Failed to connect to raw.githubusercontent.com 443 解决方案

wget 'https://raw.githubusercontent.com/CSSEGISandData/COVID-19/master/csse_covid_19_data/csse_covid_19_time_series/time_series_covid19_confirmed_US.csv'
--2020-12-11 15:11:28--  https://raw.githubusercontent.com/CSSEGISandData/COVID-19/master/csse_covid_19_data/csse_covid_19_time_series/time_series_covid19_confirmed_US.csv
Resolving raw.githubusercontent.com (raw.githubusercontent.com)... 151.101.108.133
Connecting to raw.githubusercontent.com (raw.githubusercontent.com)|151.101.108.133|:443... failed: Connection refused.

一般是DNS污染问题，修改hosts文件即可

1.访问 https://www.ipaddress.com/ ，查询 raw.githubusercontent.com 的IP

2.修改 /etc/hosts 文件，追加类似以下内容

199.232.28.133 raw.githubusercontent.com

3.保存退出即可