string(266) "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%E6%80%8E%E4%B9%88%E5%BC%95%E7%94%A8%E5%88%B0%E6%AD%A3%E6%96%87 => Failed to connect to 101.91.112.32 port 38195: Connection refused"
参考文献怎么引用到正文
