Representational State Transfer (REST) style web services are very popular. They offer simplicity and flexibility of choosing the content in which they can be consumed. This session focuses on the pros and cons of using binary format as a content for the RESTful web services. In this talk, Google Protocol Buffers will be used as an example content for Restful Web Services. We also will compare other options for data serialization systems such as Avro, Java objects in terms of performance, ease of development.