string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%B5%B5%E7%88%B1%E6%9E%97%E8%80%81%E5%B8%88%E7%9A%84%E5%AE%9E%E5%8A%A1%E6%A1%88%E4%BE%8B => Failed to connect to 14.18.117.71 port 38133: Connection refused"
赵爱林老师的实务案例
