Add cache control header to static content

lib/trantor.go

@@ -93,6 +93,7 @@ func downloadHandler(h handler) {
 	headers := h.w.Header()
 	headers["Content-Type"] = []string{"application/epub+zip"}
 	headers["Content-Disposition"] = []string{"attachment; filename=\"" + book.Title + ".epub\""}
+	addCacheControlHeader(h.w, false)
 
 	io.Copy(h.w, f)
 }
@@ -207,7 +208,6 @@ func fileServer(servePath string, prefix string) func(w http.ResponseWriter, r *
 }
 
 func addCacheControlHeader(w http.ResponseWriter, private bool) {
-	// FIXME: cache of download and cover don't depends on user login
 	if private {
 		w.Header().Set("Cache-Control", fmt.Sprintf("max-age=%d, private", cacheMaxAge))
 	} else {