Flask, one flash message not getting displayed

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Flask flash message no longer works when using ajax 2 answers

How to manage a redirect request after a jQuery Ajax call 30 answers

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I think (but I'm not sure, because you didn't include the code of index ), that the template in index doesn't include the flash. You need to format the index page (or the base template) to display the flash.

Check the examples in: http://flask.pocoo.org/docs/0.12/patterns/flashing/, practically:

{% with messages = get_flashed_messages() %}
  {% if messages %}
    <ul class=flashes>
    {% for message in messages %}
      <li>{{ message }}</li>
    {% endfor %}
    </ul>
  {% endif %}
{% endwith %}

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