Modal released a feature called Sticky Sessions. It routes every request of a given session to the same container, even as the platform auto‑scales. Developers enable it by adding the @modal.sessioned() decorator to a Modal Server and using the SDK or HTTP API to start sessions. The system encodes routing info in a signed session token, so multiple clients can share the same state without disabling authentication.
Why it matters
It lets voice‑assistant, chat‑room and multiplayer‑game developers keep session state in memory without giving up serverless scaling.
