I have written a simple code ,but flash is not showing any message .
Code -
Code -
flash('OK. The User ID is x')
return redirect(url_for('about'))about.html-<html>
<head>
<title>Welcome </title>
</head>
<body>
<div class ="container">
{% with messages = get_flashed_messages() %}
{% if messages %}
<ul class =flashes>
{% for message in messages %}
<li>{{ message }}</li>
{% endfor %}
</ul>
{% endif %}
{% endwith %}
</div>
</body>
</html>