MVC form authentication and Web API Authentication by IPrinicipal

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C#

ASP.NET

MVC

C#5.0

ASP.NET4

MVC5

Dear All,

I found one of nice solution regarding MVC form authentication, and implement it in application.
MVC form authentication implementation can be got from below URL

Custom-Authentication-and-Authorization-in-ASP.NET-MVC


Although its done, Now I need this implementation for WEB API also. Can any one provide possible solution for WEB api

Second I have 2 questions about this implementation.

1. As user authentication is maintained in cookies, so what if cookies are disabled by user?
2. As i see, I logout from application, but still when i navigate back by browser navigation, it still shows previous page, instead to navigate to login/access denied. Although performing some operation on such page, will authenticate and navigate to login page. But still i want if user is logout, then there should no way to navigate back. So what should i do for this.

Thanks in Advance