Spring RestTemplate streaming response into another request

Question

I am trying to stream the result of a file download directly into another post using spring\'s RestTemplate

My current approach is the following:

Answer 1

If you want to forward the response directly without ever holding it in memory, you have to directly write to the response:

@RequestMapping(value = "/yourEndPoint")
public void processRequest(HttpServletResponse response) {
    RestTemplate restTemplate = new RestTemplate();

    response.setStatus(HttpStatus.OK.value());

    restTemplate.execute(
        fileToDownloadUri,
        HttpMethod.GET,
        (ClientHttpRequest requestCallback) -> {},
        responseExtractor -> {
            IOUtils.copy(responseExtractor.getBody(), response.getOutputStream());
            return null;
        });
}