stream multiple files via REST

gistfile1.txt

-------
server:
-------
@Controller
@Slf4j
public class FileController {

    @GetMapping(value = "/files")
    public void getFiles(HttpServletResponse response){

            List<String> fileNames = Arrays.asList("file1.csv","file2.csv");
            response.addHeader("FileNames", "file1.csv;file2.csv");
            fileNames.forEach( fileName -> {
                try {
                    InputStream inputstream = new FileInputStream(fileName);
                    IOUtils.copy(inputstream, response.getOutputStream());
                    inputstream.close();
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            });
    }
}
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-------
client:
-------
public class FileStreamingService {

    public void getFiles(){
        String url = "http://localhost:" + "7000" + "/files";
        RestTemplate restTemplate = new RestTemplate();
        SimpleClientHttpRequestFactory requestFactory = new SimpleClientHttpRequestFactory();
        requestFactory.setBufferRequestBody(false);
        restTemplate.setRequestFactory(requestFactory);
        restTemplate.execute(url, HttpMethod.GET, null, clientHttpResponse -> {
            String fileNamesCombined = clientHttpResponse.getHeaders().getFirst("FileNames");
            List<String> FileNames = new ArrayList<>(Arrays.asList(fileNamesCombined.split(";")));
            List<File> files = new ArrayList<>();
            FileNames.forEach( fileName -> files.add(new File(fileName)));

            files.forEach(file ->{
                try {
                    FileOutputStream outputStream = new FileOutputStream(file);
                    InputStream inputStream = clientHttpResponse.getBody();
                    int byteCount = 0;
                    byte[] buffer = new byte[4096];
                    int bytesRead;
                    int bytesAllowed = 892/2; // CHANGE THIS ACCORDING TO YOUR NEEDS
                    while(bytesAllowed > 0 && inputStream.available() > 0){
                        bytesRead = inputStream.read(buffer,0,bytesAllowed);
                        outputStream.write(buffer, 0, bytesRead);
                        bytesAllowed = bytesAllowed - bytesRead;
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            });
            return "";
        });
    }

}