string(294) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BB%80%E4%B9%88%E6%98%AF%E7%9F%AD%E8%B7%AF%E7%9F%AD%E8%B7%AF%E6%9C%89%E5%93%AA%E5%87%A0%E7%A7%8D%E7%B1%BB%E5%9E%8B%E5%91%A2 => Failed to connect to 101.89.159.206 port 38087: Connection refused"
什么是短路短路有哪几种类型呢
