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[explainer] Add alternative approch discussions to fetchLater #81

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Jul 26, 2023
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[explainer] Add alternative approch discussions to fetchLater #81

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26 changes: 26 additions & 0 deletions docs/fetch-later-api.md
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Expand Up @@ -138,6 +138,32 @@ class PendingBeacon {
}
```

## Alternatives Considered

### 1. BackgroundSync API

The [Background Synchronization API][backgroundsync-api] allows web applications to defer requests to their service worker to handle at a later time, if the device is offline.

However, to use the API requires the control over a service worker from the top-level window open for the origin, which is impossible for 3rd party iframes that want to perform beaconing.

Note that there are discussions ([#3], [#30]) to address PendingBeacon (or fetchLater)'s privacy requirements by reusing BackgroundSync's access permission.

[backgroundsync-api]: https://github.com/WICG/background-sync/blob/main/explainers/sync-explainer.md#the-api
[#3]: https://github.com/WICG/pending-beacon/issues/3#issuecomment-1531639163
[#30]: https://github.com/WICG/pending-beacon/issues/30#issuecomment-1333869614

### 2. BackgroundFetch API

The [Background Fetch API][backgroundfetch-api] provides a way for service workers to defer processing until a user is connected.

Similar to [BackgroundSync API](#1-backgroundsync-api), using BackGroundFetch also requires the control over a service worker, which is impossible for 3rd party iframes that want to perform beaconing.

[backgroundfetch-api]: https://wicg.github.io/background-fetch/

### 3. Other Alternatives

See also PendingBeacon's [Alternative Approaches](alternative-approaches.md).

## Open Discussions

See [Deferred fetching PR](https://github.com/whatwg/fetch/pull/1647).
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