string(294) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E9%9D%A2%E8%AF%95%E6%97%B6%E6%9C%80%E5%AE%B9%E6%98%93%E8%A2%AB%E9%97%AE%E5%88%B0%E7%9A%84%E5%85%AB%E4%B8%AA%E9%97%AE%E9%A2%98 => Failed to connect to 101.89.159.206 port 38187: Connection refused"
面试时最容易被问到的八个问题
