REST - Representational state transfer
Light provides a plugin architecture and dozens of middleware handlers to address cross-cutting concerns in general. When you decide to build an API or service, you have to choose from different styles and the corresponding frameworks.
Chances are you are building a public Web API and want to follow RESTful style to make sure everyone can understand and consume it.
The light-rest-4j is a framework that is designed to speed up RESTful API development and deployment. On top of light-4j, it has several middleware handlers designed explicitly around OpenAPI 3.0 specifications.