https://www.cnblogs.com/yangfengwu/p/11640870.html
First, build a root directory file
Second, use a browser to access
http://47.92.31.46:80/1.txt or http://47.92.31.46/1.txt
Third, the use of TCP clients to access file contents
3.1, connect to the server using TCP client, IP / domain name Port number: 80
3.2, send http protocol
GET + space + / file path + space + HTTP / 1.1
Host: + space + IP / Domain Name
Two wrap to here
GET /1.txt HTTP/1.1 Host: 47.92.31.46
After the above data transmission connection
Data return
12 is : . 17 : 21 is the transmission data: the GET / . 1 .txt the HTTP / 1.1 the Host: 47.92 . 31.46 [views. 1] 12 is : . 17 : 21 is the received data: the HTTP / 1.1 200 is the OK Server: openresty / 1.15 . 8.2 a Date: Wed, 09 On Oct 2019 04 : . 17 : 20 is GMT the Content -Type: text / Plain the Content -Length: 10 Last -Modified: Wed, 09 On Oct 2019 04:01:46 GMT Connection: keep-alive ETag: "5d9d5baa-a" Accept-Ranges: bytes 1234567890