S3 file upload to pre-signed url

s3upload.java

//generate as described in S3 docs
URL url = s3Client.generatePresignedUrl(generatePresignedUrlRequest);

String presignedURL = url.toString();
System.out.println(presignedURL);

//upload gzip resource
Resource resource = new ClassPathResource("file.gz");
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
headers.set("Content-Encoding","gzip");
HttpEntity<byte[]> requestEntity = new HttpEntity<>(StreamUtils.copyToByteArray(resource.getInputStream()), headers);
RestTemplate restTemplate = new RestTemplate();
ResponseEntity<String> response = restTemplate.exchange(new URI(presignedURL), org.springframework.http.HttpMethod.PUT,
        requestEntity, String.class);
System.out.println("response: " + response);

Thank you so much