New plugin: fastcache — a two-tier HTTP response cache for Caddy

Plugins
1

http.handlers.fastcache caches GET/HEAD responses proxy_cache-style — a RAM tier for small bodies plus a disk tier served via kernel sendfile. It does singleflight miss coalescing, stale_while_revalidate/stale_if_error, Vary variants, templated cache_key, PURGE requests plus an admin API for regex bulk purge, and Prometheus metrics.

http://localhost:9083 {
    route {
        fastcache {
            path                     /var/cache/fastcache
            memory_size              64MB
            disk_size                1GB
            ttl                      1h
            stale_while_revalidate   30s
            max_items                100000
            vary                     Accept-Encoding
            purge_allow              10.0.0.0/8
        }
        reverse_proxy localhost:9081
    }
}

Performance:
benchmarked side-by-side on the same machine against nginx proxy_cache, caddy + souin, and a plain caddy file_server. On cache hits fastcache reaches ~93% of nginx throughput and ~2–4× souin; on large bodies served via sendfile it beats nginx ~1.7×. The run.sh script in the repo reproduces the comparison.

Install: xcaddy build --with github.com/frontyard/fastcache, or tick it on the download page.