if ($json_api_response === false) {
    //try via http
    $api_url = 'http://api.fixer.io/latest';
    $json_api_response = td_remote_http::get_page($api_url, __CLASS__);
    if ($json_api_response === false) {
        td_log::log(__FILE__, __FUNCTION__, 'Api call failed', $api_url);
        return 'Api call failed';
    }
}