Header name incorrect case

We are using Traefik v2 as a reverse-proxy for IIS. We are using a field called AuthMode. When it goes through Traefik as a request it is being converted to lower case Authmode. Note the m. Is there an option to preserve case? If not, is there a way through middlewares to remove this bad version and insert the correct case?

http/1.1 headers are case insensitive, the endpoint should consider the case in any mix valid.

http/2 all headers are lowercase.

Don't think so.