WP_REST_Response - How to return Gzip answer and add Content-encoding header?

This code runs correctly :

function get_travelbooks($request)
{
    global $tsp_mdlObj;

    $result = $tsp_mdlObj-read_travelbooks();

    return new WP_REST_Response($result, 200);

}

Now I would like send a gzip answer. So I try :

function get_travelbooks($request)
{
    global $tsp_mdlObj;

    $result = $tsp_mdlObj-read_travelbooks();

    $result = gzencode(json_encode($result), 9);

    $response = new WP_REST_Response($result, 200);

    $response-header('Content-Encoding', 'gzip');

    return $response;

}

But this code doesn't work.

The content of $result before gzencode(json_encode is an array :

Array
(
    [0] = stdClass Object
        (
            [id] = 5
            [name] = travel 2021
        )

    [1] = stdClass Object
        (
            [id] = 4
            [name] = travel 2020
        )

    [2] = stdClass Object
        (
            [id] = 3
            [name] = travel 2019
        )
)

hereafter is the register_rest_route used

add_action('rest_api_init', function () {
  register_rest_route( 'travelsteps/v1', 'travelbooks',array(
                'methods'  = 'GET',
                'callback' = 'get_travelbooks',
                'permission_callback' = '__return_true',
      ));
});

I got the following error in console :

xhr.js:177 GET xxxxxx/v1/travelbooks net::ERR_CONTENT_DECODING_FAILED 200 (OK)

And the network header Content-Encoding: gzip is present.

And inside the network response tab i get the following message :

no data found for resource with given identifier

Any suggestion to fix this problem or a resource regarding gzip for a wp custom end point api rest. Thanks.