string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%80%E9%80%A0%E6%A1%88%E4%BE%8B%E5%87%A0%E9%81%93%E5%A4%A7%E9%A2%98 => Failed to connect to 14.18.117.71 port 38093: Connection refused"
一造案例几道大题
