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GeekFormat

CORS Header Builder

CORS Header Builder

Generate Access-Control-Allow-* headers for common cross-origin scenarios. Detect wildcard and credentials conflicts early.

Generated Result

CORS Checklist

1. If using cookies or Authorization credentials, browsers do not accept * as Allow-Origin.

2. Preflight requests typically also require the server to correctly respond to OPTIONS.

3. Frontend can only see non-simple response headers that are exposed via Access-Control-Expose-Headers.

JSON Preview

{
  "headers": [
    {
      "name": "Access-Control-Allow-Origin",
      "value": "https://app.geekformat.com"
    },
    {
      "name": "Access-Control-Allow-Methods",
      "value": "GET, POST, PATCH, DELETE, OPTIONS"
    },
    {
      "name": "Access-Control-Allow-Headers",
      "value": "Content-Type, Authorization, X-Request-Id"
    },
    {
      "name": "Access-Control-Expose-Headers",
      "value": "ETag, X-Trace-Id"
    },
    {
      "name": "Access-Control-Allow-Credentials",
      "value": "true"
    },
    {
      "name": "Access-Control-Max-Age",
      "value": "600"
    }
  ],
  "warnings": []
}