API & Network
CORS Debugger
Simulate origin, method and header compatibility.
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Output
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Your result will appear here
Add an input and run the tool to get started.How to use CORS Debugger
Paste your input or load the example, choose the relevant options, then select Run tool. Errors appear below the editors. Copy or download the result when ready.
Simulation only. Browsers enforce CORS; this tool cannot bypass it. Non-simple requests require an OPTIONS preflight.
Keyboard shortcuts: Ctrl/⌘ + Enter to run, Ctrl/⌘ + K to find another tool.