string(284) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%BA%E4%BB%80%E4%B9%88%E6%98%BE%E7%A4%BA%E7%BD%91%E7%BB%9C%E5%8F%97%E9%99%90%E8%BF%9E%E6%8E%A5%E5%A4%B1%E8%B4%A5 => Failed to connect to 101.91.112.32 port 38195: Connection refused"
为什么显示网络受限连接失败
