title: How to do a Pre-signed POST upload to AWS S3 in Go?
body: <p>I would like to do a <a href="http://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-post-example.html" rel="nofollow">pre-signed POST to upload files to an AWS S3 bucket</a> - how would this be done in Go?</p>
  
  <p>Please note that this is not the same as Pre-signed upload with PUT.</p>