Flask serve Angular 2+ App

flask_app.py

@bp.route('/<path:path>')
def catch_all(path):
    print('You want path: %s' % path)
    return index_app()

 
def index_app():
    cur_path = ''
    f = open(cur_path + "static/apps/todo/index.html", "r")
    file_text = f.read()
    f.close()

    html = render_template_string(file_text)
    return html