CORS Policy Simulator

Check whether a browser will allow a cross-origin request and which response headers it needs.

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Check whether a browser will allow a cross-origin request and which response headers it needs.

Models the policy in this browser. It does not send the request.

Request model

Response CORS headers

Allow-Methods and Allow-Headers are checked only when the browser requires preflight.

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Models the policy in this browser. It does not send the request.

Request model

Response CORS headers

Allow-Methods and Allow-Headers are checked only when the browser requires preflight.