string(274) "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%E5%BA%94%E7%94%A8%E7%9A%84%E5%8F%91%E5%B1%95%E7%8E%B0%E7%8A%B6%E8%AE%BA%E6%96%87 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
互联网应用的发展现状论文
