string(351) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BB%8E%E5%88%9B%E4%B8%9A%E5%A4%B1%E8%B4%A5%E7%9A%84%E6%A1%88%E4%BE%8B%E4%B8%AD%2C%E4%BD%A0%E8%83%BD%E6%A6%82%E6%8B%AC%E5%87%BA%E9%82%A3%E4%BA%9B%E7%BB%8F%E9%AA%8C%E6%95%99%E8%AE%AD => Failed to connect to 101.89.117.144 port 38017: Connection refused"
从创业失败的案例中,你能概括出那些经验教训
