Magento 2 discards all session parameters

Question

I've written a magento controller which stores some filter information inside the customer session.

According to the magento 2 documentation I use dependency injection to let magento generate the session object for me:

/**
 * @var \Magento\Catalog\Model\Session
 */
protected $_filterSession;

/**
 * @param \Magento\Customer\Model\Session $filterSession
 */
public function __construct( \Magento\Customer\Model\Session $filterSession)
{
    $this->_filterSession = $filterSession;
}

The injection process is working quite well. I'm able to access the session, store a variable in it and return it on a further invocation.

But magento seems to discard the whole session information from time to time. I cannot exactly identify the moment magento discards the information, it seems kind of random.

Here is the code:

$this->_filterSession->setFrequency($frequency);
$frequency = $this->_filterSession->getFrequency();

I tried out different session scopes but the behaviour is the same.

After many attempts I tried to use the PHP-session to store the information, but even this session was discarded from time to time.

I don't know what I'm doing wrong or what could be the reason for this weird behaviour. Does anybody else have a similar problem or an idea whats the reason?

Thanks in advance, Thomas

Answer 1

This usually happens when the browser loses session cookies. You should check if domain name changes during the session when the variables are lost. Or with a different browser. Might be some misbehaving browser plugin. Or some Magento extension. Many Mageno 2 extensions currently are poorly written.

Answer 2

I had a similar problem using PHP. I had set session.referer_check. So, when a user was coming from an external page, the session was lost. If this is your problem, simply ini_set('session.referer_check', '');.