I am trying to implement file upload in a Java web application. When the user uploads a file through the UI, I want it to be stored in amazon amazon s3 storage.

Here is my code for the back-end:

@PostMapping("/upload-file")
public String saveFile(@RequestParam("name") String name, @RequestParam("file")MultipartFile file, RedirectAttributes redirectAttributes){

    AWSCredentials credentials = new BasicAWSCredentials("user", "psw");

    AmazonS3 s3Client = new AmazonS3Client(credentials);

    String bucketName = "kfib";

    s3Client.createBucket(bucketName);

    s3Client.setRegion(com.amazonaws.regions.Region.getRegion(Regions.EU_WEST_1));


    ObjectMetadata md = new ObjectMetadata();
    md.setContentType("application/pdf");

// md.set

    try{
        InputStream inputStream = file.getInputStream();

        s3Client.putObject(new PutObjectRequest(bucketName, name, inputStream, md).withCannedAcl(CannedAccessControlList.PublicRead));

        S3Object s3Object = s3Client.getObject(new GetObjectRequest(bucketName, name));

        log.info("Url of the image:\n");
        log.info(s3Object.getObjectContent().getHttpRequest().getURI().toString());

    }catch(IOException e){
        e.printStackTrace();
    }


    log.info("upload called with post method...");

    return "redirect:/admin/posts";
}

I can upload to files if I upload them to the default region. However, I wish to store my files on another server. I have a bucket in an EU region, if I try to upload something there with the above code, I get the following error code:

com.amazonaws.services.s3.model.AmazonS3Exception: The authorization header is malformed; the region 'us-east-1' is wrong; expecting 'eu-central-1' (Service: Amazon S3; Status Code: 400; Error Code: AuthorizationHeaderMalformed; Request ID: 8EF630B5F0224C4F)

It seems this line

s3Client.setRegion(com.amazonaws.regions.Region.getRegion(Regions.EU_WEST_1));

doesn't have any effect. What am I doing wrong?