diff --git a/Makefile b/Makefile
new file mode 100644
index 000000000000..b2283233ba71
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,32 @@
+
+### help:		Show Makefile rules.
+.PHONY: help
+help:
+	@echo Makefile rules:
+	@echo
+	@grep -E '^### [-A-Za-z0-9_]+:' Makefile | sed 's/###/   /'
+
+
+### run:		Start the apimeta server
+.PHONY: run
+run:
+	mkdir -p logs
+	sudo $$(which openresty) -p $$PWD/
+
+
+### stop:		Stop the apimeta server
+.PHONY: stop
+stop:
+	sudo $$(which openresty) -p $$PWD/ -s stop
+
+
+### clean:		Remove generated files
+.PHONY: clean
+clean:
+	rm -rf logs/
+
+
+### reload:		Reload the apimeta server
+.PHONY: reload
+reload:
+	sudo $$(which openresty) -p $$PWD/ -s reload
diff --git a/doc/apimeta-plugin-design.graffle b/doc/apimeta-plugin-design.graffle
index 280a830e28e0..c1cdf5ed3c9f 100644
Binary files a/doc/apimeta-plugin-design.graffle and b/doc/apimeta-plugin-design.graffle differ
diff --git a/lua/apimeta/core/resp.lua b/lua/apimeta/core/resp.lua
index 15597496eaa7..0ba6fa8d3ff6 100644
--- a/lua/apimeta/core/resp.lua
+++ b/lua/apimeta/core/resp.lua
@@ -5,6 +5,8 @@ local ngx_say = ngx.say
 local ngx_exit = ngx.exit
 
 return function (code, body)
+    code = code or 200
+
     if not body then
         ngx_exit(code)
         return
diff --git a/lua/apimeta/plugin.lua b/lua/apimeta/plugin.lua
index c71bb8b3af8b..cba162891362 100644
--- a/lua/apimeta/plugin.lua
+++ b/lua/apimeta/plugin.lua
@@ -66,5 +66,27 @@ function _M.load()
     return plugins
 end
 
+    -- user_config = {
+    --     example_plugin = {i = 1, s = "s", t = {1, 2}},
+    --     invalid_plugin = {a = "a"},
+    -- }
+
+function _M.filter_plugin(user_plugins, local_supported_plugins)
+    -- todo: reuse table
+    local plugins = new_tab(#local_supported_plugins * 2, 0)
+
+    for _, plugin_obj in ipairs(local_supported_plugins) do
+        local name = plugin_obj.name
+        local plugin_conf = user_plugins[name]
+
+        if plugin_conf then
+            insert_tab(plugins, plugin_obj)
+            insert_tab(plugins, plugin_conf)
+        end
+    end
+
+    return plugins
+end
+
 
 return _M
diff --git a/lua/apimeta/route/handler.lua b/lua/apimeta/route/handler.lua
index 925f2795a713..3984fe53c5ec 100644
--- a/lua/apimeta/route/handler.lua
+++ b/lua/apimeta/route/handler.lua
@@ -4,7 +4,6 @@ local ngx = ngx
 local ipairs = ipairs
 local r3router = require("resty.r3")
 local log = require("apimeta.core.log")
-local insert_tab = table.insert
 local new_tab = require("table.new")
 
 local router
@@ -32,7 +31,7 @@ function _M.get_router()
 end
 
 
-local function run_route(params, route, api_ctx)
+local function run_route(matched_params, route, api_ctx)
     ngx.say("run route id: ", route.id, " host: ", api_ctx.host)
 end
 
diff --git a/t/example-plugin.t b/t/example-plugin.t
index 4ef3286fade2..902b41af2fdc 100644
--- a/t/example-plugin.t
+++ b/t/example-plugin.t
@@ -71,3 +71,35 @@ plugin name: example_plugin priority: 1000
 --- error_log
 failed to load plugin not_exist_plugin err: module 'apimeta.plugins.not_exist_plugin' not found
 rewrite(): plugin rewrite phase
+
+
+
+=== TEST 3: filter plugins
+--- config
+    location /t {
+        content_by_lua_block {
+            local plugin = require("apimeta.plugin")
+
+            local all_plugins, err = plugin.load()
+            if not all_plugins then
+                ngx.say("failed to load plugins: ", err)
+            end
+
+            local filter_plugins = plugin.filter_plugin({
+                example_plugin = {i = 1, s = "s", t = {1, 2}},
+                new_plugin = {a = "a"},
+                }, all_plugins)
+
+            local encode_json = require "cjson.safe" .encode
+            for i = 1, #filter_plugins, 2 do
+                local plugin = filter_plugins[i]
+                local plugin_conf = filter_plugins[i + 1]
+                ngx.say("plugin [", plugin.name, "] config: ",
+                        encode_json(plugin_conf))
+            end
+        }
+    }
+--- request
+GET /t
+--- response_body
+plugin [example_plugin] config: {"i":1,"s":"s","t":[1,2]}