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Closes #1551. ## Problem `/api/*` Go responses emit no `Cache-Control` header. CDNs (Cloudflare, nginx, Varnish) default to caching `application/json` for **15 min – 4 h** when no directive is set. Observed against a public Cloudflare-fronted CoreScope instance (`meshcore.meshat.se`): - 17 consecutive polls of `/api/observers` over ~10 min returned byte-identical responses - Response headers showed `cf-cache-status: HIT`, `age: 878` (~15 min) - Cache-busting query param → `cf-cache-status: MISS` with fresh `last_seen` values This causes WebSocket pushes to diverge from REST GETs (WS fresh, REST stale) and produces false-positive stale/online flips for observers near the 10-min threshold. ## Fix New `noStoreAPIMiddleware` in `cmd/server/routes.go` wired into the gorilla/mux chain alongside the existing `backfillStatusMiddleware`. Sets `Cache-Control: no-store` on every response whose request path starts with `/api/`. ## Design choice: `no-store` vs `private, max-age=0` Chose `no-store`. CoreScope's REST endpoints are fresh-on-every-request by contract (WS pushes diff against REST GETs), so any intermediary cache is wrong. `no-store` forbids **any** cache (CDN, browser, intermediary). `private, max-age=0` still permits short browser caches and some intermediaries — no benefit here. ## Scope discipline - `/api/` prefix only. - Static assets (`/`, `/app.js`, `/style.css`, …) keep their existing `no-cache, no-store, must-revalidate` headers from `spaHandler` in `main.go`. Hashed assets stay CDN-cacheable by design. - The middleware runs for **all** registered routes including the websocket upgrade HTTP request, since `/ws` is served through the same mux. ## TDD - **Red** `1beb5432`: `cmd/server/cache_control_api_test.go` asserts `Cache-Control: no-store` on `/api/stats`, `/api/observers`, `/api/packets`, `/api/nodes`, and asserts the middleware does NOT leak onto `/` or `/app.js`. Fails on assertion (no Cache-Control header emitted) — not a compile error. - **Green** `13be675f`: middleware + wiring. All assertions pass; full `cmd/server` suite stays green. ## Files - `cmd/server/routes.go` — middleware definition + `r.Use(noStoreAPIMiddleware)` - `cmd/server/cache_control_api_test.go` — 6 sub-tests across 2 top-level tests ## Preflight `bash ~/.openclaw/skills/pr-preflight/scripts/run-all.sh origin/master` → clean (exit 0). --------- Co-authored-by: corescope-bot <bot@corescope>