string(276) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BB%A5%E4%B8%8B%E8%BF%99%E4%BA%9B%E6%8E%A8%E5%B9%BF%E6%96%B9%E5%BC%8F%E5%B1%9E%E4%BA%8E%E4%BB%80%E4%B9%88 => Failed to connect to 101.89.143.195 port 38109: Connection refused"
以下这些推广方式属于什么
