Is your feature request related to a problem? Please describe.

I am currently reading the source code of a2a client and noticed that the callback method provided in the onError method of SSEEventListener is failureHandler.run(); This causes the throwable to be unable to be caught through the callback method.Unfavorable for abnormal printing and processing

Describe the solution you'd like

public void onError(Throwable throwable, Future<Void> future) { failureHandler.run(); future.cancel(true); // close SSE channel }
suggest:
In the source code, "failureHandler" is changed to "Consumer<?" super Throwable> errorConsumer

Describe alternatives you've considered

No response

Additional context

No response

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