CC wants to be able to analyze incoming data. This system analyses requests for taxis in different areas, discovers important patterns, and finds peak request times. The project manager assigned the team to build a system capable of running several versions of the same service in parallel, allowing the graceful evolution of the service during updates.

A member of the team stated that it is possible to use a topic exchange and structure the routing key as {service_name}{version}. Their idea works within the current system; however, RabbitMQ offers a more elegant solution to this problem through the headers exchange.

The headers exchange allows the routing of messages based on their headers, which are custom key-value pairs stored in the message properties. The custom key-value pairs guide messages to the correct queue or queues. With this approach, the message and its routing information are all self-contained, remain consistent, and are therefore easier...