string(231) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BE%8E%E7%89%88%E6%9C%89%E9%94%81%E7%9A%84%E7%BC%BA%E7%82%B9 => Failed to connect to 101.89.143.195 port 38175: Connection refused"
美版有锁的缺点
