string(258) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%8E%A8%E5%B9%BF%E6%96%B9%E5%BC%8F%E5%88%86%E6%9E%90%E7%9A%84%E4%BC%98%E7%BC%BA%E7%82%B9 => Failed to connect to 101.89.117.144 port 38022: Connection refused"
推广方式分析的优缺点
