The revolution of multi-screens leads to an increasing demand from users to access their data from any type of device. In parallel, the widespread adoption of social networks requires applications to be able to connect easily through homogeneous and easily scalable APIs (Application Programming Interface).

Today the majority of information exchange is done via the HTTP protocol, the Web communication standard foundation. To respond to market changes, a 4D developer must master these technologies to consume and publish Web services.

In this part, we describe the implementation of a Web Service with REST architecture. Its first goal is to provide a data service, offering homogeneous access to the data base actions: Create - Retrieve - Update -Delete forming the now famous acronym CRUD.

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