On: Reliably Send an HTTP Request as a User Leaves a P...

[janci]

Weird window.onbeforeunload was not mentioned

[openplatypus → janci]

Probably because this is discouraged.

Check here: https://developer.mozilla.org/en-US/docs/Web/API/Navigator/s...

> However, this is extremely unreliable. In many situations, especially on mobile, the browser will not fire the unload, beforeunload, or pagehide events.

[XCSme → janci]

Because it is synchronous/thread-blocking.