12.1. Gateway Architecture
The gateway monitors and detects any changes in the ZooKeeper registry for all Web applications, Web services, servlets and message brokers. For all of the registered services, the gateway applies mapping rules to figure out how to expose those services through TCP or HTTP.
The ZooKeeper registry is automatically populated by Fabric when you deploy Web archives (WARs) or CXF based Web services.
The MQ gateway binds to a single IP port and can accept connections from OpenWire, MQTT, STOMP, AMQP or HTTP clients. When it receives an HTTP connection, it will pass that connection to the HTTP Gateway. For the other protocols, it uses the host the client was trying to connect to to look up a broker fabric group by the same name.