string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BD%91%E7%BB%9C%E5%8F%97%E9%99%90%E6%98%AF%E5%9B%A0%E4%B8%BA%E4%BB%80%E4%B9%88%E5%8E%9F%E5%9B%A0%E5%91%A2 => Failed to connect to 14.18.117.71 port 38069: Connection refused"
网络受限是因为什么原因呢
