@GetMapping
    @HystrixCommand(commandProperties = {
            @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "50")
    }, fallbackMethod = "fallbackMethod")
    public String say(@RequestParam(required = false, defaultValue = "10") long time) throws InterruptedException {
        TimeUnit.MILLISECONDS.sleep(time);
        log.info("{} sleep time {}毫秒", Thread.currentThread().getName(), time);
        return "hello hystrix";
    }
    // 参数列表必须跟say方法一致
    public String fallbackMethod(long time) {
        log.info("{} fallback ,sleep time {}毫秒", Thread.currentThread().getName(), time);
        return "fallback, hystrix intervention";
    }