User Interface API Developer Guide
jNote: This release is in preview. Features described here don’t become generally available until the latest general availability date that Salesforce announces for this release. Before then, and where features are noted as beta, pilot, or developer preview, we can’t guarantee general availability within any particular time frame or at all. Make your purchase decisions only on the basis of generally available products and features.
User Interface API Response Bodies
A request to a resource returns a response body. Some response bodies also contain
nested response bodies.
A request to a resource always returns an HTTP response code, whether the request was successful or not.