string(328) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BB%93%E5%90%88%E6%A1%88%E4%BE%8B%E5%88%86%E6%9E%90%E5%88%9B%E4%B8%9A%E5%A4%B1%E8%B4%A5%E7%9A%84%E5%85%B3%E9%94%AE%E6%98%AF%E4%BB%80%E4%B9%88%E9%97%AE%E9%A2%98 => Failed to connect to 14.18.117.71 port 38069: Connection refused"
结合案例分析创业失败的关键是什么问题
