string(294) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%9C%80%E6%9C%89%E6%95%88%E7%9A%84%E6%8E%A8%E5%B9%BF%E6%96%B9%E5%BC%8F%E6%9C%89%E5%93%AA%E4%BA%9B%E7%B1%BB%E5%9E%8B%E5%91%A2 => Failed to connect to 101.89.117.144 port 38022: Connection refused"
最有效的推广方式有哪些类型呢
