sephiroth-j commented on pull request #311:

   i observed the exception in Spring Boot Project with Vaadin with an enabled 
`ForwardedHeaderFilter`. The setup was Traefik as reverse proxy with TLS 
termination forwarding the request from the client to the backend listening on 
plain HTTP. The client starts a websocket request using the URI scheme 
"wss://". Traefik adds the header "X-Forwared-Proto: wss" (_among others_). 
`ForwardedHeaderFilter` alters the scheme property of the `HttpServletRequest` 
to the value from the "X-Forwared-Proto" header. The result is an internal 
server error (500) caused by that `IllegalArgumentException`.

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