Use of nginx as proxy for serving S3 media

[bodgerbarnett]

Would I be right in saying that the guide in this repo for proxying with nginx will only work with locally served media?
I assume that's the case, as the /path/to/media must be a local path, not an S3 one.

Do you know how to use nginx as the proxy when using S3 media? I guess I'll need some different config in the nginx location block but I'm not 100% sure what, exactly.