# Unload Beacon for Vaadin Flow > Starting with [Vaadin 24.1](https://vaadin.com/blog/vaadin-flow-24.1-drastically-reduces-memory-usage) this add-on is obsolete! This add-on uses the [Beacon API](https://developer.mozilla.org/en-US/docs/Web/API/Beacon_API) to signal whenever a page is [unloaded](https://developer.mozilla.org/en-US/docs/Web/API/Window/unload_event) in the browser in order to immediately close the UI on the server. This allows for much earlier clean up of UIs and associated resources than having to wait for missed heart beats or session timeouts to trigger a UI's eventual disposal. Of course this is only on a best effort basis as there will always be situations where the browser is simply "gone" and no beacon will or can be sent. This add-on in based on a technique demonstrated in the [Vaadin Cookbook](https://cookbook.vaadin.com/notice-closed). ## Getting started In a Spring Boot application this add-on will work automatically once it has been added as dependency. For other frameworks see [VaadinServiceInitListener](https://vaadin.com/docs/current/flow/advanced/tutorial-service-init-listener.html) on how to register the `UnloadBeaconServiceInitListener` manually.