403 forbidden error Django restful request.

Add the below statement on top of each and every view function definition (views.py).

@api_view(["POST", "GET"])

eg:

@api_view(["POST", "GET"])
def GivenInput():
   return Response(e.args[0],status.HTTP_400_BAD_REQUEST)

Note*: I don't know any alternative way to make it global throughout the file.