string(253) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2021%E5%92%A8%E8%AF%A2%E5%B7%A5%E7%A8%8B%E5%B8%88%E6%AD%A3%E7%A1%AE%E7%AD%94%E6%A1%88 => Failed to connect to 101.89.117.144 port 38208: Connection refused"
2021咨询工程师正确答案
