string(240) "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%E9%85%8D%E9%80%81%E6%A8%A1%E5%BC%8F%E7%A0%94%E7%A9%B6 => Failed to connect to 101.89.159.206 port 38100: Connection refused"
外卖配送模式研究
