Deepl translator API connection. Error: TypeError: Failed to fetch. Does the server allow CORS?status: undefined

I figured out I need to use CORS proxy. Now I'm trying to find out how looking inspiration over here https://nordicapis.com/10-free-to-use-cors-proxies/

Team

I’m trying to deploy automatic translations.
With the first step, I’m defining deeplML API data source.
And this kills me as I get the results below.
At the same time when testing URL with other tools or even web-browser all seems to work fine.
I’m confused and guess missing some small tick to get it to fly.
Double eyes or hammer needed.
thanks!

So when I test the URL invocation I get it right.

Then I define the data source

Then I test with GET method with the following error

the js console/network shows:

Anyone?
regards
Tom

ps I guess the answer might be hidden somewhere below but I’m struggling to pull conclusions …

Forget about that thread of Google App Script. That was a bunch of months ago and I should and will delete that. I’ll look into Your issue later.
(Though do not expect much as I am no staff :pray:t2:)