红帽全球峰会42.6. 消息标头
Google Pubsub 组件支持 5 个消息标头，如下所列：
| Name | 描述 | 默认值 | 类型 |
|---|---|---|---|
| CamelGooglePubsubMessageId (common) constant: MESSAGE_ID | 在发布消息时服务器分配的消息的 ID。 | 字符串 | |
| CamelGooglePubsubMsgAckId (consumer) 常数： ACK_ID | 用于确认收到的消息的 ID。 | 字符串 | |
| CamelGooglePubsubPublishTime (consumer) 常量： PUBLISH_TIME | 发布消息的时间。 | Timestamp | |
| CamelGooglePubsubAttributes (common) 常数： ATTRIBUTES | 消息的属性。 | Map | |
| CamelGooglePubsubOrderingKey (producer) 常数： ORDERING_KEY | 如果非空，标识应遵守发布顺序的相关消息。 | 字符串 |
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