CORS Test
Cross-Origin Resource Sharing configuration checker
CORS Test Tool Usage Guide
Main Features
- Preflight Detection - Send OPTIONS request to test preflight
- Header Parsing - Parse all Access-Control-* headers
- Issue Diagnosis - Automatically detect CORS configuration issues
- Fix Suggestions - Provide server-side configuration modification suggestions
What is CORS
- CORS is the browser's cross-origin security policy mechanism
- Cross-origin requests require servers to set correct response headers
- Complex requests send a preflight OPTIONS request first
- Credential requests require explicit Allow-Credentials