string(265) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%8D%81%E4%BA%8C%E5%8F%B7%E5%9B%BD%E6%A0%87%E6%A7%BD%E9%92%A2%E4%B8%80%E7%B1%B3%E5%A4%9A%E9%87%8D => Failed to connect to 14.18.117.71 port 38164: Connection refused"
十二号国标槽钢一米多重
