$ rosrun basics fancy_action_server.py
[WARN] [1572677557.904384]: Inbound TCP/IP connection failed: connection from sender terminated before handshake header received. 0 bytes were received. Please check sender for additional details.
出现该警告的原因： 1.使用中断导致一部分应该执行的流程没有成功执行[PREEMPTED] 2.程序流产，暂停了程序执行[ABORTED]
