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 not work correctly with CORS.

What's wrong?

It does not have the access-control-allow-origin header set to *. Without this header, requests from other domains cannot be made to it via a users browser.

How to fix it?

If you have access to the server for the URL, you'll need to modify it to add the access-control-allow-origin header. If you do not have access, you'll need to upload the file somewhere else.

Headers

These are the response headers received when making the request.

cache-control: public, no-cache
cf-cache-status: DYNAMIC
cf-ray: 93d0b5d2f755dd00-ORD
connection: keep-alive
content-type: text/html; charset=UTF-8
date: Fri, 09 May 2025 11:03:26 GMT
last-modified: Fri, 09 May 2025 10:51:13 GMT
pre-cognitive-push: Enabled
quantum-flux-capacity: Omega
referrer-policy: strict-origin-when-cross-origin
server: cloudflare
strict-transport-security: max-age=31536000
transfer-encoding: chunked
vary: Accept-Encoding
x-content-type-options: nosniff
x-frame-options: SAMEORIGIN
x-xss-protection: 1; mode=block

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