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Verifying a server/API change

The handle is curl (or equivalent). The evidence is the response.

Pattern

  1. Start the server (background, with a readiness poll — see below)
  2. curl the route the diff touches, with inputs that hit the changed branch
  3. Capture the full response (status + headers + body)
  4. Compare to expected

Lifecycle

If there's a run-skill it handles this. If not:

<start-command> &> /tmp/server.log &
SERVER_PID=$!
for i in {1..30}; do curl -sf localhost:PORT/health >/dev/null && break; sleep 1; done
# ... your curls ...
kill $SERVER_PID

No readiness endpoint? Poll the route you're about to test until it stops returning connection-refused, then add a beat.

Worked example

Diff: adds a Retry-After header to 429 responses in rateLimit.ts. Claim (PR body): "clients can now back off correctly."

Inference: hitting the rate limit should now return Retry-After: <n> in the response headers. It didn't before.

Plan:

  1. Start server
  2. Hit the rate-limited endpoint enough times to trigger 429
  3. Check the 429 response has Retry-After header
  4. Check the value is a positive integer

Execute:

# trigger the limit — 10 fast requests, limit is 5/sec per the diff
for i in {1..10}; do curl -s -o /dev/null -w "%{http_code}\n" localhost:3000/api/thing; done
# → 200 200 200 200 200 429 429 429 429 429

# capture the 429 headers
curl -si localhost:3000/api/thing | head -20
# → HTTP/1.1 429 Too Many Requests
# → Retry-After: 12
# → ...

Verdict: PASS — Retry-After: 12 present, positive integer.

What FAIL looks like

  • Header absent → the diff didn't take effect, or you're not actually hitting the 429 path (check the status code first)
  • Header present but value is NaN / undefined / negative → the logic is wrong
  • You got 200s all the way through → you never triggered the changed path. Tighten the request burst or check the rate limit config.