string(231) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%BC%80%E5%8F%91app%E7%9A%84%E5%85%B7%E4%BD%93%E8%BF%87%E7%A8%8B => Failed to connect to 14.18.46.51 port 38206: Connection refused"
开发app的具体过程
