According to Mozilla, the [https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/204 204 No Content] response "indicates that a request has succeeded but that the client doesn't need to navigate away from its current page". However, when Firefox receives such a code in response to a status code, it triggers the `window.onbeforeunload` event and any associated handlers. This has side-effects such as closing any open websocket connections associated with the page, re-rendering the DOM (which fires various lifecycle methods in single page apps), and other similar activities that are generally associated with navigating away from a page. Is this behavior intended or documented anywhere? Or should it be considered a bug?