A multisite setup uses the same maincore.php
Hence, it should be like this:
maincore.php
site_1/
site_2/
site_3/
infusions/
Then you do a mask. from site_1/ to another unique url on your host. That was how it was done in the earlier days.
However, the Multisite on Version 9 is untested during development as it was never covered.
1. SEO filepath might not work.
2. There should be a multisite controller in the Admin CP to properly setup and do this task so we can embed generate code on the htaccess level, and other things.
3. Masking domain must be supported by the host. I'm not sure on this at this moment even with our host.
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