Why do websocket connections fail when I use http2, but succeed when http2 is disabled?

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Why do websocket connections fail when I use http2, but succeed when http2 is disabled?
javalin version：5.6.3
And there is a strange phenomenon when I use http2, when I use the edge browser will not connect at first, after a period of time suddenly connected, refresh the browser and not connected, but using http1.1 has always been able to connect!