string(267) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%8A%98%E4%BB%B7%E7%8E%87%E5%A4%A7%E4%BA%8E0%E5%A5%BD%E8%BF%98%E6%98%AF%E5%B0%8F%E4%BA%8E0%E5%A5%BD => Failed to connect to 61.171.74.35 port 38041: Connection refused"
折价率大于0好还是小于0好
