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: postgres
+POST /payments  key=k-1            -> HTTP 201  replayed=-    retry-after=-    {"id":1,"customer":"cus_42","amount":1999,"currency":"INR"}
+POST /payments  key=k-1 (retry)    -> HTTP 201  replayed=true retry-after=-    {"id":1,"customer":"cus_42","amount":1999,"currency":"INR"}
+payments in the table: 1
+what the store holds: row status COMPLETED, response_status 201