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%E6%8A%80%E6%9C%AF%E6%97%A5%E7%9B%8A%E5%B9%BF%E6%B3%9B%E7%9A%84%E5%BA%94%E7%94%A8 => Failed to connect to 14.18.117.71 port 38133: Connection refused"
互联网技术日益广泛的应用
