RFC EditorRFC 5246: The Transport Layer Security (TLS) Protocol Version 1.2 · The TLS protocol provides a built-in mechanism for version negotiation so as not to bother other protocol components with the complexities of version selection. TLS 作者: Eric RescorlaPublish Year: 2008更多内容请查看https://www.rfc-editor.org/rfc/rfc5246