```go func main() { router := gin.Default() // 简单的路由组: v1 v1 := router.Group("/v1") { v1.POST("/login", loginEndpoint) v1.POST("/submit", submitEndpoint) v1.POST("/read", readEndpoint) } // 简单的路由组: v2 v2 := router.Group("/v2") { v2.POST("/login", loginEndpoint) v2.POST("/submit", submitEndpoint) v2.POST("/read", readEndpoint) } router.Run(":8080") } ```