Frontend & browser·The network from the browser
you sent the analytics event on page unload and it actually arrived, instead of being cancelled.
Beacon
Also calledsendBeacon, keepalive request
A small request the browser promises to deliver even after the page goes away, via `navigator.sendBeacon` or `fetch` with `keepalive`. It exists because unload handlers are the one place a normal request is routinely killed mid-flight. The payload limit is small, the method is POST, and you get no response back, so it is for telemetry and nothing else.