Flexible www. and non-www for .txt and images

This has been difficult to pinpoint but then I also tested on this site and it seems to be doing the same.
Code:

https://xenforo.com/robots.txt
https://www.xenforo.com/robots.txt

https://xenforo.com/community/styles/default/xenforo/xenforo-logo.svg
https://www.xenforo.com/community/styles/default/xenforo/xenforo-logo.svg

https://xenforo.com/community/data/avatars/o/11/11388.jpg?1701366656
https://www.xenforo.com/community/data/avatars/o/11/11388.jpg?1701366656

It doesn't seem to redirect...

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