Headers

Message headers are used in a variety of JetStream contexts, such de-duplication, auto-purging of messages, metadata from republished messages, and more.

Publish

Headers that can be set by a client when a message being published.

RePublish

Headers set messages that are republished.

Sources

Headers that are implicitly added to messages sourced from other streams.

Headers-only

Headers added to messages when the consumer is configured to be "headers only" omitting the body.

Mirror

Headers used for internal flow-control messages for a mirror.

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