sephiroth-j edited a comment on pull request #311:

   I observed the exception in a project with Spring Boot 2.3 and Vaadin 14.2 
with an enabled 
 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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