Timing-Allow-Origin

The Timing-Allow-Origin response header specifies origins that are allowed to see values of attributes retrieved via features of the Resource Timing API, which would otherwise be reported as zero due to cross-origin restrictions.

Header type Response header
Forbidden header name no

Syntax

Timing-Allow-Origin: *
Timing-Allow-Origin: <origin>[, <origin>]*

Directives

*
The server may specify "*" as a wildcard, thereby allowing any origin to see timing resources.
<origin>
Specifies a URI that may see the timning resources. You can specify multiple origins, separated by commas.

Examples

To allow any resource to see timing resources:

Timing-Allow-Origin: *

To allow https://developer.mozilla.org to see timing resources, you can specify:

Timing-Allow-Origin: https://developer.mozilla.org

Specifications

Specification Status Comment
Resource Timing Level 3
The definition of 'Timing-Allow-Origin' in that specification.
Editor's Draft Initial definition.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic Support (Yes) ? (Yes) ? (Yes) (Yes)
FeatureAndroidChrome for AndroidEdge mobileFirefox for AndroidIE mobileOpera AndroidiOS Safari
Basic Support (Yes) (Yes) ? (Yes) ? (Yes) (Yes)

See also

Document Tags and Contributors

 Contributors to this page: chrisdavidmills
 Last updated by: chrisdavidmills,