## Put Bucket CORS Policy

**put** `/accounts/{account_id}/r2/buckets/{bucket_name}/cors`

Set the CORS policy for a bucket.

### Path Parameters

- `account_id: string`

  Account ID.

- `bucket_name: string`

  Name of the bucket.

### Header Parameters

- `"cf-r2-jurisdiction": optional "default" or "eu" or "fedramp"`

  Jurisdiction where objects in this bucket are guaranteed to be stored.

  - `"default"`

  - `"eu"`

  - `"fedramp"`

### Body Parameters

- `rules: optional array of object { allowed, id, exposeHeaders, maxAgeSeconds }`

  - `allowed: object { methods, origins, headers }`

    Object specifying allowed origins, methods and headers for this CORS rule.

    - `methods: array of "GET" or "PUT" or "POST" or 2 more`

      Specifies the value for the Access-Control-Allow-Methods header R2 sets when requesting objects in a bucket from a browser.

      - `"GET"`

      - `"PUT"`

      - `"POST"`

      - `"DELETE"`

      - `"HEAD"`

    - `origins: array of string`

      Specifies the value for the Access-Control-Allow-Origin header R2 sets when requesting objects in a bucket from a browser.

    - `headers: optional array of string`

      Specifies the value for the Access-Control-Allow-Headers header R2 sets when requesting objects in this bucket from a browser. Cross-origin requests that include custom headers (e.g. x-user-id) should specify these headers as AllowedHeaders.

  - `id: optional string`

    Identifier for this rule.

  - `exposeHeaders: optional array of string`

    Specifies the headers that can be exposed back, and accessed by, the JavaScript making the cross-origin request. If you need to access headers beyond the safelisted response headers, such as Content-Encoding or cf-cache-status, you must specify it here.

  - `maxAgeSeconds: optional number`

    Specifies the amount of time (in seconds) browsers are allowed to cache CORS preflight responses. Browsers may limit this to 2 hours or less, even if the maximum value (86400) is specified.

### Returns

- `errors: array of ResponseInfo`

  - `code: number`

  - `message: string`

  - `documentation_url: optional string`

  - `source: optional object { pointer }`

    - `pointer: optional string`

- `messages: array of string`

- `result: unknown`

- `success: true`

  Whether the API call was successful.

  - `true`

### Example

```http
curl https://api.cloudflare.com/client/v4/accounts/$ACCOUNT_ID/r2/buckets/$BUCKET_NAME/cors \
    -X PUT \
    -H 'Content-Type: application/json' \
    -H "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
    -d '{}'
```

#### Response

```json
{
  "errors": [
    {
      "code": 1000,
      "message": "message",
      "documentation_url": "documentation_url",
      "source": {
        "pointer": "pointer"
      }
    }
  ],
  "messages": [
    "string"
  ],
  "result": {},
  "success": true
}
```