This is still my code, because I edited it. Is this correct php code to redirect data from a source in xml and convert it in json? [closed]

Question is that is this correct code for wordpress site? When I tried it as a plugin the code broke my site with “redirect err”. What might be the problem officer?

<?php
/*
Plugin Name: External API XML to JSON
Plugin URI: http://erikilonen.com/
Description: Fetch XML from an external API and convert it to JSON.
Version: 1.0
Author: Erik Ilonen
Author URI: http://erikilonen.com/
*/
 
add_action('rest_api_init', function () {
    register_rest_route('external-api/v1', '/test/', array(
        'methods' => 'GET',
        'callback' => 'fetch_external_api_data',
    ));
});
 
function fetch_external_api_data(WP_REST_Request $request) {
    // Replace 'external_api_url' with the actual URL of the external API
    $response = wp_remote_get('https://web-api.tp.entsoe.eu/api?securityToken=MY_TOKEN&documentType=A44&processType=A16&outBiddingZone_Domain=10YFI-1--------U&In_Domain=10YFI-1--------U&Out_Domain=10YFI-1--------U&periodStart=202403040800&periodEnd=202403040900');
 
    if (is_wp_error($response)) {
        return new WP_Error('fetch_error', 'Error fetching external API data', array('status' => 500));
    }
 
    $body = wp_remote_retrieve_body($response);
    $xml = simplexml_load_string($body);
    $json = json_encode($xml);
    $data = json_decode($json, true); // Convert to associative array
 
    return new WP_REST_Response($data, 200);
}
 ?>