string(301) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BD%91%E7%BB%9C%E6%8E%A8%E5%B9%BF%E7%9A%84%E5%B9%B3%E5%8F%B0%E6%B8%A0%E9%81%93%E6%9C%89%E5%93%AA%E4%BA%9B%E7%B1%BB%E5%9E%8B%E5%91%A2 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
网络推广的平台渠道有哪些类型呢
