錯誤信息：
Unable to infer base url.
This is common when using dynamic servlet registration or when the API is behind an API Gateway.
The base url is the root of where all the swagger resources are served. For e.g. if the api is available at http://example.org/api/v2/api-docs then the base url is http://example.org/api/.
Please enter the location manually:
出現這種錯誤的原因是啟動類沒有掃描到swagger配置類
解決辦法：
1、把swagger放到可以掃描到的包下
2、在啟動類添加@ComponentScan注解掃描swagger配置類