string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%B8%82%E5%9C%BA%E8%90%A5%E9%94%80%E7%9A%84%E5%B0%8F%E6%A1%88%E4%BE%8B => Failed to connect to 14.18.117.71 port 38093: Connection refused"
市场营销的小案例
