Django tip: AttributeError: 'str' object has no attribute 'has_header'

Here's another quick Django tip that I couldn't find an answer for on google:

AttributeError: 'str' object has no attribute 'has_header'

The error is the result of returning a string in a view instead of using HttpResponseRedirect. For example I accidentally wrote:

return urlresolvers.reverse('crowd-detail')

When what I meant was:

return HttpResponseRedirect(urlresolvers.reverse('crowd-detail'))

Hope that helps someone out there.