红帽全球峰会8.4. 确认收到的消息
Delivery 对象可用于接受，拒绝发送。
示例：确认收到的信息
----
delivery.accept()
----示例：拒绝收到的消息
----
delivery.reject()
----示例：删除收到的消息
----
delivery.Release()
----
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