如何在令牌过期（而不是无效）时让OAuthAuthorizationServerProvider返回特定的错误代码或响应？

I've got a regular OWIN OAuth setup for my MVC WebAPI project - one of the requests from the frontend developers was to be able to determine whether a token is rejected because it's expired, or when it's just an invalid token. I've got a regular OWIN OAuth setup for my MVC