Web features explorer - Connection allowlists

Web features explorer

The Connection-Allowlist HTTP response header limits which requests a page may initiate using fetch and other APIs.

Browser support

Chrome 152 Released on 2026-08-25
Chrome Android 152 Released on 2026-08-25
Edge Not supported
Firefox Not supported
Firefox for Android Not supported
Safari Not supported
Safari on iOS Not supported

MDN documentation

No MDN documentation found. You can search for the feature on MDN. If you believe that MDN has no documentation about this feature, you can open an issue on MDN's GitHub repository.

Specifications

Connection Allowlists, from Web Platform Incubator Community Group (W3C).

View as JSON | Edit this feature | Report an issue | Web-features entry: source, dist