string(270) "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%E5%B8%82%E5%9C%BA%E9%85%8D%E9%80%81%E6%A8%A1%E5%BC%8F%E6%98%AF%E4%BB%80%E4%B9%88 => Failed to connect to 101.89.117.144 port 38022: Connection refused"
o2o外卖市场配送模式是什么
