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I'm just wondering why WEBSOCKET_XHR isn't the default with the @Push annotation ? If I understood correctly then if the setting is the default of WEBSOCKET then there's will be no ServletRequest. I can't really comprehend the implication of that but it sounds severe to me.
I'm doing container-based authentication so I believe I would need transport=WEBSOCKET_XHR and then I came to think why you wouldn't want transport=WEBSOCKET_XHR rather than transport=WEBSOCKET in almost all cases ?