Document a conditional redirect in .htaccess in a suitable place.

[janwillemstegink]

Before internet.nl is testing both without and with www, some practical knowledge may help.

For advanced conditional logic, Apache 2.4 introduced Apache Expression Language (mod_expr).
The first URL via HTTPS can be refreshed, as security headers strictly require, with a conditional redirect.

Redirect in .htaccess if www:
<If "%{HTTP_HOST} =~ /^www.example.com$/">
# Redirect 302 / https://example.com/

Redirect in .htaccess if no www:
<If "! (%{HTTP_HOST} =~ /^www.example.com$/)">
Redirect 302 / https://www.example.com/
</If

My suggestion is to document a conditional redirect in .htaccess in a suitable place.

This issue has been edited for these notes:

• The escaped dot for Apache configuration is not visible in HTML, therefore also a screenshot;
• The Redirect directive may not work within . Maybe use RedirectMatch or Rewrite some way;
• An example for Nginx would complete.

[bwbroersma]

Probably the toolbox-wiki is the best location for configuration samples.
However domain canonicalization issues are not in scope of Internet.nl, in the sense that these - to my knowledge - are not listed in a 'comply or explain', NCSC guideline or other Best Current Practices.