Global AI and Data Science

Hi, I am currently attempting to send a package and then go into uploading and downloading using the AoC, Node and Transfer SDK APIs. However at the moment I have created the bearer token and run the POST requests but am only getting an HTML response when I need a JSON response. I was wondering if anyone could help? I have tried a variety of things but don't know where the source of the problem is. Any information would be a great help. Thanks! Kam