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RabbitMQ is an open source message broker. Spacebar can be configured to use it for communication between the API server and Gateway server. RabbitMQ is required to be set up when you run the API and Gateway servers separately (outside of bundle). Without it, the Gateway server won't know when you send new events for things such as message creation. In the message create case, you will be able to send messages, but will have to reload the client to view new messages from others.

After you've downloaded and installed RabbitMQ, edit Spacebar's config, set rabbitmq_host to "amqp://guest:guest@host:5672"

The guest RabbitMQ account can only be accessed via localhost, by default. If you want to run Spacebar over multiple systems, you'll need to set up access control in RabbitMQ.