With a lot of mobile applications being used in the market, it becomes essential to enable faster transmission of large chunks of data over a network. RESTEasy provides the GZIP compression/decompression feature. When the response body is plain text, it can be easily compressed on the server side and then decompressed on the client side. RESTEasy accomplishes this with the @GZIP annotation applied at the method level, as shown ahead:

 /**
 * Returns list of departments
 *
 */
 @GET
 @Produces(MediaType.APPLICATION_JSON)
 @GZIP
 public List<Departments> findAllDepartments() {
 //Find all departments from the data store and return compressed response
 javax.persistence.criteria.CriteriaQuery cq = entityManager.getCriteriaBuilder().createQuery();
 cq.select(cq.from(Departments.class));
 List<Departments> departments = entityManager.createQuery(cq).getResultList();
 return departments;
 }

The @GZIP annotation of RESTEasy takes care of compressing the response message body and similarly when a server receives a request with content-encoding equal to GZIP then the request message body is decompressed automatically.