Analyze Cross-Origin Resource Sharing (CORS) configuration and security for any URL
Provide the URL you want to check. It can be an API endpoint or any web resource.
Our tool sends preflight requests and analyzes all CORS headers and configurations.
Review detailed CORS configuration, security score, and recommendations for improvements.
Checks all CORS headers including origins, methods, headers, and credentials configuration.
Get a security grade (A+ to F) based on CORS configuration and industry best practices.
Receive specific recommendations to fix issues and improve your CORS security configuration.
CORS (Cross-Origin Resource Sharing) is a security mechanism that controls which websites can access your API or resources. Proper CORS configuration prevents unauthorized access while allowing legitimate cross-origin requests.
The wildcard (*) means any website can access your resources. This is generally insecure for APIs handling sensitive data. It's better to specify exact allowed origins.
The score is based on CORS header configuration, allowed origins specificity, credential handling, and security best practices. A higher score indicates better security configuration.
A preflight request is an OPTIONS request sent by browsers before certain cross-origin requests to check if the actual request is safe to send. It checks CORS headers and permissions.
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