code: def get_master_url(request, image_id):
      '''
      get image's master url
  
      ...
  
      :param request: http GET request /renderer/master/url/<image_id>/
      :param image_id: the master image primary key
      :return: master url in a json dictionary
      '''
      im = get_object_or_404(MasterImage, pk=image_id)
  
      return JsonResponse({'url': im.get_master_url()}f get_master_url(request, image_id):
      '''
      get image's master url
  
      ...
  
      :param request: http GET request /renderer/master/url/<image_id>/
      :param image_id: the master image primary key
      :return: master url in a json dictionary
      '''
      im = get_object_or_404(MasterImage, pk=image_id)
  
      return JsonResponse({'url': im.get_master_url()})
docs: get image's master url
  
      ...
  
      :param request: http GET request /renderer/master/url/<image_id>/
      :param image_id: the master image primary key
      :return: master url in a json dictionary