How do I pass template context information when using HttpResponseRedirect in Django?

For the sake of completion and future reference, you can now use the messages framework. After you install it:

views.py

from django.contrib import messages

def view(request):
  # your code
  messages.success(request, "Your data has been saved!")
  HttpResponseRedirect(request.path)

template.html

{% if messages %}
<ul class="messages">
  {% for message in messages %}
  <li{% if message.tags %} class="{{ message.tags }}"{% endif %}>{{ message }}</li>
  {% endfor %}
</ul>
{% endif %}