docs: def make_response(self, image, size, mode, filename=None, *args, **kwargs):
          """
          :param image: image as bytes
          :param size: requested maximum width/height size
          :param mode: one of 'scale', 'fit' or 'crop'
          :param filename: filename
          """
          try:
              fmt = get_format(image)
          except IOError:
              # not a known image file
              raise NotFound()
  
          self.content_type = "image/png" if fmt == "PNG" else "image/jpeg"
          ext = "." + str(fmt.lower())
  
          if not filename:
              filename = "image"
          if not filename.lower().endswith(ext):
              filename += ext
          self.filename = filename
  
          if size:
              image = resize(image, size, size, mode=mode)
              if mode == CROP:
                  assert get_size(image) == (size, size)
          else:
              image = image.read()
  
          return make_response(image)