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Problem
ListenAndServe() method blocks the main goroutine, but when gracefulShutdown(server) is called in a separate goroutine, the Shutdown() function is triggered when an interrupt signal is received.
if the server.ListenAndServe() call does not return http.ErrServerClosed, it indicates that the server did not shut down properly, causing the main goroutine to keep running and preventing a clean exit
Checklist