A common solution to the problem of chatty interfaces with backend services, or the need to vary content for different types of devices, is to have a server-side aggregation endpoint, or API gateway. This can marshal multiple backend calls, vary and aggregate content if needed for different devices, and serve it up, as we see in Figure 4-9. I’ve seen this approach lead to disaster when these server-side endpoints become thick layers with too much behavior. They end up getting managed by separate teams, and being another place where logic has to change whenever some functionality changes.
