diff --git a/apps/emqx_authn/src/simple_authn/emqx_authn_http.erl b/apps/emqx_authn/src/simple_authn/emqx_authn_http.erl
index ec2da3237..829ce2282 100644
--- a/apps/emqx_authn/src/simple_authn/emqx_authn_http.erl
+++ b/apps/emqx_authn/src/simple_authn/emqx_authn_http.erl
@@ -284,7 +284,7 @@ replace_placeholders([{K, V0} | More], Credential, Acc) ->
         undefined ->
             error({cannot_get_variable, V0});
         V ->
-            replace_placeholders(More, Credential, [{K, emqx_authn_utils:bin(V)} | Acc])
+            replace_placeholders(More, Credential, [{K, to_bin(V)} | Acc])
     end.
 
 append_query(Path, []) ->
diff --git a/apps/emqx_authz/src/emqx_authz.erl b/apps/emqx_authz/src/emqx_authz.erl
index 2bcb7971d..0b5534608 100644
--- a/apps/emqx_authz/src/emqx_authz.erl
+++ b/apps/emqx_authz/src/emqx_authz.erl
@@ -207,7 +207,12 @@ check_dup_types([Source | Sources], Checked) ->
 create_dry_run(T, Source) ->
     case is_connector_source(T) of
         true ->
-            [NSource] = check_sources([Source]),
+            [CheckedSource] = check_sources([Source]),
+            case T of
+                http ->
+                    URIMap = maps:get(url, CheckedSource),
+                    NSource = maps:put(base_url, maps:remove(query, URIMap), CheckedSource)
+            end,
             emqx_resource:create_dry_run(connector_module(T), NSource);
         false ->
             ok
diff --git a/apps/emqx_authz/src/emqx_authz_api_sources.erl b/apps/emqx_authz/src/emqx_authz_api_sources.erl
index 23c6077fa..df5a6c819 100644
--- a/apps/emqx_authz/src/emqx_authz_api_sources.erl
+++ b/apps/emqx_authz/src/emqx_authz_api_sources.erl
@@ -440,14 +440,15 @@ read_certs(#{<<"ssl">> := SSL} = Source) ->
         {error, Reason} ->
             ?SLOG(error, Reason#{msg => failed_to_readd_ssl_file}),
             throw(failed_to_readd_ssl_file);
-        NewSSL ->
+        {ok, NewSSL} ->
             Source#{<<"ssl">> => NewSSL}
     end;
 read_certs(Source) -> Source.
 
 maybe_write_certs(#{<<"ssl">> := #{<<"enable">> := true} = SSL} = Source) ->
     Type = maps:get(<<"type">>, Source),
-    emqx_tls_lib:ensure_ssl_files(filename:join(["authz", Type]), SSL);
+    {ok, Return} = emqx_tls_lib:ensure_ssl_files(filename:join(["authz", Type]), SSL),
+    maps:put(<<"ssl">>, Return, Source);
 maybe_write_certs(Source) -> Source.
 
 write_file(Filename, Bytes0) ->
diff --git a/apps/emqx_authz/src/emqx_authz_http.erl b/apps/emqx_authz/src/emqx_authz_http.erl
index 4c17f90ec..6d1324c47 100644
--- a/apps/emqx_authz/src/emqx_authz_http.erl
+++ b/apps/emqx_authz/src/emqx_authz_http.erl
@@ -24,6 +24,7 @@
 %% AuthZ Callbacks
 -export([ authorize/4
         , description/0
+        , parse_url/1
         ]).
 
 -ifdef(TEST).
@@ -36,7 +37,7 @@ description() ->
 
 authorize(Client, PubSub, Topic,
             #{type := http,
-              url := #{path := Path} = Url,
+              url := #{path := Path} = URL,
               headers := Headers,
               method := Method,
               request_timeout := RequestTimeout,
@@ -44,7 +45,7 @@ authorize(Client, PubSub, Topic,
              } = Source) ->
     Request = case Method of
                   get  ->
-                      Query = maps:get(query, Url, ""),
+                      Query = maps:get(query, URL, ""),
                       Path1 = replvar(Path ++ "?" ++ Query, PubSub, Topic, Client),
                       {Path1, maps:to_list(Headers)};
                   _ ->
@@ -56,10 +57,32 @@ authorize(Client, PubSub, Topic,
                       Path1 = replvar(Path, PubSub, Topic, Client),
                       {Path1, maps:to_list(Headers), Body1}
               end,
-    case emqx_resource:query(ResourceID,  {Method, Request, RequestTimeout}) of
-        {ok, 204, _Headers} -> {matched, allow};
-        {ok, 200, _Headers, _Body} -> {matched, allow};
-        _ -> nomatch
+    case emqx_resource:query(ResourceID, {Method, Request, RequestTimeout}) of
+        {ok, 200, _Headers} ->
+            {matched, allow};
+        {ok, 204, _Headers} ->
+            {matched, allow};
+        {ok, 200, _Headers, _Body} ->
+            {matched, allow};
+        {ok, _Status, _Headers, _Body} ->
+            nomatch;
+        {error, Reason} ->
+            ?SLOG(error, #{msg => "http_server_query_failed",
+                           resource => ResourceID,
+                           reason => Reason}),
+            ignore
+    end.
+
+parse_url(URL)
+  when URL =:= undefined ->
+    #{};
+parse_url(URL) ->
+    {ok, URIMap} = emqx_http_lib:uri_parse(URL),
+    case maps:get(query, URIMap, undefined) of
+        undefined ->
+            URIMap#{query => ""};
+        _ ->
+            URIMap
     end.
 
 query_string(Body) ->
@@ -88,7 +111,7 @@ replvar(Str0, PubSub, Topic,
                  is_binary(Str0) ->
     NTopic = emqx_http_lib:uri_encode(Topic),
     Str1 = re:replace( Str0, emqx_authz:ph_to_re(?PH_S_CLIENTID)
-                     , Clientid, [global, {return, binary}]),
+                     , bin(Clientid), [global, {return, binary}]),
     Str2 = re:replace( Str1, emqx_authz:ph_to_re(?PH_S_USERNAME)
                      , bin(Username), [global, {return, binary}]),
     Str3 = re:replace( Str2, emqx_authz:ph_to_re(?PH_S_HOST)
@@ -96,9 +119,9 @@ replvar(Str0, PubSub, Topic,
     Str4 = re:replace( Str3, emqx_authz:ph_to_re(?PH_S_PROTONAME)
                      , bin(Protocol), [global, {return, binary}]),
     Str5 = re:replace( Str4, emqx_authz:ph_to_re(?PH_S_MOUNTPOINT)
-                     , Mountpoint, [global, {return, binary}]),
+                     , bin(Mountpoint), [global, {return, binary}]),
     Str6 = re:replace( Str5, emqx_authz:ph_to_re(?PH_S_TOPIC)
-                     , NTopic, [global, {return, binary}]),
+                     , bin(NTopic), [global, {return, binary}]),
     Str7 = re:replace( Str6, emqx_authz:ph_to_re(?PH_S_ACTION)
                      , bin(PubSub), [global, {return, binary}]),
     Str7.
diff --git a/apps/emqx_authz/src/emqx_authz_schema.erl b/apps/emqx_authz/src/emqx_authz_schema.erl
index 884f6e82b..4f7788849 100644
--- a/apps/emqx_authz/src/emqx_authz_schema.erl
+++ b/apps/emqx_authz/src/emqx_authz_schema.erl
@@ -32,10 +32,15 @@
 -export([ namespace/0
         , roots/0
         , fields/1
+        , validations/0
         ]).
 
 -import(emqx_schema, [mk_duration/2]).
 
+%%--------------------------------------------------------------------
+%% Hocon Schema
+%%--------------------------------------------------------------------
+
 namespace() -> authz.
 
 %% @doc authorization schema is not exported
@@ -98,92 +103,24 @@ and the new rules will override all rules from the old config file.
               }}
     ];
 fields(http_get) ->
-    [ {type, #{type => http}}
-    , {enable, #{type => boolean(),
-                 default => true}}
-    , {url, #{type => url()}}
-    , {method,  #{type => get, default => get }}
-    , {headers, #{type => map(),
-                  default => #{ <<"accept">> => <<"application/json">>
-                              , <<"cache-control">> => <<"no-cache">>
-                              , <<"connection">> => <<"keep-alive">>
-                              , <<"keep-alive">> => <<"timeout=5">>
-                              },
-                  converter => fun (Headers0) ->
-                                    Headers1 = maps:fold(fun(K0, V, AccIn) ->
-                                                           K1 = iolist_to_binary(string:to_lower(to_list(K0))),
-                                                           maps:put(K1, V, AccIn)
-                                                        end, #{}, Headers0),
-                                    maps:merge(#{ <<"accept">> => <<"application/json">>
-                                                , <<"cache-control">> => <<"no-cache">>
-                                                , <<"connection">> => <<"keep-alive">>
-                                                , <<"keep-alive">> => <<"timeout=5">>
-                                                }, Headers1)
-                               end
-                 }
-      }
-    , {request_timeout, mk_duration("request timeout", #{default => "30s"})}
-    ]  ++ proplists:delete(base_url, emqx_connector_http:fields(config));
+    [ {method,  #{type => get, default => post}}
+    , {headers, fun headers_no_content_type/1}
+    ] ++ http_common_fields();
 fields(http_post) ->
-    [ {type, #{type => http}}
-    , {enable, #{type => boolean(),
-                 default => true}}
-    , {url, #{type => url()}}
-    , {method,  #{type => post,
-                  default => get}}
-    , {headers, #{type => map(),
-                  default => #{ <<"accept">> => <<"application/json">>
-                              , <<"cache-control">> => <<"no-cache">>
-                              , <<"connection">> => <<"keep-alive">>
-                              , <<"content-type">> => <<"application/json">>
-                              , <<"keep-alive">> => <<"timeout=5">>
-                              },
-                  converter => fun (Headers0) ->
-                                    Headers1 = maps:fold(fun(K0, V, AccIn) ->
-                                                           K1 = iolist_to_binary(string:to_lower(binary_to_list(K0))),
-                                                           maps:put(K1, V, AccIn)
-                                                        end, #{}, Headers0),
-                                    maps:merge(#{ <<"accept">> => <<"application/json">>
-                                                , <<"cache-control">> => <<"no-cache">>
-                                                , <<"connection">> => <<"keep-alive">>
-                                                , <<"content-type">> => <<"application/json">>
-                                                , <<"keep-alive">> => <<"timeout=5">>
-                                                }, Headers1)
-                               end
-                 }
-      }
-    , {request_timeout, mk_duration("request timeout", #{default => "30s"})}
-    , {body, #{type => map(),
-               nullable => true
-              }
-      }
-    ]  ++ proplists:delete(base_url, emqx_connector_http:fields(config));
+    [ {method,  #{type => post, default => post}}
+    , {headers, fun headers/1}
+    ] ++ http_common_fields();
 fields(mnesia) ->
     [ {type,   #{type => 'built-in-database'}}
     , {enable, #{type => boolean(),
                  default => true}}
     ];
 fields(mongo_single) ->
-    [ {collection, #{type => atom()}}
-    , {selector, #{type => map()}}
-    , {type, #{type => mongodb}}
-    , {enable, #{type => boolean(),
-                 default => true}}
-    ] ++ emqx_connector_mongo:fields(single);
+    mongo_common_fields() ++ emqx_connector_mongo:fields(single);
 fields(mongo_rs) ->
-    [ {collection, #{type => atom()}}
-    , {selector, #{type => map()}}
-    , {type, #{type => mongodb}}
-    , {enable, #{type => boolean(),
-                 default => true}}
-    ] ++ emqx_connector_mongo:fields(rs);
+    mongo_common_fields() ++ emqx_connector_mongo:fields(rs);
 fields(mongo_sharded) ->
-    [ {collection, #{type => atom()}}
-    , {selector, #{type => map()}}
-    , {type, #{type => mongodb}}
-    , {enable, #{type => boolean(),
-                 default => true}}
-    ] ++ emqx_connector_mongo:fields(sharded);
+    mongo_common_fields() ++ emqx_connector_mongo:fields(sharded);
 fields(mysql) ->
     connector_fields(mysql) ++
     [ {query, query()} ];
@@ -203,10 +140,87 @@ fields(redis_cluster) ->
     connector_fields(redis, cluster) ++
     [ {cmd, query()} ].
 
+http_common_fields() ->
+    [ {type,            #{type => http}}
+    , {enable,          #{type => boolean(), default => true}}
+    , {url,             #{type => url()}}
+    , {request_timeout, mk_duration("request timeout", #{default => "30s"})}
+    , {body,            #{type => map(), nullable => true}}
+    ] ++ proplists:delete(base_url, emqx_connector_http:fields(config)).
+
+mongo_common_fields() ->
+    [ {collection, #{type => atom()}}
+    , {selector, #{type => map()}}
+    , {type, #{type => mongodb}}
+    , {enable, #{type => boolean(),
+                 default => true}}
+    ].
+
+validations() ->
+    [ {check_ssl_opts, fun check_ssl_opts/1}
+    , {check_headers, fun check_headers/1}
+    ].
+
+headers(type) -> map();
+headers(converter) ->
+    fun(Headers) ->
+       maps:merge(default_headers(), transform_header_name(Headers))
+    end;
+headers(default) -> default_headers();
+headers(_) -> undefined.
+
+headers_no_content_type(type) -> map();
+headers_no_content_type(converter) ->
+    fun(Headers) ->
+       maps:merge(default_headers_no_content_type(), transform_header_name(Headers))
+    end;
+headers_no_content_type(default) -> default_headers_no_content_type();
+headers_no_content_type(_) -> undefined.
+
 %%--------------------------------------------------------------------
 %% Internal functions
 %%--------------------------------------------------------------------
 
+default_headers() ->
+    maps:put(<<"content-type">>,
+             <<"application/json">>,
+             default_headers_no_content_type()).
+
+default_headers_no_content_type() ->
+    #{ <<"accept">> => <<"application/json">>
+     , <<"cache-control">> => <<"no-cache">>
+     , <<"connection">> => <<"keep-alive">>
+     , <<"keep-alive">> => <<"timeout=5">>
+     }.
+
+transform_header_name(Headers) ->
+    maps:fold(fun(K0, V, Acc) ->
+                      K = list_to_binary(string:to_lower(to_list(K0))),
+                      maps:put(K, V, Acc)
+              end, #{}, Headers).
+
+check_ssl_opts(Conf)
+  when Conf =:= #{} ->
+    true;
+check_ssl_opts(Conf) ->
+    case emqx_authz_http:parse_url(hocon_schema:get_value("config.url", Conf)) of
+        #{scheme := https} ->
+            case hocon_schema:get_value("config.ssl.enable", Conf) of
+                true -> ok;
+                false -> false
+            end;
+        #{scheme := http} ->
+            ok
+    end.
+
+check_headers(Conf)
+    when Conf =:= #{} ->
+    true;
+check_headers(Conf) ->
+    Method = to_bin(hocon_schema:get_value("config.method", Conf)),
+    Headers = hocon_schema:get_value("config.headers", Conf),
+    Method =:= <<"post">> orelse (not maps:is_key(<<"content-type">>, Headers)).
+
 union_array(Item) when is_list(Item) ->
     hoconsc:array(hoconsc:union(Item)).
 
@@ -229,15 +243,22 @@ connector_fields(DB, Fields) ->
           catch
               error:badarg ->
                   list_to_atom(Mod0);
-              Error ->
-                  erlang:error(Error)
+              error:Reason ->
+                  erlang:error(Reason)
           end,
     [ {type, #{type => DB}}
     , {enable, #{type => boolean(),
                  default => true}}
-    ] ++ Mod:fields(Fields).
+    ] ++ erlang:apply(Mod, fields, [Fields]).
 
 to_list(A) when is_atom(A) ->
     atom_to_list(A);
 to_list(B) when is_binary(B) ->
     binary_to_list(B).
+
+to_bin(A) when is_atom(A) ->
+    atom_to_binary(A);
+to_bin(B) when is_binary(B) ->
+    B;
+to_bin(L) when is_list(L) ->
+    list_to_binary(L).
diff --git a/apps/emqx_authz/test/emqx_authz_SUITE.erl b/apps/emqx_authz/test/emqx_authz_SUITE.erl
index 130e266fb..d965affee 100644
--- a/apps/emqx_authz/test/emqx_authz_SUITE.erl
+++ b/apps/emqx_authz/test/emqx_authz_SUITE.erl
@@ -36,7 +36,8 @@ init_per_suite(Config) ->
     meck:expect(emqx_resource, remove, fun(_) -> ok end ),
 
     ok = emqx_common_test_helpers:start_apps(
-           [emqx_conf, emqx_authz], fun set_special_configs/1),
+           [emqx_connector, emqx_conf, emqx_authz],
+           fun set_special_configs/1),
     Config.
 
 end_per_suite(_Config) ->
diff --git a/apps/emqx_connector/src/emqx_connector_mongo.erl b/apps/emqx_connector/src/emqx_connector_mongo.erl
index c121bb4c6..6a1b15e57 100644
--- a/apps/emqx_connector/src/emqx_connector_mongo.erl
+++ b/apps/emqx_connector/src/emqx_connector_mongo.erl
@@ -269,7 +269,7 @@ srv_record(_) -> undefined.
 parse_servers(Type, Servers) when is_binary(Servers) ->
     parse_servers(Type, binary_to_list(Servers));
 parse_servers(Type, Servers) when is_list(Servers) ->
-    case string:split(Servers, ",", trailing) of
+    case string:split(Servers, ",", all) of
         [Host | _] when Type =:= single ->
             [Host];
         Hosts ->