string(249) "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%E6%98%AF%E5%95%A5%E6%83%85%E5%86%B5 => Failed to connect to 101.89.159.206 port 38100: Connection refused"
打印机脱机是啥情况
