string(293) "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%E5%A4%B1%E8%B4%A5%E7%9A%84%E4%B8%BB%E8%A6%81%E5%8E%9F%E5%9B%A0%E6%98%AFa%E9%80%89%E5%9D%80%E4%B8%8D%E5%BD%93 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
创业失败的主要原因是a选址不当
