Referrer Policystrict-origin-when-cross-origin

Hi
I am trying to do my first API customization.
i.e. accessing a server on the internet from a script on my erpnext-system.

The browser console reports this…

(Reason: CORS header ‘Access-Control-Allow-Origin’ missing)

And the Network tab reports this…

Status
200
OK
VersionHTTP/1.1
Transferred1.16 kB (1.03 kB size)
Referrer Policystrict-origin-when-cross-origin
Request PriorityHighest
DNS ResolutionSystem

I am using Firefox and I have already ( tried to ) disable CORS via a setting in

about:config

And yes when I use the same URL and KEY with POSTMAN, I get a properly formatted response, so those items must be correct.

The response headers when I do my script-request is the same as the response headers that I see in POSTMAN. So the response from the server in both cases are the same.

Do I need to disable CORS in my code when setting up the FETCH data ?