string(240) "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%E4%B8%BB%E8%A6%81%E6%96%B9%E6%B3%95 => Failed to connect to 101.89.159.206 port 38187: Connection refused"
网络推广主要方法
