Tentando habilitar cors em um projeto gin

router.go

package routes

import (
	"time"

	cors "github.com/gin-contrib/cors"
	"github.com/gin-gonic/gin"
	"github.com/hyperyuri/webapi-with-go/controllers"
)

func ConfigRoutes(router *gin.Engine) *gin.Engine {
	router.Use(cors.New(cors.Config{
		AllowOrigins:     []string{"*"},
		AllowMethods:     []string{"GET", "HEAD", "OPTIONS", "POST", "PUT", "PATCH", "DELETE"},
		AllowHeaders:     []string{"Origin", "Authorization", "Cookie", "Content-Type"},
		ExposeHeaders:    []string{"Content-Length"},
		AllowCredentials: true,
		AllowOriginFunc: func(origin string) bool {
			return origin == "*"
		},
		MaxAge: 12 * time.Hour,
	}))

	router.Use(cors.Default())

	router.GET("/api/v1/books", controllers.ShowAllBooks)

	return router
}