CORS in VRaptor 4

CORSController.java

import java.util.Set;

import javax.inject.Inject;

import br.com.caelum.vraptor.Controller;
import br.com.caelum.vraptor.Options;
import br.com.caelum.vraptor.Result;
import br.com.caelum.vraptor.controller.HttpMethod;
import br.com.caelum.vraptor.core.RequestInfo;
import br.com.caelum.vraptor.http.route.Router;
import br.com.caelum.vraptor.view.Results;

@Controller
public class CORSController {

	@Inject private Result result;
	@Inject private Router router;
	@Inject private RequestInfo requestInfo;

	@Options("/*")
	public void options() {
		Set<HttpMethod> allowed = router.allowedMethodsFor(requestInfo.getRequestedUri());
		String allowMethods = allowed.toString().replaceAll("\\[|\\]", "");

    		result.use(Results.status()).header("Allow", allowMethods);
    		result.use(Results.status()).header("Access-Control-Allow-Methods", allowMethods);
    		result.use(Results.status()).header("Access-Control-Allow-Headers", "Content-Type, accept, Authorization, origin");
    		result.use(Results.status()).noContent();
	}
}

CORSInterceptor.java

import javax.inject.Inject;
import javax.servlet.http.HttpServletRequest;

import br.com.caelum.vraptor.BeforeCall;
import br.com.caelum.vraptor.InterceptionException;
import br.com.caelum.vraptor.Intercepts;
import br.com.caelum.vraptor.Result;
import br.com.caelum.vraptor.view.Results;

@Intercepts
public class CORSInterceptor {
	
	@Inject private Result result;
	@Inject private HttpServletRequest request;
	
	@BeforeCall
	public void intercept() throws InterceptionException {
		//Fix your origin if possible for security reasons
		String origin = request.getHeader("origin") != null ? request.getHeader("origin") : "*";
		
		result.use(Results.status()).header("Access-Control-Allow-Origin", origin); 
		result.use(Results.status()).header("Access-Control-Allow-Credentials", "true");
    		result.use(Results.status()).header("Access-Control-Expose-Headers", "Content-Type, Location");
	}
}

Rafael, cara eu estava utilizando esse CORS tbm, porem ele da problemas na hora que tu precisa fazer um download. estou tentando arrumar uma solução se eu descobrir te aviso, se vc quiser pode dar uma olhada por ai tbm.. abracos