string(274) "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%96%B9%E9%9D%A2%E7%9A%84%E6%A1%88%E4%BE%8B%E5%8F%8A%E5%88%86%E6%9E%90 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
市场营销方面的案例及分析
