docs: def set_meta(request):
      """
      This context processor returns meta informations contained in cached files. 
      If there aren't cache it calculates dictionary to return
      """
      context_extras = {}
      if not request.is_ajax() and hasattr(request, 'upy_context') and request.upy_context['PAGE']:
          context_extras['PAGE'] = request.upy_context['PAGE']
          context_extras['NODE'] = request.upy_context['NODE']
      return context_extras