Problem with HTTP API

Hi,
I’ve a problem with the WordPress API in the subject. I posted the code below: this returns blank page, instead it should return an HTTP Response or a WP_Error, but nothing. Why?

<?php

class The_Crawler {

    public function __construct() { }

    public function get_classifieds( $urls ) {

        foreach($urls as $url) {

            $response = wp_remote_get( $url );

            print_r($response);

            if ( is_array( $response ) && ! is_wp_error( $response ) ) {
                $body = wp_remote_retrieve_body( $response ); 

                $pattern = '<h3\sclass="title">.*</h3>';
                preg_match( $pattern, $body, $titles );
                print_r( $titles );
            }

        }

    }

}

$urls = [
    'https://www.kijiji.it/motori/moto-e-scooter/'
];

The_Crawler::get_classifieds( $urls );

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