Im not sure if this is a bug report or a missing feature. But I do need some help.

Symfony version(s) affected: 5.4

Description
Using the Runtime component and non-standard HTTP server, ie Bref, Swoole or RoadRunner seams to have an issue with sessions. I know @alexander-schranz have done some great work on that already. He also added #41390.

The sessions are not saved. I am not sure why. I assume it is because the PHP process handles multiple requests and Symfony does not really know when one session/request ends and the other start.

How to reproduce

I did spend some time to create a reproducer: https://github.com/Nyholm/sf-bref-session-issue
I also deployed it here: https://hb74khn5fk.execute-api.eu-central-1.amazonaws.com/
(it will be open for a few days)

You will see the issue as you cannot login.

Possible Solution
Not sure. I need some help finding the solution.

Additional context

This might be an issue in runtime/bref, or in a Symfony component. It might also require some changes in Symfony to make sure runtime/bref works perfectly.