Hi @ThomasH,
Both the request and response content types are validated. You can set the request body’s content type in the headers. So, I suppose it’s the content type of the response.
These are the supported content types:
- ‘application/json’
- ‘application/xml’
- ‘text/html’
- ‘text/xml’
- ‘application/jsonp’
- ‘text/plain’
- ‘application/javascript’
- ‘application/vnd.api+json’
The content type mentioned before the comma (;) is only compared here, and the space after is not important.
Could you check the FDK debug logs while facing the issue to see the response content type you get? When you face this error, you will see what content type it gets and compare it with this list.
Also, as another step, could you publish this app anyway as a custom app and test once if it works in the cloud environment?