This demonstrates that Fetch does not need to set the credentials property in order to send Authorization headers.

You'll find two folders. Please run the servers for both folders at the same time with npm run server.

Next, please navigate to http://localhost:4000. This will show you the frontend of the frontend folder.

You'll find two buttons:

1. One to send a Fetch request to the Host's server at http://localhost:3000
2. The second will send to it's own servers at http://localhost:4000.

Both servers will log the authorization header when you press the corresponding buttons.

Note that credentials are set to omit deliberately to demonstrate the fact that the credentials options is not required for Fetch to send authorization headres.

Also please note that Access-Control-Allow-Credentials is not required on the external server for Fetch to Authorization headers across. It needs Access-Control-Allow-Headers instead.