fatal: unable to access 'https://github.com/pirobot/rbx1/': Failed to connect to 127.0.0.1 port 3517
问题：
[email protected]:~/catkin_ws/src/rbx1-indigo-devel/rbx1$ git pull
fatal: unable to access ‘https://github.com/pirobot/rbx1/‘: Failed to connect to 127.0.0.1 port 35173: Connection refused
解决：https://stackoverflow.com/questions/30828237/git-refuses-to-connect-without-proxy
注意：
unset时是http_proxy
禁止使用时是 http.proxy