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输入网址到浏览器页面呈现过程 #15

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hezizi opened this issue Sep 16, 2018 · 0 comments

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hezizi commented Sep 16, 2018

面试中经常会问的一个问题，先简述，后面会仔细描述每一步骤

输入网址，敲回车
浏览器通过输入的URL，构建HTTP请求报文
浏览器发起DNS解析，将域名转换为IP地址
浏览器将请求报文发送给服务器
服务器接收到请求报文并进行解析
服务器处理用户请求，将处理结果封装成HTTP响应报文
服务器将响应报文发送给浏览器
浏览器接受服务器发送的HTTP响应报文，并解析
浏览器渲染引擎解析HTML生成DOM树，CSS规则树，生成渲染树，进行layout，最后绘制
解析HTML时遇到新的资源需要再次发起请求
最终浏览器呈现页面

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