string(265) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%89%93%E5%8D%B0%E6%9C%BA%E8%84%B1%E6%9C%BA%E7%8A%B6%E6%80%81%E5%A6%82%E4%BD%95%E6%81%A2%E5%A4%8D => Failed to connect to 14.18.117.71 port 38220: Connection refused"
打印机脱机状态如何恢复
