>

协商的 ALPN 协议。在握手完成之前，这是 null。握手完成后，它会确定为协商的协议名称，或者如果对端没有协商 ALPN 协议，则为 false。

🌐 The negotiated ALPN protocol. This is null before the handshake completes. Once the handshake completes, it settles as either the negotiated protocol name, or false if the peers did not negotiate an ALPN protocol.