string(258) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B5%81%E9%87%8F%E8%AE%A1%E4%BC%A0%E6%84%9F%E5%99%A8%E5%AE%89%E8%A3%85%E6%96%B9%E6%B3%95 => Failed to connect to 101.89.143.195 port 38205: Connection refused"
流量计传感器安装方法
