static file caching/serving seems to work

src/fd_sfc_entry.erl

@@ -50,7 +50,7 @@ contents(#e{contents = X}) -> X.
 % returns not_found if ANY I/O error occurs during the process. will be logged
 
 new(Path) ->
-    tell("~tp:new(~tp)", [?MODULE, Path]),
+    log(info, "~tp:new(~tp)", [?MODULE, Path]),
     case file:read_file(Path) of
         {ok, Binary} ->
             {found, new2(Path, Binary)};