原因：由于某些你懂的因素，导致GitHub的raw.githubusercontent.com域名解析被污染了。
解决办法：通过修改hosts解决此问题。
查询真实IP
在https://www.ipaddress.com/查询raw.githubusercontent.com的真实IP。
修改hosts
sudo vim /etc/hosts
添加如下内容：
199.232.28.133 raw.githubusercontent.com
Failed to connect to raw.githubusercontent.com port 443: Connection refused
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