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fix: dead link. #6876

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Jun 3, 2020
Merged

fix: dead link. #6876

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2 changes: 1 addition & 1 deletion docs/content/middlewares/headers.md
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Expand Up @@ -311,7 +311,7 @@ This value can contains a list of allowed origins.
More information including how to use the settings can be found on:

- [Mozilla.org](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Origin)
- [w3](https://www.w3.org/TR/cors/#access-control-allow-origin-response-header)
- [w3](https://fetch.spec.whatwg.org/#http-access-control-allow-origin)
- [IETF](https://tools.ietf.org/html/rfc6454#section-7.1)

Traefik no longer supports the null value, as it is [no longer recommended as a return value](https://w3c.github.io/webappsec-cors-for-developers/#avoid-returning-access-control-allow-origin-null).
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