Protocol Extensions
The RabbitMQ Server implements a number of extensions of the AMQP specification, which we document here.
Publishing
Consuming
- Consumer Cancellation Notifications let a consumer know if it has been cancelled by the server.
- basic.nack extends basic.reject to support rejecting multiple messages at once.
Message Routing
- Exchange to Exchange Bindings allow messages to pass through multiple exchanges for more flexible routing.
- Alternate Exchanges route messages that were otherwise unroutable.
- Sender-selected Distribution allows a publisher to decide where messages are routed directly.
Message Lifecycle
- Per-Queue Message TTL determines how long an unconsumed message can live in a queue before it is automatically deleted.
- Per-Message TTL determines the TTL on a per-message basis.
- Queue TTL determines how long an unused queue can live before it is automatically deleted.
- Dead Letter Exchanges ensure messages get re-routed when they are rejected or expire.
- Length Limit allows the maximum length of a queue to be set.
Undeprecated features
- Some features that were in AMQP 0-8 were deprecated in AMQP 0-9-1. We have undeprecated some of them.