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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