1. Two modes of Internet software
1.1 client/Server(C/S)
Client/server model
- Need to download and install the client
- The software consists of two parts: client and server
- Software update is troublesome, all clients need to be updated
- The computing pressure can be distributed to each terminal, and the computing pressure on the server can be greatly reduced
- Such as website glory, mobile QQ, mobile WeChat, Need for Speed, etc.
1.2 Browser/Server（B/S）
- No need to download and install the client, just a browser
- All software is deployed on the server side
- Software update is relatively simple, only need to update the server side.
- The computing pressure is basically on the server side, and it is generally not used for large-scale games
- For example: various websites, B station, Jingdong, Taobao
2. The three cornerstones of the Internet
2.1 url (Uniform Resource Locator)
On www, each information resource has a unified and unique address on the Internet, and the address is called URL (Uniform Resource Locator), which is www. Uniform Resource Locator, refers to the URL
2.2 http protocol (data analysis specification)
http is a simple request-response protocol. It usually runs on TCP. It specifies what kind of message the client may send to the server and what kind of response it gets. The request and response messages are given in the form of ASCII code; the content of the second message has a format similar to MIME. This simple model has contributed to the early success of the web because it enabled the development of