Delivery API doesn't require authentication by default. This means your assets and published content items are publicly available. If you enable secure access for Delivery API or want to preview content using Delivery Preview API, you need to authenticate your requests with a valid Delivery API key. You can also secure access to your assets.To authenticate your Delivery API requests, send your requests over HTTPS and use the Authorization header in the following format: Authorization: Bearer <YOUR_API_KEY>. To create and manage your API keys, go to Kontent.ai > Project settings > API keys. Requests with an incorrect or missing Authorization header will fail with an