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#服务器 启动了服务的机器 有一个地址,让别人能找到你 每台联网的计算机需要IP地址 端口号 http 80 ftp 21 1.1.1.1:21 国风美唐4号楼:408 能够根据客人的要求提供服务

#客户端 能够发起请求的都是客户端 qq 微信 浏览器

#http协议

##url url

##请求 请求响应 ##响应

#网站的访问流程

  1. 在浏览器中输入URL地址。
  2. 把域名转成IP地址。
  3. 客户端与服务器建立连接。
  4. 客户端把请求发给服务器。
  5. 服务器接收到请求把响应发给客户端。
  6. 客户端接收响应,进行显示。

#头部 header 首部

  • 通用头
  • 请求头
  • 响应头
  • 实体头
  • 自定义头

#状态码

  • 1xx 请求处理中
  • 2xx 成功响应
  • 3xx 重定向 302 location
  • 4xx 客户端错误 404
  • 5xx 服务器端错误

#ajax

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