title: Django amazon s3 SuspiciousOperation
body: <p>So when i try accessing a certain image on S3 from my browser everything works fine. But when python is doing it i get a <code>SuspiciousOperation</code> error. 
  My static folder is public on S3 so i really have no idea where this is coming from.</p>
  
  <pre><code>Publication.objects.get(id=4039).cover.url
  Traceback (most recent call last):
    File "&lt;console&gt;", line 1, in &lt;module&gt;
    File "/home/vagrant/.pyenv/versions/blook/lib/python2.7/site-packages/django/db/models/fields/files.py", line 64, in _get_url
      return self.storage.url(self.name)
    File "/home/vagrant/.pyenv/versions/blook/lib/python2.7/site-packages/queued_storage/backends.py", line 291, in url
      return self.get_storage(name).url(name)
    File "/home/vagrant/.pyenv/versions/blook/lib/python2.7/site-packages/queued_storage/backends.py", line 115, in get_storage
      elif cache_result is None and self.remote.exists(name):
    File "/home/vagrant/.pyenv/versions/blook/lib/python2.7/site-packages/storages/backends/s3boto.py", line 410, in exists
      name = self._normalize_name(self._clean_name(name))
    File "/home/vagrant/.pyenv/versions/blook/lib/python2.7/site-packages/storages/backends/s3boto.py", line 341, in _normalize_name
      name)
  SuspiciousOperation: Attempted access to 'http:/s3-eu-west-1.amazonaws.com/xpto/static/images/default-image.png' denied.
  </code></pre>
  
  <p>My settings:</p>
  
  <pre><code>AWS_S3_SECURE_URLS = True  # use http instead of https
  S3_URL = 'http://s3-eu-west-1.amazonaws.com/%s' % AWS_STORAGE_BUCKET_NAME
  MEDIA_ROOT = 'media/'
  STATIC_ROOT = '/static/'
  STATIC_URL = S3_URL + STATIC_ROOT
  MEDIA_URL = S3_URL + '/' + MEDIA_ROOT
  </code></pre>
  
  <p>For now i can work around it, but that is not a long term solution. any ideas?</p>