Django + Nginx + X-Accel-Redirect

How do I access protected directories using Django? I have the following configuration but is not working, there is always page 404 when I try to access the directory.

Django:

def test(request):
    file_url = 'http://mysite.com/media/users/avatar.png'
    response = HttpResponse()
    response['X-Accel-Redirect'] = file_url
    return response

Nginx:

server {
    listen 80;
    server_name mysite.com;

    location /media/ {
        internal;
        alias /home/ubuntu/webapps/myapp/media/;
    }
}

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