just-short-it/Pages/Logout.cshtml.cs

using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;

namespace JustShortIt.Pages;

public class LogoutModel : PageModel {
    public async Task<IActionResult> OnGetAsync() {
        await HttpContext.SignOutAsync(CookieAuthenticationDefaults.AuthenticationScheme);
        return RedirectToPage("Index");
    }
}