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System design URL shortener: Spring Boot 4.1.1, base62 ids, Redis cache-aside, Redis Lua token bucket, 24 tests and live transcripts

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asmhatre
2026-10-22 08:13:35 +00:00
commit aa61ed8786
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output/05-rate-limit.txt
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capacity 5, refill 0.5 tokens/second (one every 2 s)
request 1 -> HTTP/1.1 201 X-RateLimit-Remaining: 4
request 2 -> HTTP/1.1 201 X-RateLimit-Remaining: 3
request 3 -> HTTP/1.1 201 X-RateLimit-Remaining: 2
request 4 -> HTTP/1.1 201 X-RateLimit-Remaining: 1
request 5 -> HTTP/1.1 201 X-RateLimit-Remaining: 0
request 6 -> HTTP/1.1 429 X-RateLimit-Remaining: 0 Retry-After: 2
request 7 -> HTTP/1.1 429 X-RateLimit-Remaining: 0 Retry-After: 2
$ redis-cli HGETALL rl:127.0.0.1
tokens
0.046000000000000082
ts
1792656760797
--- sleeping 2.2 s
request 8 -> HTTP/1.1 201 X-RateLimit-Remaining: 0
--- redirects are not limited: 30 GETs in a row
302 302 302 302 302 302 302 302 302 302 302 302 302 302 302 302 302 302 302 302 302 302 302 302 302 302 302 302 302 302