Note: Due to a bug in Chrome, setting Cross-Origin-Resource-Policy can break PDF rendering, preventing visitors from being able to read past the first page of some PDFs. Due to a bug in Firefox, setting Cross-Origin-Resource-Policy can prevent some resources (such as PDFs) from being downloaded in some circumstances. Exercise caution using this header in a production environment.

The HTTP Cross-Origin-Resource-Policy response header conveys a desire that the browser blocks no-cors cross-origin/cross-site requests to the given resource.

Header type Response header
Forbidden header name no


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


The response header below will cause compatible user agents to disallow cross-origin no-cors requests:

Cross-Origin-Resource-Policy: same-origin

For more examples, see


Fetch Standard (Fetch)
# cross-origin-resource-policy-header

Browser compatibility

BCD tables only load in the browser

See also