epoch milliseconds on the device
Optionaldeliversink sends the event to the server half in the flush; absent, the worker replays it to its URL
OptionalmethodGET for a pixel beacon; absent means POST
Optionaloriginthe origin of a held cross-origin request; absent for the site's own
Optionalsearchthe query string of the original URL, with its leading ?
Optionaluntilepoch milliseconds after which the worker drops the event instead of sending it; never sent
Optionalvendorthe collector entry that matched, which sets the age cap
One request the worker held back: where it was going, what it carried and when it happened. A same-origin one leaves
originout. A request to another origin names it, with thevendorwhose delay cap applies and, whendeliverissink, the server half forwards it.