<form action="/save" method="POST">
Value: <input name="value">
<input type="submit" value="Send">
</form>

<form action="/get" method="POST">
<input type="submit" value="Get">
</form>

{% if saved %}
<b>saved</b>
{{ value }}
{% endif %}

{% if value %}
  The value is <b>{{ value }}</b>
{% endif %}

