Blog
Cross-Origin-Resource-Policy and COEP: orthogonal controls that interact with CORS visibility
CORP can block cross-origin embedding even when CORS allows fetch; COEP tightens isolation for Spectre mitigations.
1 min read
corpcoepsecurity
Asset pipelines
Images and fonts loaded cross-origin may need CORP cross-origin on CDNs used by multiple sites.
WASM modules may require COOP/COEP for shared memory—test SharedArrayBuffer gates.
Debugging
DevTools shows blocked-by-CORP separately from CORS errors—read the exact reason string.
Feature policy deprecations rename to Permissions-Policy—update monitoring dashboards accordingly.