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* fix superfluous response call for WS request when there is a wrong configured proxy before Teleport it fails to return a proper error during WebSocket connect operation because of response.WriteHeader duplicate call first call is happened in the websocket.Upgrader's `returnError` function after WS headers mismatch and it only sets status to 400 Bad Request without any text https://github.com/gorilla/websocket/blob/v1.5.3/server.go#L77 Teleport tries to set the response status but fails to do that: http: superfluous response.WriteHeader call and the main reason of the error (missing WS headers) is lost * add explanation for disabling default WS error handler Co-authored-by: Tiago Silva <tfsantossilva93@gmail.com> Signed-off-by: Tiago Silva <tiago.silva@goteleport.com> * fix gci --------- Signed-off-by: Tiago Silva <tiago.silva@goteleport.com> Co-authored-by: Artem Nistratov <nistratov.artem@gmail.com>