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-headers: *
access-control-allow-methods: *
access-control-allow-origin: *
alt-svc: h3=":443"; ma=2592000
cf-cache-status: DYNAMIC
cf-ray: 9affb9b9d2cf1cd6-ORD
connection: keep-alive
content-type: text/html; charset=utf-8
date: Thu, 18 Dec 2025 15:34:38 GMT
last-modified: Wed, 04 Jun 2025 13:05:30 GMT
server: cloudflare
transfer-encoding: chunked
vary: Accept-Encoding

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