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https://blog.toright.com/posts/4303/nginx-%e5%88%a4%e6%96%b7%e8%a3%9d%e7%bd%ae%e9%a1%af%e7%a4%ba%e4%b8%8d%e5%90%8c%e7%b6%b2%e9%a0%81%e7%9a%84%e6%96%b9%e6%b3%95.html
Nginx 判斷裝置 (User-Agent) 顯示不同網頁的方法