string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%9F%AD%E8%B7%AF%E5%92%8C%E6%96%AD%E8%B7%AF%E5%95%A5%E6%84%8F%E6%80%9D => Failed to connect to 14.18.117.71 port 38133: Connection refused"
短路和断路啥意思
