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Clients initiate requests to servers; servers process requests and return appropriate responses. Client / Server For example, clients are not concerned with data storage, and the Servers are not concerned with the user interface Stateless Each request from any client contains all of the information necessary to service the request, and any session state is held in the client Cacheable clients can cache responses and the server and responses must therefore, implicitly or explicitly, define themselves as cacheable, or not, Layered System client can’t tell what kind of server they are talking to. Is it the end point server or some middle tier caching server along the way. It makes no difference to them. Uniform Interface A set of guiding principles that should be followed. Relating to the nature of how the data is represented and manipulated.
Benefits of REST
Examples of existing REST services - Twitter
11/16/12Drupal As A RESTful BackendFor Client Side ApplicationsFor Client Side Applications
REpresentational State Transfer • Architectural Style – Many ways to implement • 5 Primary Constraints to be considered “RESTful” – Client / Server – Stateless – Cacheable – Layered System – Uniform Interface
Services Module (3.x) – Creates URL callback endpoints for integrating external applications – Supports multiple interfaces including REST, XMLRPC, JSON, JSON-RPC, SOAP, AMF, etc.
Services Module (3.x) – Supports Drupal core resources, third party integration is done with modules – Authentication and OAUTH support – Performs a full bootstrap :( – Caching in 7.x-dev YAY! (Issue #1791978)
Services Endpoints Create: POST /[endpoint_path]/[resource] + body Retrieve: GET /[endpoint_path]/[resource]/[resource_id] Update: PUT /[endpoint_path]/[resource]/[resource_id] + body Delete: DELETE /[endpoint_path]/[resource]/[resource_id]