code: def _reverse(viewname, args=None, kwargs=None, request=None, format=None, **extra):
      
      if format is not None:
          kwargs = kwargs or {}
          kwargs['format'] = format
      url = django_reverse(viewname, args=args, kwargs=kwargs, **extra)
      if request:
          return request.build_absolute_uri(url)
      return url
docs: Same as `django.core.urlresolvers.reverse`, but optionally takes a request
      and returns a fully qualified URL, using the request to get the base URL.