user-space protocol layer expanding mode 用户空间协议层扩展模式
User Authentication protocol: This protocol authenticates the client to the server and runs over the transport layer.
用户认证协议：该协议从服务器到客户端进行身份验证，且通过传输层运行。
This layer intercepts requests from the user and in the background, communicates with the server quietly and asynchronously to get the desired content of an HTTP protocol.
该层拦截来自用户的请求，然后在后台与服务器通信并异步获得所需的HTTP协议内容。
The two most popular transport layer protocols are the transmission control protocol (TCP) and the user datagram protocol (UDP)
两种最流行的传输层协议是传输控制协议（TCP）和用户数据报协议（UDP）
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