Origin-Agent-Cluster
Requests origin-keyed browser agent clustering for a document.
Support in current browsers
Checked against the current browser versions recorded in MDN browser data 8.1.5.
| Browser | Minimum | Outcome | Reason |
|---|---|---|---|
| Chrome | 155 | Works | Every required mapped BCD feature is available without a recorded qualification. |
| Edge | 154 | Works | Every required mapped BCD feature is available without a recorded qualification. |
| Firefox | 157 | Works | Every required mapped BCD feature is available without a recorded qualification. |
| Safari | 27 | Unknown | BCD does not provide enough comparable support data for this browser baseline. |
| Chrome for Android | 155 | Works | Every required mapped BCD feature is available without a recorded qualification. |
| Firefox for Android | 157 | Works | Every required mapped BCD feature is available without a recorded qualification. |
| Safari on iOS | 27 | Not supported | At least one required mapped feature is not available at this browser baseline. |
| Android WebView | 155 | Works | Every required mapped BCD feature is available without a recorded qualification. |
| Samsung Internet | 30.0 | Works | Every required mapped BCD feature is available without a recorded qualification. |
How support changed
Each segment groups recorded releases with the same result. Gaps between recorded versions are not filled in. This is support at each release, rather than the planner’s check of every release above a minimum.
Chrome
http.headers.Origin-Agent-Cluster- 1 – 8988 recorded releasesNot supported
- 90 – 15566 recorded releasesWorks
Edge
http.headers.Origin-Agent-Cluster- 12 – 8917 recorded releasesNot supported
- 90 – 15465 recorded releasesWorks
Firefox
http.headers.Origin-Agent-Cluster- 1 – 137140 recorded releasesNot supported
- 138 – 15720 recorded releasesWorks
Safari
http.headers.Origin-Agent-Cluster- 1 – 2761 recorded releasesUnknown
- Support begins at an imprecise version: preview
Chrome for Android
http.headers.Origin-Agent-Cluster- 18 – 8965 recorded releasesNot supported
- 90 – 15566 recorded releasesWorks
Firefox for Android
http.headers.Origin-Agent-Cluster- 4 – 137121 recorded releasesNot supported
- 138 – 15720 recorded releasesWorks
Safari on iOS
http.headers.Origin-Agent-Cluster- 1 – 2758 recorded releasesNot supported
Android WebView
http.headers.Origin-Agent-Cluster- 1 – 8960 recorded releasesNot supported
- 90 – 15566 recorded releasesWorks
Samsung Internet
http.headers.Origin-Agent-Cluster- 1.0 – 14.233 recorded releasesNot supported
- 15.0 – 30.019 recorded releasesWorks
BCD 8.1.5 · catalogue 2.3.0. Source corrections can change this trace without a new browser release.
What this feature can and cannot do
Helps protect against
- Unnecessary same-site process sharing
- Origin isolation ambiguity
Does not guarantee
- Complete process isolation
- Application authorisation
- Browser defects
What you need before using it
- Consistent delivery across an origin
Fallback to keep in place
Use separate origins for security boundaries and avoid relying on process placement.