why I can't get any respones ? here my get image function, when I call the function, it returns nothing

public function getImage() {

    $url = 'http://10.125.3.18:9292/v2/images';

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HTTPGET, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $this->authToken());

    $response = curl_exec($ch);
    curl_close($ch);

    $result = json_decode($response);
    return $result;
}