--set github proxy
git config --global http.proxy http://user_name:user_pwd@user_ip:port
git config --system http.sslcainfo /bin/curl-ca-bundle.crt
--cancel proxy
git config --global (or --system or --local) --unset http.proxy
--set github proxy
git config --global http.proxy http://user_name:user_pwd@user_ip:port
git config --system http.sslcainfo /bin/curl-ca-bundle.crt
--cancel proxy
git config --global (or --system or --local) --unset http.proxy