POST /v1/databases/{databaseId}/collections/{collectionId}/attributes/url HTTP/1.1
Host: <REGION>.cloud.appwrite.io
Content-Type: application/json
X-Appwrite-Response-Format: 1.6.0
X-Appwrite-Project: <YOUR_PROJECT_ID>
X-Appwrite-Key: <YOUR_API_KEY>

{
  "key": ,
  "required": false,
  "default": "https://example.com",
  "array": false
}