string(265) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%B7%A5%E4%BD%9C%E6%96%B9%E9%9D%A2%E5%AD%98%E5%9C%A8%E7%9A%84%E4%B8%8D%E8%B6%B3%E4%B9%8B%E5%A4%84 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
工作方面存在的不足之处
