The JAX-RS resource methods return type is generally based on the entity being operated on. For example, getDepartment returns the Department type. This return value is wrapped by JAX-RS in the default response message body and response status; additional metadata like content length, media type are added by the default JAX-RS implementation provider, which is not transparent to us. If we intend to explicitly control the response sent back to the client, the resource methods can return an instance of javax.ws.rs.core.Response. The Response class is an abstract class which contains methods required to get access to the different attributes of Response sent back to the client. Listed here are a few key methods of Response class: