eventReactive with async event:

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Choose each of the choices above, and verify that the two outputs below always look identical.

observeEvent with async event:

Try all of these buttons, and confirm that they exhibit the expected behavior.

Success After a one second delay, you should see a success message printed at the R console

Silent error (i.e. req(FALSE)) Should have no effect

Validation error Should have no effect

Error The session should be disconnected and an error printed at the console