diff --git a/src/Symfony/Bundle/FrameworkBundle/Resources/config/session.xml b/src/Symfony/Bundle/FrameworkBundle/Resources/config/session.xml
index de45365751be9..a6a129ee0a73e 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Resources/config/session.xml
+++ b/src/Symfony/Bundle/FrameworkBundle/Resources/config/session.xml
@@ -48,6 +48,10 @@
+
+
+
+
diff --git a/src/Symfony/Component/HttpKernel/EventListener/SaveSessionListener.php b/src/Symfony/Component/HttpKernel/EventListener/SaveSessionListener.php
new file mode 100644
index 0000000000000..d9eaa68f49ae7
--- /dev/null
+++ b/src/Symfony/Component/HttpKernel/EventListener/SaveSessionListener.php
@@ -0,0 +1,67 @@
+
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpKernel\EventListener;
+
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+use Symfony\Component\HttpKernel\KernelEvents;
+
+/**
+ * Saves the session, in case it is still open, before sending the response/headers.
+ *
+ * This ensures several things in case the developer did not save the session explicitly:
+ *
+ * * If a session save handler without locking is used, it ensures the data is available
+ * on the next request, e.g. after a redirect. PHPs auto-save at script end via
+ * session_register_shutdown is executed after fastcgi_finish_request. So in this case
+ * the data could be missing the next request because it might not be saved the moment
+ * the new request is processed.
+ * * A locking save handler (e.g. the native 'files') circumvents concurrency problems like
+ * the one above. But by saving the session before long-running things in the terminate event,
+ * we ensure the session is not blocked longer than needed.
+ * * When regenerating the session ID no locking is involved in PHPs session design. See
+ * https://bugs.php.net/bug.php?id=61470 for a discussion. So in this case, the session must
+ * be saved anyway before sending the headers with the new session ID. Otherwise session
+ * data could get lost again for concurrent requests with the new ID. One result could be
+ * that you get logged out after just logging in.
+ *
+ * This listener should be executed as one of the last listeners, so that previous listeners
+ * can still operate on the open session. This prevents the overhead of restarting it.
+ * Listeners after closing the session can still work with the session as usual because
+ * Symfonys session implementation starts the session on demand. So writing to it after
+ * it is saved will just restart it.
+ *
+ * @author Tobias Schultze
+ */
+class SaveSessionListener implements EventSubscriberInterface
+{
+ public function onKernelResponse(FilterResponseEvent $event)
+ {
+ if (HttpKernelInterface::MASTER_REQUEST !== $event->getRequestType()) {
+ return;
+ }
+
+ $session = $event->getRequest()->getSession();
+ if ($session && $session->isStarted()) {
+ $session->save();
+ }
+ }
+
+ public static function getSubscribedEvents()
+ {
+ return array(
+ // low priority but higher than StreamedResponseListener
+ KernelEvents::RESPONSE => array(array('onKernelResponse', -1000)),
+ );
+ }
+}
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