Available in Chrome 39+ | View on GitHub | Browse Samples
Beacon lets you asynchronously transfer small HTTP data from the User Agent to a web server. It can be used e.g. to send analytics or diagnostics code without delaying the page's unload or affecting the performance of the next navigation.
The sample below sends a beacon to a sample server at
https://putsreq.herokuapp.com/4GE2nVUuDoDGsNyKES2G on unload.
Close this page and visit the
PutsReq inspect page
to see if the beacon data was received.