string(276) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%BA%94%E8%AF%A5%E5%A6%82%E4%BD%95%E9%80%89%E6%8B%A9%E6%A5%BC%E6%A2%AF%E7%9A%84%E5%BD%A2%E5%BC%8F%E5%91%A2 => Failed to connect to 101.89.117.144 port 38022: Connection refused"
应该如何选择楼梯的形式呢
