会话恢复

【Session resumption】

建立 TLS 会话可能相对较慢。通过保存并稍后重用会话状态，可以加快该过程。有几种机制可以实现这一点，这里按照从最旧到最新（也是首选）的顺序进行讨论。

【Establishing a TLS session can be relatively slow. The process can be sped up by saving and later reusing the session state. There are several mechanisms to do so, discussed here from oldest to newest (and preferred).】