[Interview Summary] Load webpage from URL

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这里写图片描述

 1. input URL 2. check local cache to ensure whether the we     bpage is updated or not.     (HTTP status==304?)3. DNS resolve to get IP address4. HTTP request package5. HTTP three-way-handshake6. send HTTP request package78. server handle request package910. send response package to the client11. four-hand shake disconnection12. check response status13. parse gzip14. render and show the webpage
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