appengine/flexible/logging/index.html.twig

<form action="/log" method="POST">
    <input type="text" name="text" value="Text To Be Logged!" />
    <input type="submit" value="Log It" />
</form>

<h2>Logs:</h2>

<ul>
{% for log in logs %}
    <li>
        <strong>{{ log.info.timestamp|split('.')[0]|date('M jS, H:i')}}</strong>:
        {{ log.info.jsonPayload.message }}
    </li>
{% else %}
    <li>No Logs!</li>
{% endfor %}
</ul>