string(283) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BD%91%E7%BB%9C%E6%8E%A8%E5%B9%BF%E4%B8%8E%E4%BC%A0%E7%BB%9F%E4%BF%83%E9%94%80%E6%9C%89%E4%BD%95%E5%BC%82%E5%90%8C => Failed to connect to 14.18.117.71 port 38220: Connection refused"
网络推广与传统促销有何异同
