AWS (Amazon Web Services) S3 Bucket Hosting: Redirecting a folder or subdirectory to a new domain, preserving path

I recently shuffled around some content between web sites I host with AWS S3 and needed to redirect a subdirectory or folder on one domain to the same path on another domain.

Basically, the equivalent of the following with Apache:

Redirect 301 /post

Turns out, this is easily possible with S3 redirection rules (XML) as follows: