string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%88%97%E5%AD%90%E4%B8%80%E4%B9%A6%E5%8F%88%E5%90%8D%E4%BB%80%E4%B9%88 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
列子一书又名什么
