Java S3 getObjectContent

Question

I am trying to use this example from the AWS documentation to get a file from S3.

The file I am trying to read from S3 is a binary file. I need the InputStream from s3object.getObjectContent() to work with it in another framework. If I am trying to save the S3ObjectInputStream I receive the following error:

WARNING: Not all bytes were read from the S3ObjectInputStream, aborting HTTP connection. This is likely an error and may result in sub-optimal behavior. Request only the bytes you need via a ranged GET or drain the input stream after use.

My code is actually pretty easy:

public String handleRequest(S3Event event, Context context) {
    context.getLogger().log("Received event: " + event.toJson());

    // Get the object from the evØent and show its content type
    String bucket = event.getRecords().get(0).getS3().getBucket().getName();
    String key = event.getRecords().get(0).getS3().getObject().getKey();

    try (S3Object response = s3.getObject(new GetObjectRequest(bucket, key))) {
        Long filesize = response.getObjectMetadata().getContentLength();
        System.out.println("File size is: " + filesize);
        S3ObjectInputStream s3is = response.getObjectContent();

        MsgParser msgp = new MsgParser();
        Message msg = msgp.parseMsg(s3is);
        String fromEmail = msg.getFromEmail();
        String fromName = msg.getFromName();
        String subject = msg.getSubject();

    } catch (Exception e) {
        System.out.println("Unable to get file from S3 with reason: " + e);
    }

    return "";
}

What is my error here?