text: from django import http
  from django.conf import settings
  
  
  class XViewMiddleware(object):
      """
      Adds an X-View header to internal HEAD requests -- used by the documentation system.
      """
      def process_view(self, request, view_func, view_args, view_kwargs):
          """
          If the request method is HEAD and either the IP is internal or the
          user is a logged-in staff member, quickly return with an x-header
          indicating the view function.  This is used by the documentation module
          to lookup the view function for an arbitrary page.
          """
          assert hasattr(request, 'user'), (
              "The XView middleware requires authentication middleware to be "
              "installed. Edit your MIDDLEWARE_CLASSES setting to insert "
              "'django.contrib.auth.middleware.AuthenticationMiddleware'.")
          if request.method == 'HEAD' and (request.META.get('REMOTE_ADDR') in settings.INTERNAL_IPS or
                                           (request.user.is_active and request.user.is_staff)):
              response = http.HttpResponse()
              response['X-View'] = "%s.%s" % (view_func.__module__, view_func.__name__)
              return response
  