How to redirect user to client app after logging out from identity server?

Question

I want to redirect user to the same client after he logged out from that client. So if i have lets say 5 clients on one identity server, i want users to be able to log out from

Answer 1

You are not supposed to set the uri manually. Actually the default logout method from the IdentityServer samples works fine.

When you try the 3_ImplicitFlowAuthentication sample project, you'll see PostLogoutRedirectUri is not null and the redirection works (but not automatically).

The reason why PostLogoutRedirectUri is null in your case is probably because the id_token is not preserved. In MvcClient.Startup make sure you add this line:

options.SaveTokens = true;

That will preserve the tokens in a cookie.

In order to automatically redirect back to the client, make a few adjustments to the sample code. In IdentityServer AccountOptions set

AutomaticRedirectAfterSignOut = true;

In the AccountController.Logout method add the following lines:

if (vm.AutomaticRedirectAfterSignOut && 
               !string.IsNullOrWhiteSpace(vm.PostLogoutRedirectUri))
    return Redirect(vm.PostLogoutRedirectUri);

Just before the last line:

return View("LoggedOut", vm);

When you run the sample again you should see that the user is now automatically returned to the client after logout.