Facebook API - 请求期间的无限循环

Question

尝试使用Facebook PHP SDK，但如果我请求某些权限，应用程序会生成循环重定向，直到出现错误。有人知道为什么吗？遵循代码。感谢。

***<?php
require 'src/facebook.php';

$facebook = new Facebook(array(
  'appId'  => 'XXXXXXXXXXXXXXXXX',
  'secret' => 'XXXXXXXXXXXXXXXXXXXXX',
));


// permitir upload de fotos
$facebook->setFileUploadSupport(true);
$user = $facebook->getUser();
if ($user)
{
        $permissions = $facebook->api("/me/permissions");

        if (!array_key_exists('publish_stream', $permissions['data'][0])) {

                header( "Location: " . $facebook->getLoginUrl(array("scope" => "publish_stream")) );
                exit;
        }

        echo "Pode publicar as fotos";

} else {
        $loginUrl = $facebook->getLoginUrl();
        header("Location: $loginUrl");
        exit;
}***