设置http/https代理：
export https_proxy="127.0.0.1:12333"
export http_proxy="127.0.0.1:12333"
如果有密码：
export http_proxy_user=test
export http_proxy_pass=test
测试代理http/https：
curl http://www.google.com
curl https://www.google.com
取消http/https代理设置：
unset http_proxy
unset https_proxy