Reply To: Mirroring Multiple URLs, but different homepages?

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However, it doesn’t if I use the full URL

Right, it only matches an empty URL (e.g., “/”). From your description, it sounded like you wanted all specified URLs to go through normally.

If you want to catch the index page too, just make it an optional part of the pattern:

RewriteCond %{HTTP_HOST} domain1example\.com$
RewriteRule ^(index.html)?$ /domain-1-home-page.html