Production static file serving now uses FileInfoCache by default
with a 2-second TTL in router.go, dramatically reducing os.Stat
syscalls for missing files and repeated paths.
Changes:
- Add negative cache support to FileInfoCache (caches 'not found' results)
- Introduce statWithCache() helper in StaticHandler for uniform caching
- Make FileInfoCache TTL configurable via SetTTL()
- Default cacheTTL=0 disables caching in NewStaticHandler (tests compat)
- router.go enables fileInfoCache with 2s TTL for all static handlers
Benchmark (repeated 404s):
No cache: ~2651 ns/op, 2225 B/op, 15 allocs/op
With cache: ~1505 ns/op, 1905 B/op, 12 allocs/op
Improvement: -43% latency, -14% allocations
This addresses the dominant allocation source in v0.4.0 profile
(os.statNolog at 74.95% of allocations).
xfy
1128eb644f