Great! I love it that you did a episode on something that is so commonly used and we apply it in practice easily as and when needed.
For some reason Cloudfront sends files with "text/html" where as the origin server is sending it correctly.
I am getting a warning from chrome
Resource interpreted as Stylesheet but transferred with MIME type text/html, and browser has to do a 301 redirect to fetch the resource again.
The CDN should not cache a 404 response if cache control headers are set correctly right?