开始

浏览器

服务器(apache,nginx,node)

GET /index.html HTTP/1.1
Host: www.atguigu.com
User-agent: chrome 
refer: www.atguigu.com

GET /css/index.css HTTP/1.1
Host: www.atguigu.com
User-agent: chrome
refer: www.atguigu.com

GET /images/h5.png HTTP/1.1
Host: www.atguigu.com
User-agent: chrome
refer: www.atguigu.com

GET /js/index.js HTTP/1.1
Host: www.atguigu.com
User-agent: chrome
refer: www.atguigu.com