Getting S3 CORS Access-Control-Allow-Origin to dynamically echo requesting domain

Question

How can I set the S3 CORS AllowedOrigin configuration such that it dynamically echos the requesting domain in the Access-Control-Allow-Origin heade

Answer 1

AWS's CORS documentation does not document this, but I managed to get the answer in a thread on AWS Developer Forums, where I found that AWS changed the original behavior of echoing the requesting domain if * is being used for AllowedOrigin.

To get S3 to dynamically echo the requesting domain, AllowedOrigin has to be set as such:

http://*
https://*