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Protocols: AMQP, MQTT, HTTP APIs

AMQP (Advanced Message Queuing Protocol) defines entities like exchanges, queues, and bindings—RabbitMQ’s classic mode uses AMQP 0-9-1. MQTT focuses on lightweight pub/sub for IoT. Many cloud queues expose simple HTTP APIs instead.

Why care? Protocols define routing semantics (fanout, topic, direct), QoS levels, and interoperability across languages.

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