Response.RedirectToRoute(RouteData.Values) redirects to the Area controller - asp.net-mvc-routing

Question

I am trying to setup a BaseController to handle culture as part of the url (based on ASP.NET MVC 5 Internationalization). My implementation works properly as long as I disable my Areas' registration.
When One of my Area is registered, if I try to input a wrong/not supported culture (http://localhost:52639/zz/), I experience a 404 error with a request URL: http://localhost:52639/fr/Test/Post.
I have checked my routes are properly registered.
If I do the same while disabling the Areas registration, the base controller and routing behave correctly if I type the following URL: http://localhost:52639/zz/ I am redirected to http://localhost:52639/fr/ (default culture).
Those are my routes:
public static void RegisterRoutes(RouteCollection routes)
{
var namespaces = new[]{typeof(PostController).Namespace};
routes.IgnoreRoute("favicon.ico");
routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
routes.MapRoute("PostToHack", "{culture}/Post/{idAndSlug}", new { culture = "", Controller = "Post", Action = "Show" }, namespaces);
routes.MapRoute("Post", "{culture}/Post/{id}-{slug}", new { culture = "", Controller = "Post", Action = "Show" }, namespaces);
routes.MapRoute("TagToHack", "{culture}/Tag/{idAndSlug}", new { culture = "", Controller = "Post", Action = "Tag" }, namespaces);
routes.MapRoute("Tag", "{culture}/Tag/{id}-{slug}", new { culture = "", Controller = "Post", Action = "Tag" }, namespaces);
routes.MapRoute("Logout", "{culture}/Logout", new { culture = "", Controller = "Authentication", Action = "Logout" }, namespaces);
routes.MapRoute("Login", "{culture}/Login", new { culture = "", Controller = "Authentication", Action = "Login" }, namespaces);
//Error routes
routes.MapRoute("Error404", "{culture}/errors/404", new { culture = "", Controller = "Errors", Action = "NotFound" }, namespaces);
routes.MapRoute("Error500", "{culture}/errors/500", new { culture = "", Controller = "Errors", Action = "Error" }, namespaces);
routes.MapRoute("Home", "{culture}", new { culture = "", Controller = "Post", Action = "Index"},namespaces);
//Never to be called by user which is why it comes after MapRoute Home so it is always overwritten by it
routes.MapRoute("Sidebar", "{culture}", new { culture = "", Controller = "Layout", Action = "Sidebar"},namespaces);//This is a "child-only" controller
routes.MapRoute("NavigationBar", "{culture}", new { culture = "", Controller = "Layout", Action = "NavigationBar"},namespaces);//This is a "child-only" controller
Area Route
public override void RegisterArea(AreaRegistrationContext context)
{
var namespaces = new[] { typeof(PostsController).Namespace };
context.MapRoute(
"admin_default",
"{culture}/admin/{controller}/{action}/{id}",
new { culture = "", action = "Index", id = UrlParameter.Optional }, namespaces
);
}
Base Controller:
public class BaseController : Controller
{
protected override IAsyncResult BeginExecuteCore(AsyncCallback callback, object state)
{
var cultureName = RouteData.Values["culture"] as string;
// Attempt to read the culture cookie from Request
if (cultureName == null)
cultureName = (Request.UserLanguages != null) && (Request.UserLanguages.Length > 0)
? Request.UserLanguages[0]
: null; // obtain it from HTTP header AcceptLanguages
// Validate culture name
cultureName = CultureHelper.GetImplementedCulture(cultureName); // This is safe
if (RouteData.Values["culture"] as string != cultureName)
{
// Force a valid culture in the URL
RouteData.Values["culture"] = cultureName.ToLowerInvariant(); // lower case too
// Redirect user
Response.RedirectToRoute(RouteData.Values);
}
// Modify current thread's cultures
Thread.CurrentThread.CurrentCulture = new CultureInfo(cultureName);
Thread.CurrentThread.CurrentUICulture = Thread.CurrentThread.CurrentCulture;
return base.BeginExecuteCore(callback, state);
}
}

Answer 1

After some more digging I have found a solution that work for me. My issue was coming from the order in which I was registering my routes. I was registering my Area's routes first:
protected void Application_Start()
{
AreaRegistration.RegisterAllAreas();
RouteConfig.RegisterRoutes(RouteTable.Routes);
}
I inverted the order and made sure that I was only registering my Area's routes after:
protected void Application_Start()
{
RouteConfig.RegisterRoutes(RouteTable.Routes);
AreaRegistration.RegisterAllAreas();
}