string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%90%A5%E9%94%80%E7%AD%96%E7%95%A5%E6%A1%88%E4%BE%8B%E5%88%86%E6%9E%90%E9%A2%98 => Failed to connect to 14.18.117.71 port 38220: Connection refused"
营销策略案例分析题
