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悖论
当你进入https://featurehouse.github.io/404.html，请你思考一个问题：是你的浏览器真的在访问404页面，还是因为它找不到404.html才给你显示404页面呢？
回到主页Paradox
When you enter https://featurehouse.github.io/404.html, please think: Is your browser really connecting to a 404 page, or is your browser cannot find 404.html thus showing you this 404 page?
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