The trigger: PR #458 mounted requireCustomerPortalEnabled which
410'd every /api/customer/* + /api/admin/customers/* request when
the master toggle was off. Some browsers cached that 410 (no
Cache-Control header was set, so heuristic freshness applied —
the wrong default for an authenticated/sensitive surface).
PR #470 reverted the middleware, but a customer whose tab cached
the 410 still saw 410s until they hard-refreshed.
Add noStoreCache middleware and mount it in front of both route
groups. Every response (200, 4xx, 5xx) now carries
`Cache-Control: no-store, no-cache, must-revalidate, private`
plus the HTTP/1.0 Pragma + Expires fallbacks. Any future
transient error from these endpoints can no longer get pinned in
browser or proxy caches and outlive its cause.
Cost is one setHeader per request; applied per route group rather
than globally so static assets + galleries keep their own caching
strategy unchanged.
Includes a dedicated unit test pinning the header set so a future
cleanup pass can't quietly drop it and re-introduce the bug.
Paul Nothaft
3122dd08a8