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AMQP/Rabbit can use TLS (even if not leveraged in this project, something not possible for ZeroMQ IIRC). Also, define "centralized". An intelligent AMQP client properly falls over to another node in a cluster, and Rabbit offers good durability guarantees while still allowing quorum and tolerating node failure.

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But we're talking about HTTP requests here. The RabbitMQ durability is useless for this use case. Suppose the RabbitMQ node fails, and the admin notices after 2 minutes and solves the problem after 2 more minutes. The user who initiated the HTTP request has long pressed Stop in his browser.

True, durability wouldn't help here, however, individual Rabbit queues can fail over to alternate nodes if the master node for that queue stops responding.

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