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Does RabbitMQ actually have my message, or did my backend just lie to the customer?
What you'll have at the end
A publish call that waits for the broker's own confirm before your app tells the customer anything succeeded
You need
A backend endpoint that already publishes one event onto a durable queue whenever something in the business happens, using a client library that can turn synchronous publisher confirms on for a channel.
Not covered
Choosing a batched or asynchronous confirm strategy to avoid the throughput cost of waiting on every single publish is a separate call, made once proving one message's delivery is already solid.
Leans on
Make your queue consumer idempotent
covers the receiving side of the same worry: once a message is confirmed as delivered, a consumer that isn't safe against a redelivery can still double-process an event this recipe only proved reached a real queue.
Stop a crash from losing a job nobody acknowledged
covers the matching loss on the consumer side, a worker dying before it acknowledges a delivery it already has, a different point in the pipeline than a publish that never lands at all.
Checked 19 Aug 2026
Part of the Message Queues cookbook