Logical to physical address mapping for RabbitMQ

Example.cs

IServiceBus bus = ServiceBusFactory.New(c =>
      {
          c.ReceiveFrom("rabbitmq://logicalHost/my_queue");
          c.UseRabbitMq(r =>
              {
                  r.ConfigureHost("rabbitmq://logicalhost/", h =>
                      {
                          h.SetUsername("testUser");
                          h.SetPassword("test");

                          h.UsePhysicalHosts("rabbitmq://server_a/", "rabbitmq://server_b");
                      });
              });

          c.Subscribe(s => s.Handler<A>((context, message) => future.Complete(context)));
      }))

By configuring the system using logical hosts, the physical servers are decoupled from the message exchanges. The part that sucks is the headers such as SourceAddress point to addresses that do not exist. Therefore, it may be critical to come up with an additional dynamic header such as RabbitMQ-Physical-Hosts or something that gets set to the known physical servers at the time the message was sent. Seems like a lot of header traffic, but perhaps not.