string(261) "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%8F%8A%E5%85%B6%E5%BA%94%E7%94%A803142%E7%9F%A5%E8%AF%86%E7%82%B9 => Failed to connect to 14.18.117.71 port 38093: Connection refused"
互联网及其应用03142知识点
