package demo; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RestController; @SpringBootApplication @RestController public class SampleApplication { public static void main(String[] args) { SpringApplication.run(SampleApplication.class, args); } @GetMapping("/test") public String io() throws InterruptedException { long sleepDuration = 200L + (long) (500L * Math.random()); Thread.sleep(sleepDuration); return "done after " + sleepDuration + "ms"; } }