EandrewJones opened a new issue, #399:
URL: https://github.com/apache/flagon-useralejs/issues/399
## Problem
The `sendOnClose` method to flush logs before the user closes/tabs away from
the client app does not utilize any header information, nor can it.
```
/**
* Attempts to flush the remaining logs when the window is closed.
* @param {Array} logs Array of logs to be flushed.
* @param {Object} config Configuration object to be read from.
*/
export function sendOnClose(logs, config) {
window.addEventListener("pagehide", function () {
if (config.on && logs.length > 0) {
navigator.sendBeacon(config.url, JSON.stringify(logs));
logs.splice(0); // clear log queue
}
});
}
```
## Cause
`navigator.sendBeacon` does not support auth headers, so this will fail if
auth is required.
## Solution
The alternative is to use `fetch()` with `keepalive: true` as per [official
docs](https://developer.mozilla.org/en-US/docs/Web/API/Navigator/sendBeacon#description)
and [SO suggestions](https://stackoverflow.com/a/73062712/9263449).
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