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POOccasionally, Django messages are repeated across requests (i.e., they are not cleared)
 

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  1. POOccasionally, Django messages are repeated across requests (i.e., they are not cleared)
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    <p>Very rarely, a <a href="https://www.djangoproject.com/">Django</a> message is rendered in an <code>HTML</code> response. Then, the user <code>GET</code>s another page, and the Django message is rendered again. Sometimes, the user will <code>GET</code> another page thereafter, and the same message will display once again.</p> <p>This happens very rarely, but when it does, most users see the same behavior for a few moments. (It happened once in a group cross-browser test, and everyone in the room saw the same behavior on each of their computers for about five minutes before going away.)</p> <p>This behavior has occurred with many different views; and besides, each view adds them in the same way (see below).</p> <p>I've been unable to reliably reproduce the error, either in our deployed environment (running <code>wsgi.py</code>) or when running the project on a local environment (running <code>manage.py</code>). (I will note that I've never seen this problem locally.)</p> <p>Does anyone have any idea why this might be happening?</p> <p><em>Example of a success message being added.</em></p> <pre><code> messages.success( request, "Changes to {form} {request} were successfully saved."\ .format(form=self.form.display_name, request=serv_request_id_as_url(self.serv_request)) ) </code></pre> <p><em>This is the template code which renders the message:</em></p> <pre><code>&lt;div id="messages"&gt; {% for message in messages %} &lt;div class="alert alert-{{ message.tags }}"&gt; &lt;a class="close" data-dismiss="alert" href="#" title="Close"&gt;&lt;span class="accessibility"&gt;Close this message.&lt;/span&gt;&amp;times;&lt;/a&gt; &lt;strong&gt;{{ message.message|safe }}&lt;/strong&gt; &lt;/div&gt; {% endfor %} &lt;/div&gt; </code></pre> <p><em>Relevant settings:</em></p> <pre><code>MIDDLEWARE_CLASSES = ( 'django.middleware.gzip.GZipMiddleware', 'django.middleware.common.CommonMiddleware', 'outage.middleware.OutageMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.middleware.transaction.TransactionMiddleware', 'django.middleware.csrf.CsrfViewMiddleware', 'django.middleware.clickjacking.XFrameOptionsMiddleware', 'utdirect.middleware.HttpHeaderMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.contrib.messages.middleware.MessageMiddleware', ... ) MESSAGE_STORAGE = 'django.contrib.messages.storage.session.SessionStorage' DATABASES = {'default': {'ENGINE': 'django.db.backends.oracle', ...}} </code></pre>
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    1. USAdam Easterling
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    2. VO
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    1. COCan you specify what the message is?
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      1. USJoe
    2. COJust a guess, but if it's only happens in deployed environment it might have something to do with caching or similar... When the problem occurs the server might have spawned new processes that affects the cache, just a thought...
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      1. POOccasionally, Django messages are repeated across requests (i.e., they are not cleared)
      1. USDaniel Backman
    3. COPlease make sure the session read is not cached and that session write actually succeeds. Django will silently ignore sessions that contain unserializable objects for example which could cause the messages to not be removed properly.
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      1. USpatrys
 

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