string(276) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%AD%E5%9B%BD%E4%BA%92%E8%81%94%E7%BD%91%E7%9A%84%E5%8F%91%E5%B1%95%E5%8E%86%E5%8F%B2%E7%AE%80%E6%A6%82 => Failed to connect to 101.89.117.144 port 38022: Connection refused"
中国互联网的发展历史简概
