🔄 CORS Checker

Test Cross-Origin Resource Sharing configuration and debug CORS issues

URL to Test

Test Origin (optional)

💡 About CORS

CORS (Cross-Origin Resource Sharing) is a security mechanism that allows web pages to make requests to a different domain than the one that served the page. It's implemented via HTTP headers that indicate which origins are permitted to read the response.

Key CORS Headers:
Access-Control-Allow-Origin: Specifies which origins can access the resource
Access-Control-Allow-Methods: Allowed HTTP methods (GET, POST, etc.)
Access-Control-Allow-Headers: Allowed request headers
Access-Control-Allow-Credentials: Whether credentials can be included

Common CORS Errors: "No 'Access-Control-Allow-Origin' header present" - This means the server hasn't enabled CORS for your origin.