The Heartbeat Extension provides a new protocol for TLS/DTLS allowing the usage of keep-alive functionality without performing a renegotiation and a basis for path MTU (PMTU) discovery for DTLS.

TLS心跳扩展为TLS/DTLS提供了一种允许在不重新进行商议和发送路径MTU探索包（PMTU）的情况下而使用保持持续通信功能的新协议。

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