CORS Checker
Cross-Origin Resource Sharing (CORS) is a security feature that restricts how websites can make requests to domains different from the one serving the web page. This free online CORS checker helps you test and analyze CORS configuration by sending requests to a URL and examining the response headers. Simply enter a URL and see if CORS is properly configured, what headers are returned, and get recommendations for fixing any issues.
Ready
How this tool works:
- Click "Send Test" to make a GET request and examine response headers
- Click "Preflight" to send an OPTIONS request and check CORS preflight handling
- Headers starting with
Access-Control-indicate CORS configuration - If CORS is properly configured,
Access-Control-Allow-Originwill be present
Features
Globe
Header Analysis
Examine all CORS-related response headers returned by the server.
Shield
CORS Status
Quickly see if CORS is enabled, disabled, or partially configured.
AlertCircle
Preflight Test
Send a preflight OPTIONS request to check CORS preflight handling.
Frequently Asked Questions
Tags
cors
cross-origin
security
preflight
headers