I try to fetch some session data using a svelte frontend and i get a response status 401

This is the code that i use for the cors

router.Use(cors.New(cors.Config{
        AllowOrigins:     []string{"http://localhost:5173"}, // Your frontend URL
        AllowMethods:     []string{"GET", "POST", "PUT", "DELETE"},
        AllowHeaders:     []string{"Origin", "Content-Type"},
        ExposeHeaders:    []string{"Content-Length"},
        AllowCredentials: true,
        MaxAge:           12 * time.Hour,
    }))

and this is the code that i use for the session

    store := cookie.NewStore([]byte(conf.Session.Key))
    store.Options(sessions.Options{
        Path:     "/",
        MaxAge:   3600 * 24,
        Secure:   false,
        HttpOnly: true,
        SameSite: http.SameSiteLaxMode,
    })

and this is the code that make the request for that data

    import { onMount } from 'svelte';
    import { goto } from '$app/navigation';

    async function check() {
        try {
            const response = await fetch('http://localhost:8080/check');
            if(response.ok) {
                const result = await response.json();
                if (result.message === "You are logged in!") {
                    goto('/dashboard');
                } else {
                    console.log('No connection')
                }
            }
        } catch (error){
            console.error('Error', error)
        }
    }

    onMount(() => {
        check();
    });