string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%AE%80%E5%8D%95%E6%89%93%E9%A2%86%E5%B8%A6%E7%9A%84%E6%96%B9%E6%B3%95 => Failed to connect to 101.89.143.195 port 38175: Connection refused"
简单打领带的方法
