参考：解决Github网页上图片显示失败的问题
https://blog.csdn.net/qq_38232598/article/details/91346392
现象：
我出现的错误 大部分为ERR_CONNECTION_REFUSED 和上面参考中的错误不一样，但解决方法一致 ，他娘的dns污染！！
摘录本机的host文件设置如下20201228：
# GitHub Start
140.82.113.3 github.com
140.82.114.20 gist.github.com
151.101.184.133 assets-cdn.github.com
151.101.184.133 raw.githubusercontent.com
151.101.184.133 gist.githubusercontent.com
151.101.184.133 cloud.githubusercontent.com
151.101.184.133 camo.githubusercontent.com
151.101.184.133 avatars0.githubusercontent.com
199.232.68.133 avatars0.githubusercontent.com
199.232.28.133 avatars1.githubusercontent.com
151.101.184.133 avatars1.githubusercontent.com
151.101.184.133 avatars2.githubusercontent.com
199.232.28.133 avatars2.githubusercontent.com
151.101.184.133 avatars3.githubusercontent.com
199.232.68.133 avatars3.githubusercontent.com
151.101.184.133 avatars4.githubusercontent.com
199.232.68.133 avatars4.githubusercontent.com
151.101.184.133 avatars5.githubusercontent.com
199.232.68.133 avatars5.githubusercontent.com
151.101.184.133 avatars6.githubusercontent.com
199.232.68.133 avatars6.githubusercontent.com
151.101.184.133 avatars7.githubusercontent.com
199.232.68.133 avatars7.githubusercontent.com
151.101.184.133 avatars8.githubusercontent.com
199.232.68.133 avatars8.githubusercontent.com
199.232.96.133 user-images.githubusercontent.com
# GitHub End