Most modern browsers include the native method navigator.sendBeacon() . It asynchronously sends a small amount of data over HTTP to a web server. AppMeasurement can use the navigator.sendBeacon() method if the useBeacon variable is enabled. It is useful for exit links and other situations where you want to send information before the page unloads.
If useBeacon is enabled, the next hit sent to Adobe uses the browser's navigator.sendBeacon() method instead of a standard GET image request. This variable applies to both s.t() and s.tl() image requests. It requires AppMeasurement 2.17.0 or higher.
AppMeasurement automatically enables useBeacon for exit link image requests.
The useBeacon variable is ignored when the visitor uses a browser that does not support navigator.sendBeacon() . Use of this variable requires AppMeasurement 2.16.0 or higher.
Use Beacon in Adobe Experience Platform Launch
There is not a dedicated field in Launch to use this variable. Use the custom code editor, following AppMeasurement syntax.
s.useBeacon in AppMeasurement and Launch custom code editor
The s.useBeacon variable is a boolean that determines if AppMeasurement uses the browser's navigator.sendBeacon() method. Its default value is false . Set this variable to true before calling a tracking function if you want to use the asynchronous nature of navigator.sendBeacon() .
s.useBeacon = true;
After a tracking call runs, this variable is reset to false . If your implementation sends multiple image requests in the same page load (such as single-page applications), set this variable to true before each tracking call.