集群限流服务端返回too many request时为什么回退到本地限流模式

private static boolean applyTokenResult(/*@NonNull*/ TokenResult result, FlowRule rule, Context context,
                                                         DefaultNode node,
                                                         int acquireCount, boolean prioritized) {
        switch (result.getStatus()) {
            case TokenResultStatus.OK:
                return true;
            case TokenResultStatus.SHOULD_WAIT:
                // Wait for next tick.
                try {
                    Thread.sleep(result.getWaitInMs());
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                return true;
            case TokenResultStatus.NO_RULE_EXISTS:
            case TokenResultStatus.BAD_REQUEST:
            case TokenResultStatus.FAIL:
            case TokenResultStatus.TOO_MANY_REQUEST:
                return fallbackToLocalOrPass(rule, context, node, acquireCount, prioritized);
            case TokenResultStatus.BLOCKED:
            default:
                return false;
        }
    }