Redirect page but keeping it accessible

Hi guys,

I don’t really know how to ask this so long story short I have this URL:

  • website/assets/file.xml

I need to create a redirection from it but keep it alive meaning:

  • website/assets/file.xml

  • website/file.xml

Both URLs should be accessible and the redirection should not change the header.
I hope this question makes sense to someone. I have no idea where to start with since I cannot use the normal redirection because it changes the header and also the old link will no longer work.

Thanks guys