@Override
    protected void doApply(final ApiResponse response, final IPolicyContext context, final RateLimitingConfig config,
            final IPolicyChain<ApiResponse> chain) {
        Map<String, String> headers = context.getAttribute("rate-limit-response-headers", null); //$NON-NLS-1$
        if (headers != null) {
            response.getHeaders().putAll(headers);
        }
        super.doApply(response, context, config, chain);
    }
@see io.apiman.gateway.engine.policies.AbstractMappedPolicy#doApply(io.apiman.gateway.engine.beans.ApiResponse, io.apiman.gateway.engine.policy.IPolicyContext, java.lang.Object, io.apiman.gateway.engine.policy.IPolicyChain)
gateway/engine/policies/src/main/java/io/apiman/gateway/engine/policies/RateLimitingPolicy.java