403 来自外部网站的 PHP cURL 错误

Question

我试图从外部网站获取字符串，但收到 403 错误。我尝试过使用自定义用户代理并出现相同的错误。您能检查一下并帮我修复它吗？

代码：

$agent= 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.0.3705; .NET CLR 1.1.4322)';
function file_get_contents_curl($url) {
    $ch = curl_init();

    curl_setopt($ch, CURLOPT_AUTOREFERER, TRUE);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);   
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
    curl_setopt($ch, CURLOPT_USERAGENT, $agent);   
    curl_setopt($ch, CURLOPT_VERBOSE, true);    

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

    return $data;
}
$homepage = file_get_contents_curl("https://www.transunion.com/");
echo $homepage;

帮我解决这个问题。