string(267) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%B8%82%E5%9C%BA%E8%90%A5%E9%94%80%E6%A1%88%E4%BE%8B%E5%8F%8A%E5%85%B6%E5%88%86%E6%9E%90%E9%A2%98 => Failed to connect to 101.89.159.206 port 38087: Connection refused"
市场营销案例及其分析题
