string(274) "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%E5%8F%91%E5%B1%95%E5%8E%86%E7%A8%8B%E5%8F%8A%E7%8E%B0%E7%8A%B6 => Failed to connect to 14.18.117.71 port 38133: Connection refused"
中国互联网发展历程及现状
