Datasource plugin routes not working

Hi,

I’m developing a datasource for PRTG-monitoringdata HTTP-API. I read the docs on authentication with plugin routes and wanted to test the " Simple plugin route example" with an dummy-API (https://jsonplaceholder.typicode.com/todos/1).
The responsedata gives an 200 OK but i dont get the API-data in response.
I really don’t know what i’m doing wrong here.

Thanks

pluginjson