code: async def disengage_axes(request):
      
      hw = hw_from_req(request)
      data = await request.text()
      axes = json.loads(data).get('axes')
      invalid_axes = [ax for ax in axes if ax.lower() not in 'xyzabc']
      if invalid_axes:
          message = "Invalid axes: {}".format(', '.join(invalid_axes))
          status = 400
      else:
          await hw.disengage_axes([ax.upper() for ax in axes])
          message = "Disengaged axes: {}".format(', '.join(axes))
          status = 200
      return web.json_response({"message": message}, status=status)
docs: Disengage axes (turn off power) primarily in order to reduce heat
      consumption.
      :param request: Must contain an "axes" field with a list of axes
          to disengage (["x", "y", "z", "a", "b", "c"])
      :return: message and status code