1. curl使用http_proxy和https_proxy环境变量，所有使用curl进行网络访问的程序都可以通过修改这两个变量来走代理。
   假设酸酸乳代理端口为1080，则可以设置：

http_proxy = http://127.0.0.1:1080
https_proxy = http://127.0.0.1:1080

2. github usercontent 有时莫名无法访问，可以改Hosts文件：

GitHub Start

52.74.223.119 github.com
52.74.223.119 gist.github.com
54.169.195.247 api.github.com
185.199.111.153 assets-cdn.github.com
199.232.96.133 raw.githubusercontent.com
199.232.96.133 gist.githubusercontent.com
199.232.96.133 cloud.githubusercontent.com
199.232.96.133 camo.githubusercontent.com
199.232.96.133 avatars0.githubusercontent.com
199.232.96.133 avatars1.githubusercontent.com
199.232.96.133 avatars2.githubusercontent.com
199.232.96.133 avatars3.githubusercontent.com
199.232.96.133 avatars4.githubusercontent.com
199.232.96.133 avatars5.githubusercontent.com
199.232.96.133 avatars6.githubusercontent.com
199.232.96.133 avatars7.githubusercontent.com
199.232.96.133 avatars8.githubusercontent.com
199.232.96.133 user-images.githubusercontent.com
185.199.109.154 github.githubassets.com

GitHub End

问题记录：解决各种网络问题

原文：https://www.cnblogs.com/BinarySong/p/14762690.html