string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%BF%83%E7%8E%87%E9%87%87%E9%9B%86%E5%8E%9F%E7%90%86%E5%9B%BE%E8%A7%A3 => Failed to connect to 101.89.166.210 port 38089: Connection refused"
心率采集原理图解
