string(284) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BA%AC%E4%B8%9C%E7%9A%84%E5%B8%82%E5%9C%BA%E8%90%A5%E9%94%80%E7%8E%AF%E5%A2%83%E8%BF%9B%E8%A1%8C%E5%88%86%E6%9E%90 => Failed to connect to 101.91.112.32 port 38195: Connection refused"
京东的市场营销环境进行分析
