string(267) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%80%8E%E6%A0%B7%E6%8F%90%E9%AB%98%E8%BD%AC%E5%8C%96%E7%8E%87%E4%BD%8E%E7%9A%84%E9%97%AE%E9%A2%98 => Failed to connect to 125.88.227.171 port 38062: Connection refused"
怎样提高转化率低的问题
