Directly exposing a file URL isn't always ideal. You might use a proxy to:
Spring Boot makes it surprisingly easy to build a proxy for downloading files from external servers. Whether you need to hide a private URL, add custom authentication, or scan files for viruses before they reach the user, a proxy is the perfect solution. spring boot proxy file download
@Service public class FileProxyService { @Autowired private RestTemplate restTemplate; public void proxyFile(String fileUrl, HttpServletResponse response) { restTemplate.execute(fileUrl, HttpMethod.GET, null, remoteResponse -> { // Copy headers from the remote source response.setContentType(remoteResponse.getHeaders().getContentType().toString()); response.setHeader("Content-Disposition", remoteResponse.getHeaders().getFirst("Content-Disposition")); // Stream the data StreamUtils.copy(remoteResponse.getBody(), response.getOutputStream()); return null; }); } } Use code with caution. 3. Build the Controller The controller exposes the endpoint to your users. Directly exposing a file URL isn't always ideal
You need a RestTemplate that doesn't try to buffer the entire response in memory. You need a RestTemplate that doesn't try to