How does redirect to returnUrl work in Asp.Net MVC5

Question

I\'ve started a new MVC 5 site, using the new Asp.Net Identity with Owin. In my \"account\" controller which has the attribute [Authorize], I have fairly standard actions;

Answer 1

As Sandeep Phadke told, the returnUrl Parameter is filled, because of configuration in startup.Auth.cs.

The CookieAuthenticationOptions has a property ReturnUrlParameter which is by Default set to "returnUrl". That is the reason, why it looks like magic. You can Change it to whatever you want:

app.UseCookieAuthentication(new CookieAuthenticationOptions
    {
        AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
        LoginPath = new PathString("/Account/Login"),
        ReturnUrlParameter = "returnTo"
    });

Then you can Change the AccountController Login-Action to:

[AllowAnonymous]
    public ActionResult Login(string returnTo)
    {
        ViewBag.ReturnUrl = returnTo;
        return View();
    }