Program.cs

using ExampleSPA;
using Microsoft.AspNetCore.Localization.Routing;
using Microsoft.AspNetCore.Mvc.Razor;
using System.Globalization;
using Microsoft.Extensions.Options;
using Microsoft.AspNetCore.Localization;

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddRazorPages().AddViewLocalization(LanguageViewLocationExpanderFormat.SubFolder);
builder.Services.Configure<RequestLocalizationOptions>(options =>
{
    var supportedCultures = new[] { "it-IT" , "en-GB"};
    options
        .AddSupportedCultures(supportedCultures)
        .SetDefaultCulture(supportedCultures[0])
        .AddSupportedUICultures(supportedCultures);
});
builder.Services.ConfigureApplicationCookie(options =>
{
    options.Cookie.SameSite = SameSiteMode.None;
    options.Cookie.SecurePolicy = CookieSecurePolicy.None;
});


var app = builder.Build();

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error");
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
}



app.UseHttpsRedirection();
app.UseStaticFiles();

app.UseRouting();

app.UseRequestLocalization();

app.UseAuthorization();

app.UseEndpoints(endpoints =>
{
    endpoints.MapRazorPages();
    //endpoints.MapControllerRoute(name: "culture-route", pattern:"{culture=en-US}/{controller=Home}/{action=Index}/{id?}");
    //endpoints.MapControllerRoute( name: "default", pattern: "{controller=Home}/{action=Index}/{id?}");
});

app.Run();