string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%A4%96%E5%8D%96%E5%B1%9E%E4%BA%8E%E4%BB%80%E4%B9%88%E8%90%A5%E9%94%80%E6%A8%A1%E5%BC%8F => Failed to connect to 61.171.74.35 port 38027: Connection refused"
外卖属于什么营销模式
