Cross-Origin-Resource-Policy (CORP) header

The HTTP Cross-Origin-Resource-Policy response header (CORP) indicates that the browser should block no-cors cross-origin or cross-site requests to the given resource.

It specifies resource owner's policy for what sites/origins should be allowed to load this resource.

Syntax

Cross-Origin-Resource-Policy: same-site | same-origin | cross-origin

Directives

same-site

Resources can only be loaded from the same site.

same-origin

Resources can only be loaded from the same origin.

cross-origin

Resources can be loaded by any other origin/website.

Examples

For more examples, see https://resourcepolicy.fyi/.

Disallowing cross-origin no-cors requests

The Cross-Origin-Resource-Policy header below will cause compatible user agents to disallow cross-origin no-cors requests:

Cross-Origin-Resource-Policy: same-origin

Specifications

• Fetch

See also

• Cross-Origin Resource Policy (CORP) explainer
• Consider deploying Cross-Origin Resource Policy
• Cross-Origin-Embedder-Policy
• Access-Control-Allow-Origin