Attribution-Reporting-Eligible header

Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

The HTTP Attribution-Reporting-Eligible request header indicates that the corresponding response is eligible to register an attribution source or trigger.

This header is never set manually and is instead sent by the browser in response to various HTML element or JavaScript request settings. Depending on the allowed registrations specified in the Attribution-Reporting-Eligible value, the server is expected to respond with either an Attribution-Reporting-Register-Source or Attribution-Reporting-Register-Trigger header to complete the registration of an attribution source or trigger, respectively.

See the Attribution Reporting API for more details.

Header type	Request header
Forbidden request header	No

Syntax

http

Attribution-Reporting-Eligible: <allowed-registrations>

Directives

<allowed-registrations>

A structured-header dictionary representing the registrations allowed in the corresponding response. Possible keys are:

event-source: An event-based attribution source can be registered.
navigation-source: A navigation-based attribution source can be registered.
trigger: An attribution trigger can be registered.

Every response in a redirect chain can register at most one source or one trigger.

Examples

http

Attribution-Reporting-Eligible: trigger

Specifications

Specification
Attribution Reporting # attribution-reporting-eligible

Browser compatibility

	desktop					mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS
`Attribution-Reporting-Eligible` Deprecated	Chrome – Full support Chrome 117 (Release date: 2023-09-12) footnote Full support	Edge – Full support Edge 117 (Release date: 2023-09-15) footnote Full support	Firefox – No support Firefox footnote No support	Opera – Full support Opera 103 (Release date: 2023-10-03) footnote Full support	Safari – No support Safari footnote No support	Chrome Android – Full support Chrome Android 117 (Release date: 2023-09-12) footnote Full support	Firefox for Android – No support Firefox for Android footnote No support	Opera Android – Full support Opera Android 78 (Release date: 2023-10-23) footnote Full support	Safari on iOS – No support Safari on iOS footnote No support	Samsung Internet – Full support Samsung Internet 24 (Release date: 2024-01-25) footnote Full support	WebView Android – Full support WebView Android 117 (Release date: 2023-09-12) footnote Full support	WebView on iOS – No support WebView on iOS footnote No support

Tip: you can click/tap on a cell for more information.

Full support: Full support
No support: No support
: Deprecated. Not for use in new websites.