string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%93%AA%E4%B8%AA%E5%85%85%E7%94%B5%E5%8D%8F%E8%AE%AE%E6%9C%80%E5%A5%BD => Failed to connect to 14.18.117.71 port 38069: Connection refused"
哪个充电协议最好
