The Access-Control-Expose-Headers response header indicates which headers can be exposed as part of the response by listing their names.

By default, only the 6 simple response headers are exposed:

If you want clients to be able to access other headers, you have to list them using the Access-Control-Expose-Headers header.

Header type Response header
Forbidden header name no


Access-Control-Expose-Headers: <header-name>, <header-name>, ...


A list of exposed headers consisting of zero or more header names other than the simple response headers that the resource might use and can be exposed.


To expose a non-simple response header, you can specify:

Access-Control-Expose-Headers: Content-Length

To additionally expose a custom header, like X-Kuma-Revision, you can specify multiple headers separated by a comma:

Access-Control-Expose-Headers: Content-Length, X-Kuma-Revision


Specification Status Comment
The definition of 'Access-Control-Expose-Headers' in that specification.
Living Standard  

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support4123.510124
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support2.1 Yes Yes4123.2 ?

Compatibility notes

See also

Document Tags and Contributors

 Contributors to this page: fscholz, Sebsonic
 Last updated by: fscholz,