原因：由於某些你懂的因素，導致GitHub的raw.githubusercontent.com域名解析被污染了。
解決辦法：通過修改hosts解決此問題。
查詢真實IP
在https://www.ipaddress.com/查詢raw.githubusercontent.com的真實IP。
修改hosts
sudo vim /etc/hosts
添加如下內容：
199.232.28.133 raw.githubusercontent.com
Failed to connect to raw.githubusercontent.com port 443: Connection refused
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