CORS Tester

Use this little website to test if a URL is setup correctly to work with CORS.




If your CORS setup is not using a wildcard then this should be a domain that matches your AllowedOrigins


Shareable link:

Results

This URL will work correctly with CORS.

Headers

These are the response headers received when making the request.

access-control-allow-origin: *
cf-cache-status: DYNAMIC
cf-ray: 9957a41177fea1e6-YYZ
connection: keep-alive
content-security-policy: default-src 'none'
content-type: text/html; charset=utf-8
date: Tue, 28 Oct 2025 04:20:29 GMT
server: cloudflare
transfer-encoding: chunked
x-content-type-options: nosniff
x-powered-by: Express

CORS tester was built by @mscccc. The code is available on GitHub. Sponsored by HTML/CSS to Image.