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: *
cache-control: public, max-age=0, must-revalidate
cf-cache-status: DYNAMIC
cf-ray: 92b1b384e472e114-ORD
connection: keep-alive
content-type: text/html; charset=utf-8
date: Fri, 04 Apr 2025 15:04:58 GMT
nel: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
referrer-policy: strict-origin-when-cross-origin
report-to: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v4?s=ODDyrSV4YaO5xUy5fOUN%2BE3ZbJzGiROmyG11h%2BOUUdmqfZX2vCjiyRlTgROQOG4V%2FVP%2BAn1KajAJ%2FnTfpFnyd7bIMfVKH9OsK%2Bv%2BTRdOl3xWDi0ZODmq%2FsJlybpzHlKNcl8hlyff%2BRZQ4g%3D%3D"}],"group":"cf-nel","max_age":604800}
server: cloudflare
transfer-encoding: chunked
vary: Accept-Encoding
x-content-type-options: nosniff

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