string(267) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%8F%82%E8%80%83%E6%96%87%E7%8C%AE%E5%BA%94%E8%AF%A5%E6%80%8E%E4%B9%88%E5%BC%95%E7%94%A8%E5%91%A2 => Failed to connect to 101.89.159.206 port 38087: Connection refused"
参考文献应该怎么引用呢
