string(303) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%AE%BA%E6%96%87%E4%B8%AD%E6%80%8E%E4%B9%88%E6%A0%87%E5%BC%95%E7%94%A8%E6%89%8D%E5%8F%AF%E4%BB%A5%E6%A3%80%E6%B5%8B%E5%87%BA%E6%9D%A5 => Failed to connect to 101.89.117.144 port 38017: Connection refused"
论文中怎么标引用才可以检测出来
