Where does the redirect from shortlink to permalink happen?

That’s handled by the redirect_canonical function, set up as a default template_redirect filter.

So it can be customized either by :

  • a template_redirect filter, with a priority value lower than 10, so it runs before the redirect_canonical function (which will eventually skip the next filters by making a redirect).
  • a redirect_canonical filter called by the function of the same name

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