title: S3 pre-signed url - check if url was used?
body: <p>I'm using S3 pre-signed url for uploading images directly from client-side.
  I would like to be able to push a message to SQS queue only when I'm sure that the url was used and a new image was uploaded.</p>
  
  <p>Given a pre-signed url, how can I validate if it was used?</p>