string(285) "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%E6%A0%B7%E5%BC%95%E7%94%A8%E6%A0%BC%E5%BC%8F%E6%89%8D%E6%AD%A3%E7%A1%AE => Failed to connect to 101.89.117.144 port 38017: Connection refused"
参考文献怎样引用格式才正确
