string(234) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%9B%BD%E5%86%85%E6%9C%80%E5%BF%AB%E7%9A%84dns%E6%B5%8B%E8%AF%95 => Failed to connect to 101.89.117.144 port 38022: Connection refused"
国内最快的dns测试
