string(232) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%94%B5%E4%BF%A1dns%E5%9C%B0%E5%9D%80%E6%98%AF%E4%BB%80%E4%B9%88 => Failed to connect to 14.116.215.7 port 38225: Connection refused"
电信dns地址是什么
