string(249) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%AD%E6%B5%B7%E7%9F%B3%E6%B2%B9%E4%BB%8A%E6%97%A592%E5%8F%B7%E6%B2%B9%E4%BB%B7 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
中海石油今日92号油价
