howto: http redirect                    rev 16 dec 2021


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is cached in browser:

  Browsers aggressively cache permanent redirects. 
  Will need to clear the browser cache when testing them.
  This won't help other unknown people.
  [16 dec 2021]


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using environment variables:

The use of an expression, like %{env:SERVER_HOST_NAME}, 
at the URL of a <Redirect> is not possible, 
unless it's placed within a <LocationMatch>

Example:

SetEnvIfExpr true SERVER_HOST_NAME=mynewdomain.example
<LocationMatch "^/(?<REMAINING>.*)">
    Redirect permanent https://%{env:SERVER_HOST_NAME}/%{env:MATCH_REMAINING}
</LocationMatch>

  The named group, REMAINING at the <LocationMatch> allows you to
  append the requested URL path to the URL send with the redirect
  response. So the client gets redirect to the same URL path but
  on SERVER_HOST_NAME.


-- https://webmasters.stackexchange.com/questions/124474/httpd-redirect-doesnt-work-with-environment-variables
-- https://httpd.apache.org/docs/2.4/en/mod/mod_alias.html#redirect



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begin 15 aug 2019
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