[Facebook Connect] FacebookRedirectLoginHelper->getSessionFromRedirect() renvoie toujours "null"

J'ai résolu seul le problème, à force de recherches. Apparemment, l'appel à FacebookRedirectLoginHelper::getLoginUrl() modifie un attribut de l'objet qui le rend impropre à l'état "connecté". De plus, des inclusions manquaient. Voici le nouveau code, pour un appel et une redirection sur la même page.

Code:

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<?php
	session_start();
 
	$siteUrl = "http://proj0.gerkindevelopment.net";
	print('<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8" />
        <link rel="stylesheet" href="Ressources/StyleStd.css" />
        <link rel="stylesheet" href="Ressources/StyleHeadFoot.css" />
        <title>Login</title>
    </head>
	
	<body>
		<h1>Login test</h1>');
	$facebookConnect = "../../../include/php/fbconnect/";
	if(!file_exists($facebookConnect))
		print("<p>Cannot find directory \"fbconnect\", operation aborted.</p>");
 
require_once($facebookConnect.'src/Facebook/FacebookSession.php');
require_once($facebookConnect.'src/Facebook/FacebookRedirectLoginHelper.php');
require_once($facebookConnect.'src/Facebook/FacebookRequest.php');
require_once($facebookConnect.'src/Facebook/FacebookResponse.php');
require_once($facebookConnect.'src/Facebook/FacebookSDKException.php');
require_once($facebookConnect.'src/Facebook/FacebookRequestException.php');
require_once($facebookConnect.'src/Facebook/FacebookAuthorizationException.php');
require_once($facebookConnect.'src/Facebook/GraphObject.php');
require_once($facebookConnect.'src/Facebook/GraphUser.php');
require_once($facebookConnect.'src/Facebook/GraphSessionInfo.php');
 
require_once($facebookConnect.'src/Facebook/HttpClients/FacebookHttpable.php' );
require_once($facebookConnect.'src/Facebook/HttpClients/FacebookCurl.php' );
require_once($facebookConnect.'src/Facebook/HttpClients/FacebookCurlHttpClient.php' );
require_once($facebookConnect.'src/Facebook/Entities/AccessToken.php' );
require_once($facebookConnect.'src/Facebook/Entities/SignedRequest.php' );
 
use Facebook\FacebookSession;
use Facebook\FacebookRedirectLoginHelper;
use Facebook\FacebookRequest;
use Facebook\FacebookResponse;
use Facebook\FacebookSDKException;
use Facebook\FacebookRequestException;
use Facebook\FacebookAuthorizationException;
use Facebook\GraphObject;
use Facebook\GraphUser;
use Facebook\GraphSessionInfo;
 
	FacebookSession::setDefaultApplication('1529012227337421', 'my_secret_that_i_wont_give_you');
 
	$helper = new FacebookRedirectLoginHelper($siteUrl.'/Content/answer.php?article='.$_GET['article']);
 
	try
	{
		$session = $helper->getSessionFromRedirect();
	}
	catch(FacebookRequestException $ex)
	{
		print('<p>FacebookRequestException: '.$ex->getErrorType().'</p>');
	}
	catch(Exception $ex)
	{
		print('<p>Exception: '.$ex->getMessage().'</p>');
	}
 
	if ($session)
	{
		print('<p>Logged</p>');
	}
	else
	{
	  header('Location:'.$helper->getLoginUrl());
	  exit;
	}
 
	print('
	</body>
</html>');
?>

J'espère que ça peut aider ;)