@Override
        public ContentChannel handleRequest(final Request request, final ResponseHandler handler) {
            final Response response = new Response(OK);
            response.headers().add(headerName, headerValue);
            return handler.handleResponse(response);
        }
@author Oyvind Bakksjo
@author Simon Thoresen Hult
@author bjorncs
container-core/src/test/java/com/yahoo/jdisc/http/server/jetty/HttpServerTest.java