update

main.go

@@ -268,12 +268,13 @@ func authHandler(st *state) http.Handler {
 			return
 		}
 		if decide(st, ip) {
-			// optional: reflect info for debugging
+			log.Printf("Allowed: %s", ip)
 			w.Header().Set("X-IPFilter-Client", ip.String())
 			w.WriteHeader(http.StatusOK)
 			_, _ = w.Write([]byte("OK"))
 			return
 		}
+		log.Printf("Blocked: %s", ip)
 		w.Header().Set("X-IPFilter-Client", ip.String())
 		http.Error(w, "forbidden by ip filter", http.StatusForbidden)
 	})