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从输入域名到最后呈现经历的过程
source link: https://juejin.im/post/5abdc4a86fb9a028bf056b5d
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具体步骤 1.浏览器的地址栏输入URL并按下回车。 2.浏览器查找当前URL是否存在缓存，并比较缓存是否过期。 3.DNS解析URL对应的IP。 4.根据IP建立TCP连接（三次握手）。 5.HTTP发起请求。 6.服务器处理请求，浏览器接收HTTP响应。 7
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