I am implementing JSON Web Token authentication in my Sparkle server using the JWT middleware and have a quick question. I can see that when the server sees an 'Authorization' header with a 'Bearer' value then the JWT middleware tries to verify the token. If the token fails verification, the server returns with 401 and with a response body of 'Invalid JWT'. This is OK, but I'd like to customise the response body if possible. I can see when it fails verification, the 'ProcessRequest' method doesn't even fire so I can't see where I would do this?
Thanks and Happy Christmas!