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require 'rubygems' require 'sinatra' require 'json' configure do enable :sessions end get '/' do headers['Cache-Control'] = 'max-age=60, must-revalidate' PAGE end get '/userinfo' do if session[:user] JSON.dump(:user => session[:user]) else halt 401 end end get '/login' do session[:user] = 'rock' redirect '/' end get '/logout' do session.clear redirect '/' end PAGE = %( <html> <head> <title>Hi</title> <script src='http://www.scramble.com/javascripts/jquery-1.3.1.js'></script> <script> $(function() { $.getJSON('/userinfo', function(data) { $('h1').text('Hi ' + data.user); $('#nav .login-control').attr('href', '/logout').html('logout'); }) }) </script> </head> <body> <h1>Hi</h1> <div id="nav"> <a href="/login" class='login-control'>Login</a> </div> <p>Non session specific content</p> </body> </html> )