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Add Note About Cross Origin Retrieval Header for Delegation File #1029

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Jun 21, 2024
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2 changes: 1 addition & 1 deletion FLEDGE.md
Original file line number Diff line number Diff line change
Expand Up @@ -261,7 +261,7 @@ If any of these per-owner limits are exceeded, the interest group(s) that would

#### 1.3 Permission Delegation

When a frame navigated to one domain calls joinAdInterestGroup(), leaveAdInterestGroup(), or clearOriginJoinedAdInterestGroups() for an interest group with a different owner, the browser will fetch the URL https://owner.domain/.well-known/interest-group/permissions/?origin=frame.origin, where `owner.domain` is domain that owns the interest group and `frame.origin` is the origin of the frame. The fetch uses the `omit` [credentials mode](https://fetch.spec.whatwg.org/#concept-request-credentials-mode), using the [Network Partition Key](https://fetch.spec.whatwg.org/#network-partition-keys) of the frame that invoked the method. To avoid leaking cross-origin data through the returned Promise unexpectedly, the fetch uses the `cors` [mode](https://fetch.spec.whatwg.org/#concept-request-mode). The fetched response should have a JSON MIME type and be of the format:
When a frame navigated to one domain calls joinAdInterestGroup(), leaveAdInterestGroup(), or clearOriginJoinedAdInterestGroups() for an interest group with a different owner, the browser will fetch the URL https://owner.domain/.well-known/interest-group/permissions/?origin=frame.origin, where `owner.domain` is domain that owns the interest group and `frame.origin` is the origin of the frame. The fetch uses the `omit` [credentials mode](https://fetch.spec.whatwg.org/#concept-request-credentials-mode), using the [Network Partition Key](https://fetch.spec.whatwg.org/#network-partition-keys) of the frame that invoked the method. To avoid leaking cross-origin data through the returned Promise unexpectedly, the fetch uses the `cors` [mode](https://fetch.spec.whatwg.org/#concept-request-mode). The fetched response should have a JSON MIME type, have a `Access-Control-Allow-Origin` that allows it to load from the calling origin, and be of the format:

```
{ "joinAdInterestGroup": true/false,
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