设置代理：

export http_proxy=http://127.0.0.1:7890;
export https_proxy=$http_proxy;
export all_proxy=$http_proxy;
// export https_proxy=http://127.0.0.1:7890;

取消代理：

unset export http_proxy;
unset export https_proxy;
unset export all_proxy;

Link:

• Mac终端代理设置
• Failed to connect to raw.githubusercontent.com:443