- Router now enables FileInfoCache with 2s TTL for all static handlers
to reduce redundant os.Stat calls.
- FileInfoCache supports negative caching: missing files are cached
with a shorter TTL to avoid repeated stat on non-existent paths.
- Fix missing fileCache lookup for directory index files (index.html).
Previously handleStandard/handleTryFiles skipped fileCache when
serving index files, causing os.ReadFile on every request even
with file_cache configured.
- Extract tryServeFromFileCache() helper to unify cache hit logic
across file and index-file serving paths.
Verified with wrk 200 conn / 20s on static /index.html:
- Throughput: 140k -> 242k req/sec (+73%)
- alloc_space: 2.6 GB -> 4.6 MB (-99.8%)
xfy
148f43fcb3