Much like the OAuth Test Page, this page is designed to help library authors and developers a way to understand and audit the various encryption bits needed to send data via WebPush.
Please be advised that sending Data via WebPush is still experimental. Currently this is only supported on Firefox version 45 or later.
This demo is beta quality. While it works, you may need to refresh several times before things are working correctly. In addition, there's a known bug with fetch() which prevents the page from sending headers as part of the outbound request. Using the curl output should work, however.