> Header add Link "<https://%{HTTP_HOST}e%{REDIRECT_PDF_CANONICAL_URL}e>; rel=\"canonical\"" env=REDIRECT_PDF_CANONICAL_URL
> However, the %{HTTP_HOST} variable doesn't seem to be set.
I don't think you can expect that environment variable to be defined.
Maybe you want to switch the value argument to use expr= syntax
instead so you can use more built-in values.
> Can you explain where the REDIRECT_ is defined?
If the request has been internally redirected, all of the original
environment variables from before the internal redirect are prefixed
with REDIRECT_
One example of an internal redirect is the result of rewriterule in
htaccess w/o [R] flag.
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