[GitHub] [tomcat] sephiroth-j edited a comment on pull request #311: support schemes "wss" and "ws" in WsHandshakeRequest.buildRequestUri()

[GitBox <gi...@apache.org>]

sephiroth-j edited a comment on pull request #311:
URL: https://github.com/apache/tomcat/pull/311#issuecomment-653173711


   I observed the exception in a project with Spring Boot 2.3 and Vaadin 14.2 with an enabled [`ForwardedHeaderFilter`](https://github.com/spring-projects/spring-framework/blob/master/spring-web/src/main/java/org/springframework/web/filter/ForwardedHeaderFilter.java). 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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