其中之一就是超文本传输协议，即HTTP，为文件连接确定了标准。

One is hypertext transfer protocol, or HTTP, which establishes specifications for linking documents.

youdao

只有版本 4 可以使用有状态的连接，且只有版本 4 将 TCP 用作其传输协议。

Only Version 4 can use stateful connections, and only Version 4 uses TCP as its transport protocol.

youdao

连接协议：该协议多路传输加密隧道到多个逻辑通道，通过用户认证协议运行。

Connection protocol: This protocol multiplexes the encrypted tunnel to numerous logical channels, running over the User Authentication protocol.

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