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: *
access-control-expose-headers: content-length
cache-control: public, max-age=2592000
cf-cache-status: EXPIRED
cf-ray: 9abe299a52e010ec-ORD
connection: keep-alive
content-length: 223
content-type: application/xml
date: Wed, 10 Dec 2025 16:36:40 GMT
expires: Fri, 09 Jan 2026 16:36:40 GMT
server: cloudflare
set-cookie: __cf_bm=d7OY9D824sOGV1OQfb.DAolSYXi_RfILqmgIxEH1h2s-1765384600-1.0.1.1-dhz7eTssGqQsI7ve__L79Bz0P9fT5ft6N.RsSJ41_6n0q54SVrzcNKNiV7PMYv3lu0W92u.wgYuZGKYHtG3OS9j12uqE.WsMIMygHDaAaQA; path=/; expires=Wed, 10-Dec-25 17:06:40 GMT; domain=.oaistatic.com; HttpOnly; Secure, _cfuvid=.yDZCYxgTdOER.sB5vea.VvOoQHiSRyuQqgEAkEp6Oo-1765384600764-0.0.1.1-604800000; path=/; domain=.oaistatic.com; HttpOnly; Secure; SameSite=None
strict-transport-security: max-age=31536000; includeSubDomains; preload
timing-allow-origin: https://chatgpt.com
x-content-type-options: nosniff
x-ms-request-id: 35f320e2-b01e-0047-15f3-69596c000000

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