string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%9C%89%E5%93%AA%E4%BA%9B%E6%8E%A8%E5%B9%BF%E6%96%B9%E6%B3%95%E5%A5%BD%E5%81%9A => Failed to connect to 14.116.215.7 port 38230: Connection refused"
有哪些推广方法好做
