diff --git a/apps/dns_proxy/src/dns_handler.erl b/apps/dns_proxy/src/dns_handler.erl
index 45505ea..383b5de 100644
--- a/apps/dns_proxy/src/dns_handler.erl
+++ b/apps/dns_proxy/src/dns_handler.erl
@@ -177,7 +177,7 @@ resolver0(Packet, QueryMsg = #dns_message{qc = 1, questions = [Question = #dns_q
                                     {ok, Resp};
                                 Error ->
                                     lager:debug("[dns_handler] parse reply get error: ~p", [Error]),
-                                    Error
+                                    {error, Error}
                             end
                     after 5000 ->
                         {error, timeout}
@@ -186,7 +186,7 @@ resolver0(Packet, QueryMsg = #dns_message{qc = 1, questions = [Question = #dns_q
     end;
 resolver0(_, Error) ->
     lager:warning("[dns_handler] decode dns query get error: ~p", [Error]),
-    Error.
+    {error, Error}.
 
 -spec forward_to_upstream(Ref :: reference(), Request :: binary(), QueryMsg :: #dns_message{}) -> no_return().
 forward_to_upstream(Ref, Request, QueryMsg) ->
diff --git a/apps/dns_proxy/src/dns_handler_sup.erl b/apps/dns_proxy/src/dns_handler_sup.erl
index 7c7e023..009395d 100644
--- a/apps/dns_proxy/src/dns_handler_sup.erl
+++ b/apps/dns_proxy/src/dns_handler_sup.erl
@@ -38,11 +38,6 @@ start_link() ->
 %% this function is called by the new process to find out about
 %% restart strategy, maximum restart frequency and child
 %% specifications.
--spec(init(Args :: term()) ->
-    {ok, {SupFlags :: {RestartStrategy :: supervisor:strategy(),
-        MaxR :: non_neg_integer(), MaxT :: non_neg_integer()},
-        [ChildSpec :: supervisor:child_spec()]}}
-    | ignore | {error, Reason :: term()}).
 init([]) ->
     SupFlags = #{strategy => simple_one_for_one, intensity => 0, period => 1},
     Spec = #{
diff --git a/apps/dns_proxy/src/dns_zone_loader.erl b/apps/dns_proxy/src/dns_zone_loader.erl
deleted file mode 100644
index 64c6247..0000000
--- a/apps/dns_proxy/src/dns_zone_loader.erl
+++ /dev/null
@@ -1,13 +0,0 @@
--module(dns_zone_loader).
--export([load/1]).
-
--include_lib("dns_erlang/include/dns.hrl").
-
-load(Path) ->
-    {ok, Bin} = file:read_file(Path),
-    {ok, Records} = dns_zone:decode(Bin), % dns_erlang 提供
-    lists:foreach(fun(R) ->
-        Name = R#dns_rr.name,
-        dns_cache:insert(Name, R)
-                  end, Records),
-    ok.