CORS Tester
Preflight Simulator & Diagnosis
History
Request Configuration
Endpoint URL
Method
GET
POST
PUT
DELETE
PATCH
OPTIONS
Custom Headers
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Test CORS
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Request Flow
Results
Suggested Server Configuration
Express
Nginx
Flask
Copy
Common Scenarios
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REST API (GET)
JSONPlaceholder
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POST with JSON
httpbin.org
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GitHub API
Public user data
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Blocked CORS
No CORS headers
Testing CORSβ¦