anchor.diff:    if Request.Params.Values['submit'] = 'Logout' then
     begin
       Request.Session.Free;
  -    Response.Redirect('login');
  +    Response.Redirect(Request.Document);
       Exit;
     end;
   
  
positive.code:     + '  </head>' + #13
      + '  <body>' + #13
      + '    <p>you are logged in</p>' + #13
      + '     <form method="post">' + #13
      + '     <input type="submit" name="submit" value="Logout">' + #13
      + '    </form>' + #13
      + '  </body>' + #13
  
negative.code:     + '    <title>Form based login example</title>' + #13
      + '  </head>' + #13
      + '  <body>' + #13
      + '    <form method="post">' + #13
      + '     <input type="text" name="username" required>' +#13
      + '     <input type="password" name="password" required>' + #13
      + '     <input type="submit" name="submit" value="Login">' + #13
  