string(231) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%8A%A0%E5%BC%BA%E9%94%BB%E7%82%BC%E7%9A%84%E6%84%8F%E6%80%9D => Failed to connect to 101.89.117.144 port 38017: Connection refused"
加强锻炼的意思
