string(265) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%88%9B%E4%B8%9A%E4%B9%8B%E6%98%9F%E8%BD%AF%E4%BB%B6%E7%9A%84%E5%AE%9E%E9%AA%8C%E5%8E%9F%E7%90%86 => Failed to connect to 14.18.117.71 port 38220: Connection refused"
创业之星软件的实验原理
