I'm trying to switch a proxy setup from nginx to traefik. We're having a weird issue with our custom Headers in our test environment in the new setup. One of these custom headers sometimes contains latin1 character. For some reason, traefik will change it's value to the undefined one in UTF8 (\ufffd). Has anyone ever experienced this issue ? Is there any way to make a header ignored by traefik so that it can remain latin1 encoded ?