string(264) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%8E%A8%E5%B9%BF%E6%96%B9%E6%B3%95%E7%AD%96%E7%95%A5%E4%B8%8E%E7%BB%8F%E9%AA%8C%E6%80%BB%E7%BB%93 => Failed to connect to 14.18.46.51 port 38044: Connection refused"
推广方法策略与经验总结
