fix: correct some issues

internal/config-server/cmd/api/api.go

@@ -36,6 +36,9 @@ func main(cfg config.Config) {
 	app.GET("/healthz", func(c echo.Context) error { return c.NoContent(http.StatusNoContent) })
 
 	api := app.Group("/api")
+	api.GET("/", func(c echo.Context) error {
+		return c.String(http.StatusOK, "Enter path in order to retrieve config")
+	})
 	api.GET("/:endpoint", configHandler.Get)
 
 	if err := app.Start(fmt.Sprintf(":%d", cfg.API.Port)); !errors.Is(err, http.ErrServerClosed) {

internal/handler/config.go

@@ -26,7 +26,7 @@ func (h *Config) Get(c echo.Context) error {
 			return c.String(http.StatusInternalServerError, err.Error())
 		}
 
-		mergeMaps(config, engineConfig)
+		return c.JSON(http.StatusOK, mergeMaps(config, engineConfig))
 	}
 
 	return c.JSON(http.StatusOK, config)
@@ -35,12 +35,16 @@ func (h *Config) Get(c echo.Context) error {
 func mergeMaps(cfg, engineCfg map[string]interface{}) map[string]interface{} {
 	merged := make(map[string]interface{})
 
-	for k, v := range engineCfg {
-		merged[k] = v
+	if engineCfg != nil {
+		for k, v := range engineCfg {
+			merged[k] = v
+		}
 	}
 
-	for k, v := range cfg {
-		merged[k] = v
+	if cfg != nil {
+		for k, v := range cfg {
+			merged[k] = v
+		}
 	}
 
 	return merged