@app.server.route('/_logout', methods=['POST'])
def on_logout():
    rep = flask.redirect('/logged-out')
    rep.set_cookie('logout-cookie', '', 0)
    return rep
@app.server.route('/_logout', methods=['POST'])
def on_logout():
    rep = flask.redirect('/logged-out')
    rep.set_cookie('logout-cookie', , 0)
    return rep