Ticket 0054-FE section 5: (1) with the SSR flag on, /_frontend/assets/* is now proxied to the VPS release as well, deliberately without a file-exists guard so stale local SPA hashes cannot shadow the release; the proxy rules tag requests with env SSRPROXY and mod_headers adds X-Forwarded-Proto: https. (3) If-None-Match comparison in JsonCacheHeaders accepts the -gzip suffix that mod_deflate appends, so browser 304s work through compression. (4) X-TYPO3-Cache-Tags*/-Debug-Cache/-Cache-Lifetime/-Parsetime are stripped from responses (onsuccess and always tables - they leak record ids and overflowed the SSR node 16 KB header limit on news pages).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
New JsonCacheHeaders middleware (outer, frontend stack): GET/HEAD 200 responses under /_json get a single Cache-Control: no-cache, Expires: 0 and a content md5 ETag; If-None-Match answers as empty 304. Logged-in visitors (fe_typo_user) keep TYPO3 headers. Expires: 0 is deliberate so mod_expires leaves the response alone. .htaccess: the global Header unset ETag now skips /_json (KEEP_ETAG env, carried across the mod_rewrite internal redirect as REDIRECT_KEEP_ETAG). Fulfils tickets 0011-FE point 3 and 0055-BE question 6; asset immutable headers were already live.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>