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What is the expected navigation behavior of a 204 response to a form post.

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According to Mozilla, the 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?

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?

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--edit-- There is a typo. The first sentence of the second paragraph should read: "However, when Firefox receives such a code in response to a form post, it triggers ..."