If your API is on a different domain, your server must explicitly allow the headers you are sending. Your server’s CORS configuration should include: Access-Control-Allow-Origin: https://your-frontend.com Access-Control-Allow-Headers: Authorization, Custom-Header
Programmatically clicking a hidden link to trigger the browser's download dialog. Step-by-Step Implementation Here is the clean, reusable function to handle this: javascript Use code with caution. Handling Large Files (The Memory Risk) download with header javascript
To logic, the fetch() API is your best friend. By requesting the file as a Blob and using URL.createObjectURL , you can maintain high security with Authorization headers while providing a seamless user experience. If your API is on a different domain,