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: *
alt-svc: h3=":443"; ma=86400
cf-cache-status: DYNAMIC
cf-ray: 9e694c7fbc84fad4-CMH
content-type: text/html, application/json
date: Fri, 03 Apr 2026 16:02:39 GMT
server: cloudflare
strict-transport-security: max-age=31536000; includeSubDomains; preload
transfer-encoding: chunked
vary: Accept-Encoding

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