@Override
    public IReadWriteStream<ApiResponse> getResponseDataHandler(ApiResponse response,
            IPolicyContext context, Object policyConfiguration) {
        return dataResponseHandler;
    }
@see io.apiman.gateway.engine.policy.IDataPolicy#getResponseDataHandler(io.apiman.gateway.engine.beans.ApiResponse, io.apiman.gateway.engine.policy.IPolicyContext, java.lang.Object)
gateway/engine/core/src/test/java/io/apiman/gateway/engine/util/PassthroughDataPolicy.java