@app.route("/make_recommendation")
def make_reco():
    t0 = time.time()
    scores = base_utils.process_input_items(request.args)
    keys = map(lambda x: ndb.Key(config['recos']['kind'], x),
        scores.keys())
    entities = [e for e in ndb.get_multi(keys) if e]
    if not entities:
        result = {'results': [], 'statistics':
            {'elapsed_time': time.time() - t0}}
        return jsonify(result)
    results = utils.process_recommendations(entities, scores,
        int(request.args.get('n', 10)))
    results['statistics'] = {}
    results['statistics']['elapsed_time'] = time.time() - t0
    return jsonify(results)