string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%A6%82%E4%BD%95%E6%8F%90%E9%AB%98%E6%90%9C%E7%B4%A2%E6%95%88%E7%8E%87 => Failed to connect to 101.89.159.206 port 38100: Connection refused"
如何提高搜索效率
