You may use the javax.ws.rs.ext.JAXRSWriterInterceptor interface to intercept and manipulate the outgoing message body. The following example illustrates the use of WriterInterceptor to compress the response body content:

//Other imports are omitted for brevity 
import java.util.zip.GZIPOutputStream; 
import javax.ws.rs.WebApplicationException; 
import javax.ws.rs.core.MultivaluedMap; 
import javax.ws.rs.ext.Provider; 
import javax.ws.rs.ext.WriterInterceptor; 
import javax.ws.rs.ext.WriterInterceptorContext; 
 
@Provider 
public class JAXRSWriterInterceptor implements WriterInterceptor { 
    @Override 
    public void aroundWriteTo(WriterInterceptorContext context) 
       throws IOException,  
       WebApplicationException { 
       MultivaluedMap<String, Object> headers =  
           context.getHeaders(); 
       headers.add("Content-Encoding", "gzip"); 
       OutputStream outputStream =  
           context.getOutputStream(); 
       context.setOutputStream(new  
            GZIPOutputStream(outputStream)); 
       context.proceed(); 
    } 
} 

You will use the same interface contract for building the write interceptors for the client side use as well. You can register the WriterInterceptor interface to the JAX-RS client by calling the register() method on the javax.ws.rs.client.Client object.