First switch-on with a running node: Apache mod_dir turns / into /index.html via the DirectoryIndex subrequest before the per-dir root rule can proxy it; the node then asked for /_json/index.html and rendered a cacheable 404 homepage. New flag-gated rule proxies index.html as / to the node. Companion fix outside git: public/_frontend/.htaccess (build output, gitignored) overrides the root rewrites for /_frontend/*, so release assets only existing on the VPS were answered by its SPA fallback with index.html - HTML served as JS; the flag-gated asset proxy now also sits in that file before the fallback, and the frontend build must adopt it in its .htaccess template (ticket 0059-BE).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
orascheandClaude Fable 5
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