c# - How does an MVC app know where to redirect the user when using the [Authorize] attribute? -

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if setup mvc app authentication , use [authorize] tag, automatically redirect unauthenticated users login view.

but how know page is login page? i've looked through example app, couldn't find obvious.

edit

i forgot mention i'm using mvc6.

depending on template used create app, if in app_start folder, there file called startup.auth.cs. code in there sets authentication. code default mvc template:

app.usecookieauthentication(new cookieauthenticationoptions {     authenticationtype = defaultauthenticationtypes.applicationcookie,     loginpath = new pathstring("/account/login"),     provider = new cookieauthenticationprovider     {         // enables application validate security stamp when user logs in.         // security feature used when change password or add          //external login account.           onvalidateidentity = securitystampvalidator             .onvalidateidentity<applicationusermanager, applicationuser>(                 validateinterval: timespan.fromminutes(30),                 regenerateidentity: (manager, user) => user                     .generateuseridentityasync(manager))     } });

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