string(285) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BA%92%E8%81%94%E7%BD%91%E6%8A%80%E6%9C%AF%E7%9A%84%E5%8F%91%E5%B1%95%E5%8E%86%E5%8F%B2%E5%92%8C%E7%8E%B0%E7%8A%B6 => Failed to connect to 101.89.159.206 port 38087: Connection refused"
互联网技术的发展历史和现状
