string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%B7%A5%E4%BD%9C%E4%B8%AD%E7%9A%84%E4%B8%8D%E8%B6%B3%E5%92%8C%E6%94%B9%E8%BF%9B%E6%80%8E%E4%B9%88%E5%86%99 => Failed to connect to 14.116.215.7 port 38225: Connection refused"
工作中的不足和改进怎么写
