Resteasy 3 offers the same client side cache facility as Resteasy 2, but it is enabled differently, by way of org.jboss.resteasy.client.jaxrs.cache.BrowserCacheFeature, which implements the JAX-RS 2.0 class javax.ws.rs.core.Feature:

Client client = ClientBuilder.newClient();
String url = "http://localhost:8081/orders/{id}";
ResteasyWebTarget target = (ResteasyWebTarget) client.target(url);
BrowserCacheFeature cacheFeature = new BrowserCacheFeature();
target.register(cacheFeature);
String rtn = target.resolveTemplate("id", "1").request().get(String.class);
   

Client side caching also works for proxies:

@Path("/orders")
public interface OrderServiceClient
{
   @Path("{id}")
   @GET
   @Produces("application/xml")
   public Order getOrder(@PathParam("id") String id);
}
...
Client client = ClientBuilder.newClient();
String "http://localhost:8081";
ResteasyWebTarget target = (ResteasyWebTarget) client.target(url);
BrowserCacheFeature cacheFeature = new BrowserCacheFeature();
target.register(cacheFeature);
OrderServiceClient orderService = target.proxy(OrderServiceClient.class);