string(326) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%9B%A2%E8%B4%AD%E7%BD%91%E7%AB%99Groupon%E6%9C%80%E5%88%9D%E6%98%AF%E9%87%87%E7%94%A8%E5%90%91%E5%AE%A2%E6%88%B7%E6%8F%90%E4%BE%9B%E4%BC%98%E6%83%A0%E5%88%B8 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
团购网站Groupon最初是采用向客户提供优惠券
