@Override
    public IReadWriteStream<ApiRequest> getRequestDataHandler(ApiRequest request,
            IPolicyContext context, Object policyConfiguration) {
        return null;
    }
@see io.apiman.gateway.engine.policy.IDataPolicy#getRequestDataHandler(io.apiman.gateway.engine.beans.ApiRequest, io.apiman.gateway.engine.policy.IPolicyContext, java.lang.Object)
plugins/jsonp-policy/src/main/java/io/apiman/plugins/jsonp_policy/JsonpPolicy.java