我用 GO 語言為 KrakenD Gateway 編寫了一個簡單的服務器插件。它在路由開始之前注入代碼。我正在嘗試從我的配置中讀取配置設置，krakend.json以便在啟動時將設置傳遞給我的插件。下面我以設置mysetting為例（請看注釋之間的代碼HERE THE READ OF MY SETTING STARTS/ENDS）。如何使用mysetting插件內部配置的值？這是我在啟動時krakend.json用作-c參數的配置文件：{  "version": 2,  "timeout": "3000ms",  "cache_ttl": "300s",  "output_encoding": "json",  "name": "Gateway",  "plugin": {    "pattern": ".so",    "folder": "./plugins/"  },  "extra_config": {    "github_com/devopsfaith/krakend/transport/http/server/handler": {      "name": "testPlugin",      "mysetting": "Hello"    }  },  "endpoints": [    ...  ],  "port": 9010,}這是 registerHandlers 函數的代碼：func (r registerer) registerHandlers(ctx context.Context, extra map[string]interface{}, _ http.Handler) (http.Handler, error) {            // check the passed configuration and initialize the plugin        name, ok := extra["name"].(string)                if !ok {            return nil, errors.New("wrong config")        }                if name != string(r) {            return nil, fmt.Errorf("unknown register %s", name)        }        //************ HERE THE READ OF MY SETTING STARTS ************                setting, ok := extra["mysetting"].(string)        if !ok {            return nil, errors.New("mysetting missing in config")        }        fmt.Printf("PLUGIN: My custom setting: %s\n", setting)                //************ HERE THE READ OF MY SETTING ENDS ************                // return the actual handler wrapping or your custom logic so it can be used as a replacement for the default http handler        return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {            fmt.Fprintf(w, "%s, %q", setting, html.EscapeString(req.URL.Path))        }), nil}