HipTest API headers authenticaton should not use custom headers


I have recently run into authenticaton problem using HipTest API that has no workaround at the moment (AFAIK).
Referring to Hiptest API Doc every request must include the following header: Accept: application/vnd.api+json; version=1.
My problem is in regards with the ; version=1 part which is not correctly parsed (encoded, decoded) in requests generated by software I use (I work as a QA and it is a software I am currently testing).
It is the response I get each time I try to request HipTest API (request is correct, it works in Postman). As you can see, version is parsed as another header key and because it is invalid, the request is not authenticated correctly.

I would like to ask if there is a way you can change the auth headers so that multipart headers are not necessary? It creates issues like the one I have just described.

Best Regards,