def METHOD_NAME():
    """
    Retrieve the available phases in the diffractometer.
        :response Content-type: application/json,
            example: {'phase_list': [Centring, BeamLocation, DataCollection,
                                    Transfer]}
        :statuscode: 200: no error
        :statuscode: 409: error
    """
    resp = jsonify({"current_phase": HWR.beamline.diffractometer.METHOD_NAME()})
    resp.status_code = 200
    return resp