string(265) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%80%8E%E4%B9%88%E6%8F%90%E9%AB%98%E6%90%9C%E7%B4%A2%E6%95%88%E7%8E%87%E7%9A%84%E6%96%B9%E6%B3%95 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
怎么提高搜索效率的方法
