package internal import ( "net/http" "within.website/x" ) func UnchangingCache(h http.Handler) http.Handler { if x.Version == "devel" { return h } return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { w.Header().Set("Cache-Control", "public, max-age=31536000") h.ServeHTTP(w, r) }) }