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Add rate-limit module: Bucket4j 8.21 token buckets on Redis in a Spring Boot 4.1 filter, per-user/per-key/global limits, 429 with Retry-After, two instances sharing one bucket

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Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_017ic4b7rnC7jppGGdHGESvy
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Claude
2026-10-28 18:27:06 +00:00
parent 99a8a0df42
commit fd0cf9b527
37 changed files with 1705 additions and 1 deletions
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rate-limit/output/04-global.txt
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== global limit 12 per minute; four users send 3 requests each
GET /api/hello X-User-Id: u1 -> 200 limit=10 remaining=9 retry-after=null scope=user
GET /api/hello X-User-Id: u1 -> 200 limit=10 remaining=8 retry-after=null scope=user
GET /api/hello X-User-Id: u1 -> 200 limit=10 remaining=7 retry-after=null scope=user
GET /api/hello X-User-Id: u2 -> 200 limit=10 remaining=9 retry-after=null scope=user
GET /api/hello X-User-Id: u2 -> 200 limit=10 remaining=8 retry-after=null scope=user
GET /api/hello X-User-Id: u2 -> 200 limit=10 remaining=7 retry-after=null scope=user
GET /api/hello X-User-Id: u3 -> 200 limit=10 remaining=9 retry-after=null scope=user
GET /api/hello X-User-Id: u3 -> 200 limit=10 remaining=8 retry-after=null scope=user
GET /api/hello X-User-Id: u3 -> 200 limit=10 remaining=7 retry-after=null scope=user
GET /api/hello X-User-Id: u4 -> 200 limit=10 remaining=9 retry-after=null scope=user
GET /api/hello X-User-Id: u4 -> 200 limit=10 remaining=8 retry-after=null scope=user
GET /api/hello X-User-Id: u4 -> 200 limit=10 remaining=7 retry-after=null scope=user
== u5 has never called before, so their own bucket is full
GET /api/hello X-User-Id: u5 -> 429 limit=12 remaining=0 retry-after=5 scope=global
-- u5 was rejected by the global bucket, but their own bucket already paid: 9 of 10 tokens left
== five seconds later (Retry-After), u5 tries again
GET /api/hello X-User-Id: u5 -> 200 limit=10 remaining=8 retry-after=null scope=user