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http和URL的基本常识
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http与URL的基本常识

http:基于请求与响应机制,客户端与服务器之间数据交换的协议
URL:请求的路由地址

1.http

  1. 客户端<=>服务器
  2. 请求 <=> 响应
  3. 连接:三次握手,确保双方收发正常
  4. 断开:四次挥手,确保双方完全断开

2.URL

(1) 静态URL
https://www.php.cn/course/1459.html

(2) 动态URL
http://site.cn:80/index.php/user/add?p=3&key=admin#link

index.php 应该由服务器路由到一个API(函数)去处理

1.htpps::协议
2.site.cn:域名
3.:80:端口
4./index.php:入口文件/应用程序/用一个函数来处理
5.user/add:PATH_INFO(可选的),用来做路由
6.?p=3&key=admin:查询参数/查询字符串/GET请求
7.#link:锚点/hash参数

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