string(240) "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%E7%9A%84%E5%B8%B8%E9%97%AE%E7%9A%84%E9%97%AE%E9%A2%98 => Failed to connect to 101.89.117.144 port 38208: Connection refused"
面试的常问的问题
