Set HTTP code onException with Camel and Restlet

Using the Restlet component in an Apache Camel project, I am not able to set the HTTP status code on the response in onException.

Consider a Camel RouteBuilder configured like this:

onException(Exception.class)
  .handled(true)
  .process(new FailureResponseProcessor());

from("restlet:http://example.com/foo")
  .process(fooProcessor)
  .to("file:data/outbox");

In the FailureResponseProcessor I try to set the HTTP response code for Restlet:

public void process(Exchange exchange) throws Exception {
  Response response = exchange.getIn()
                              .getHeader(RestletConstants.RESTLET_RESPONSE,
                                         Response.class);
    response.setStatus(Status.SERVER_ERROR_INTERNAL);
}

This does not work. The status of the the HTTP response is always 200 OK.

What is necessary to effecively set the HTTP status code?

Here you are just retrieving the response object and changing it. This does not propagate down the route. You need to set the header after modifying the object.

exchange.getIn().setHeader(RestletConstants.RESTLET_RESPONSE, response);

Thanks.