code: protected ByteArrayHttpMessageConverter getByteArrayMessageConverter() {
  		ByteArrayHttpMessageConverter converter = new ByteArrayHttpMessageConverter();
  		converter.setSupportedMediaTypes(Arrays.asList(MediaType.IMAGE_JPEG, MediaType.IMAGE_GIF, MediaType.IMAGE_PNG));
  		return converter;
  	}
docs: Returns a {@link ByteArrayHttpMessageConverter} to be used by the internal {@link RestTemplate} when consuming image or other binary resources.
  By default, the message converter supports "image/jpeg", "image/gif", and "image/png" media types.
  Override to customize the message converter (for example, to set supported media types).
  To remove/replace this or any of the other message converters that are registered by default, override the getMessageConverters() method instead.
  @return a {@link ByteArrayHttpMessageConverter} to be used by the internal {@link RestTemplate} when consuming image or other binary resources.