Add idempotency module: Idempotency-Key for POST APIs on Spring Boot 4.1.2 with Redis and Postgres stores

One servlet filter, two interchangeable stores, 18 tests (9 scenarios x 2 stores) against a real redis-server 7.0.15 and PostgreSQL 16.15, and 20 captured transcripts under output/: replay, 422 on a changed body, concurrent duplicates, expiry, the crash window and a handler slower than the lock. Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_017ic4b5yg8grY17JsVAJviV
2026-11-08 18:22:05 +00:00
parent 8da3374155
commit 6a36e84858
44 changed files with 1459 additions and 0 deletions
@@ -0,0 +1,5 @@
+store: redis
+attempt 1: client gave up after 300 ms (the server is still working)
+attempt 2, 300 ms later            -> HTTP 409  replayed=-    retry-after=1    {"title":"A request is outstanding for this Idempotency-Key","status":409}
+attempt 3, after the first finished -> HTTP 201  replayed=true retry-after=-    {"id":1,"customer":"cus_42","amount":1999,"currency":"INR"}
+payments in the table: 1