- System > This installation > Address has a field and a link to the other
spelling (with or without www), like the WordPress address. It writes
SITE_ORIGIN to .env through Environment::write and takes effect on the
next request. With SITE_ORIGIN from the server environment there is no
field, and a POST is refused.
- Before saving, OriginCheck requests /.well-known/kantsites-origin under the
new address; it has to return an HMAC of APP_SECRET that only this
installation knows. Switching to www without DNS or certificate would
otherwise send every page, the administration included, nowhere. "Save
anyway" appears only after a refusal. The probe also answers during
maintenance.
- The message says when the administration changes host and needs a new
sign-in, since the session cookie belongs to one spelling.
Tests: 584 PHPUnit on PHP 8.2 and 8.4, 35 node, test:editor and
test:browser green (test:browser reports only the known editor colour
contrast on /grundlagen).
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
kantarciandClaude Opus 5
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