Outbound Endpoints
以下输出端点有许多相似的配置选项。从 5.2 版开始，已添加 confirm-timeout。通常，当启用发布者确认时，代理将快速返回确认（或未确认），该确认将发送到相应的通道。如果在收到确认之前通道已关闭，Spring AMQP 框架将合成未确认。永远不应出现“缺少”确认的情况，但如果你设置此属性，端点将定期检查它们，如果在没有收到确认的情况下时间过长，将合成未确认。
The following outbound endpoints have many similar configuration options.
Starting with version 5.2, the confirm-timeout has been added.
Normally, when publisher confirms are enabled, the broker will quickly return an ack (or nack) which will be sent to the appropriate channel.
If a channel is closed before the confirm is received, the Spring AMQP framework will synthesize a nack.
"Missing" acks should never occur but, if you set this property, the endpoint will periodically check for them and synthesize a nack if the time elapses without a confirm being received.