string(235) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=wifi6%E6%8C%87%E7%9A%84%E6%98%AF%E5%93%AA%E7%A7%8D%E5%8D%8F%E8%AE%AE => Failed to connect to 101.91.112.32 port 38221: Connection refused"
wifi6指的是哪种协议
