using System; using System.Collections.Generic; using System.Text; using System.Data; using System.IO; using System.Net; using System.Net.Security; using System.Security.Cryptography.X509Certificates; using System.IO.Compression; using System.Net.Cac
You enter a URL into the browser输入一个url地址 The browser looks up the IP address for the domain name浏览器查找域名的ip地址(浏览器缓存→系统缓存→路由器缓存→ISP DNS缓存→从根域名服务器递归搜索) The browser sends a HTTP request to the web server浏览器给web服务器发送一个HTTP请求 The facebook server responds