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An application client, such as a native mobile application, could make RESTful HTTP requests to the individual services
On the surface this might seem attractive. However, there is likely to be a significant mismatch in granularity between the APIs of the individual services and data required by the clients. For example, displaying one web page could potentially require calls to large numbers of services. Amazon.com, for example, describes how some pages require calls to 100+ services. Making that many requests, even over a high-speed internet connection, let alone a lower-bandwidth, higher-latency mobile network, would be very inefficient and result in a poor user experience.

A much better approach is for clients to make a small number of requests per-page, perhaps as few as one, over the Internet to a front-end server known as an API gateway

http://www.infoq.com/articles/microservices-intro