string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%AD%A6%E7%94%B5%E8%84%91%E6%9C%80%E5%9F%BA%E7%A1%80%E7%9F%A5%E8%AF%86 => Failed to connect to 101.89.159.206 port 38187: Connection refused"
学电脑最基础知识
