How i can fetch session data?

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();    });