string(237) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2000%E7%9A%84%E4%B8%BB%E6%9D%BF%E5%92%8C4000%E7%9A%84%E5%8C%BA%E5%88%AB => Failed to connect to 14.18.117.71 port 38041: Connection refused"
2000的主板和4000的区别
