CORS Simulator
Preflight
Choose Preset…
Simple Request
Preflight Request
Credentialed
Wildcard Origin
Simulate
📤 Request Configuration
Request Origin
Method
GET
POST
PUT
DELETE
PATCH
OPTIONS
Custom Headers
(one per line: Header: Value)
Include Credentials
📥 Server CORS Config
Access-Control-Allow-Origin
Access-Control-Allow-Methods
Access-Control-Allow-Headers
Access-Control-Max-Age (seconds)
Access-Control-Allow-Credentials
📊 Simulation Results
Configure request & server, then click Simulate
Suggested Server Config
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