CORS Tester
Test CORS headers on any URL from your browser — send a real request, inspect the response headers, and see whether cross-origin reads are allowed, blocked or preflighted.
Requests are sent from origin
https://example.com by your browser — results apply to that origin, not to cURL or server-side calls. try:
About CORS Tester
Send a real fetch() request to any URL and see exactly what the browser can read: status code, response headers, body preview and every access-control-* header, with a verdict on whether your origin is allowed.
Custom methods and headers trigger a CORS preflight — the tool tells you when that happens and runs an OPTIONS probe to reveal the server's declared policy. Everything runs in your browser; no request passes through our servers.