title: Anti forgery token on login page
body: <p>I have implemented antiforgery token on my login page.</p>
  
  <p>Now I had one user pressing back key on the keyboard, 
  and when they click on login button again after filling their credentials, they get error page.</p>
  
  <blockquote>
    <p>Is there some better way of handeling this case like redirect them to
    fresh login page?</p>
  </blockquote>
  
  <p>Page that is login page is :<strong>/account/logon</strong><br></p>
  
  <p>If login details are sucessfull the user is redirected to :Home/Index page
  on which the user pressed button back.</p>