不知道因为什么，有时候git clone 会报错：
fatal: unable to access 'https://github.com/ros/robot_state_publisher.git/': gnutls_handshake() failed: The TLS connection was non-properly terminated.
第一种
git clone https://github.com/ros/robot_state_publisher.git/
因为权限不够,比如换成
sudo git clone https://github.com/ros/robot_state_publisher.git/
第二种
git clone https://github.com/ros/robot_state_publisher.git
是把https换成git换成
git clone git://github.com/ros/robot_state_publisher.git
第三种
//取消http代理
git config --global --unset http.proxy
//取消https代理
git config --global --unset https.proxy第四种
https://blog.csdn.net/RedKeyer/article/details/96119320
