diff --git a/apps/emqx_dashboard/src/emqx_dashboard_swagger.erl b/apps/emqx_dashboard/src/emqx_dashboard_swagger.erl
index 4a8072804..4a316e248 100644
--- a/apps/emqx_dashboard/src/emqx_dashboard_swagger.erl
+++ b/apps/emqx_dashboard/src/emqx_dashboard_swagger.erl
@@ -345,15 +345,7 @@ parse_spec_ref(Module, Path, Options) ->
             erlang:apply(Module, schema, [Path])
         catch
             Error:Reason:Stacktrace ->
-                %% This error is intended to fail the build
-                %% hence print to standard_error
-                io:format(
-                    standard_error,
-                    "Failed to generate swagger for path ~p in module ~p~n"
-                    "error:~p~nreason:~p~n~p~n",
-                    [Module, Path, Error, Reason, Stacktrace]
-                ),
-                error({failed_to_generate_swagger_spec, Module, Path})
+                failed_to_generate_swagger_spec(Module, Path, Error, Reason, Stacktrace)
         end,
     OperationId = maps:get('operationId', Schema),
     {Specs, Refs} = maps:fold(
@@ -369,6 +361,24 @@ parse_spec_ref(Module, Path, Options) ->
     RouteOpts = generate_route_opts(Schema, Options),
     {OperationId, Specs, Refs, RouteOpts}.
 
+-ifdef(TEST).
+-spec failed_to_generate_swagger_spec(_, _, _, _, _) -> no_return().
+failed_to_generate_swagger_spec(Module, Path, _Error, _Reason, _Stacktrace) ->
+    error({failed_to_generate_swagger_spec, Module, Path}).
+-else.
+-spec failed_to_generate_swagger_spec(_, _, _, _, _) -> no_return().
+failed_to_generate_swagger_spec(Module, Path, Error, Reason, Stacktrace) ->
+    %% This error is intended to fail the build
+    %% hence print to standard_error
+    io:format(
+        standard_error,
+        "Failed to generate swagger for path ~p in module ~p~n"
+        "error:~p~nreason:~p~n~p~n",
+        [Module, Path, Error, Reason, Stacktrace]
+    ),
+    error({failed_to_generate_swagger_spec, Module, Path}).
+
+-endif.
 generate_route_opts(Schema, Options) ->
     #{filter => compose_filters(filter(Options), custom_filter(Schema))}.
 
diff --git a/apps/emqx_dashboard/test/emqx_swagger_response_SUITE.erl b/apps/emqx_dashboard/test/emqx_swagger_response_SUITE.erl
index d84f17c44..376ace5c2 100644
--- a/apps/emqx_dashboard/test/emqx_swagger_response_SUITE.erl
+++ b/apps/emqx_dashboard/test/emqx_swagger_response_SUITE.erl
@@ -317,68 +317,72 @@ t_sub_fields(_Config) ->
     validate(Path, Object, ExpectRefs),
     ok.
 
-t_complicated_type(_Config) ->
+t_complex_type(_Config) ->
     Path = "/ref/complex_type",
-    Object = #{
-        <<"content">> => #{
-            <<"application/json">> =>
-                #{
-                    <<"schema">> => #{
-                        <<"properties">> =>
-                            [
-                                {<<"no_neg_integer">>, #{minimum => 0, type => integer}},
-                                {<<"url">>, #{example => <<"http://127.0.0.1">>, type => string}},
-                                {<<"server">>, #{example => <<"127.0.0.1:80">>, type => string}},
-                                {<<"connect_timeout">>, #{
-                                    example => infinity,
-                                    <<"oneOf">> => [
-                                        #{example => infinity, type => string},
-                                        #{type => integer}
-                                    ]
-                                }},
-                                {<<"pool_type">>, #{enum => [random, hash], type => string}},
-                                {<<"timeout">>, #{
-                                    example => infinity,
-                                    <<"oneOf">> => [
-                                        #{example => infinity, type => string}, #{type => integer}
-                                    ]
-                                }},
-                                {<<"bytesize">>, #{example => <<"32MB">>, type => string}},
-                                {<<"wordsize">>, #{example => <<"1024KB">>, type => string}},
-                                {<<"maps">>, #{example => #{}, type => object}},
-                                {<<"comma_separated_list">>, #{
-                                    example => <<"item1,item2">>, type => string
-                                }},
-                                {<<"comma_separated_atoms">>, #{
-                                    example => <<"item1,item2">>, type => string
-                                }},
-                                {<<"log_level">>, #{
-                                    enum => [
-                                        debug,
-                                        info,
-                                        notice,
-                                        warning,
-                                        error,
-                                        critical,
-                                        alert,
-                                        emergency,
-                                        all
-                                    ],
-                                    type => string
-                                }},
-                                {<<"fix_integer">>, #{
-                                    default => 100, enum => [100], type => integer
-                                }}
-                            ],
-                        <<"type">> => object
-                    }
-                }
-        }
-    },
     {OperationId, Spec, Refs, #{}} = emqx_dashboard_swagger:parse_spec_ref(?MODULE, Path, #{}),
     ?assertEqual(test, OperationId),
     Response = maps:get(responses, maps:get(post, Spec)),
-    ?assertEqual(Object, maps:get(<<"200">>, Response)),
+    ResponseBody = maps:get(<<"200">>, Response),
+    Content = maps:get(<<"content">>, ResponseBody),
+    JsonContent = maps:get(<<"application/json">>, Content),
+    Schema = maps:get(<<"schema">>, JsonContent),
+    ?assertMatch(#{<<"type">> := object}, Schema),
+    Properties = maps:get(<<"properties">>, Schema),
+    ?assertMatch(
+        [
+            {<<"no_neg_integer">>, #{minimum := 0, type := integer}},
+            {<<"url">>, #{
+                example := <<"http://127.0.0.1">>, type := string
+            }},
+            {<<"server">>, #{
+                example := <<"127.0.0.1:80">>, type := string
+            }},
+            {<<"connect_timeout">>, #{
+                example := _, type := string
+            }},
+            {<<"pool_type">>, #{
+                enum := [random, hash], type := string
+            }},
+            {<<"timeout">>, #{
+                example := infinity,
+                <<"oneOf">> := [
+                    #{example := infinity, type := string},
+                    #{type := integer}
+                ]
+            }},
+            {<<"bytesize">>, #{
+                example := <<"32MB">>, type := string
+            }},
+            {<<"wordsize">>, #{
+                example := <<"1024KB">>, type := string
+            }},
+            {<<"maps">>, #{example := #{}, type := object}},
+            {<<"comma_separated_list">>, #{
+                example := <<"item1,item2">>, type := string
+            }},
+            {<<"comma_separated_atoms">>, #{
+                example := <<"item1,item2">>, type := string
+            }},
+            {<<"log_level">>, #{
+                enum := [
+                    debug,
+                    info,
+                    notice,
+                    warning,
+                    error,
+                    critical,
+                    alert,
+                    emergency,
+                    all
+                ],
+                type := string
+            }},
+            {<<"fix_integer">>, #{
+                default := 100, enum := [100], type := integer
+            }}
+        ],
+        Properties
+    ),
     ?assertEqual([], Refs),
     ok.
 
@@ -647,9 +651,8 @@ schema("/ref/complex_type") ->
                     {no_neg_integer, hoconsc:mk(non_neg_integer(), #{})},
                     {url, hoconsc:mk(url(), #{})},
                     {server, hoconsc:mk(emqx_schema:ip_port(), #{})},
-                    {connect_timeout,
-                        hoconsc:mk(emqx_bridge_http_connector:connect_timeout(), #{})},
-                    {pool_type, hoconsc:mk(emqx_bridge_http_connector:pool_type(), #{})},
+                    {connect_timeout, hoconsc:mk(emqx_schema:timeout_duration(), #{})},
+                    {pool_type, hoconsc:mk(hoconsc:enum([random, hash]), #{})},
                     {timeout, hoconsc:mk(timeout(), #{})},
                     {bytesize, hoconsc:mk(emqx_schema:bytesize(), #{})},
                     {wordsize, hoconsc:mk(emqx_schema:wordsize(), #{})},