string(252) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=o2o%E5%A4%96%E5%8D%96%E9%85%8D%E9%80%81%E6%A8%A1%E5%BC%8F%E6%9C%89%E5%87%A0%E7%A7%8D => Failed to connect to 101.89.166.210 port 38089: Connection refused"
o2o外卖配送模式有几种
