rack-flash example.rb

require 'rack'
require 'rack-flash'

get = proc { |env|
  [200, {},
    env['x-rack.flash'].notice || 'No flash set. Try going to /set'
  ]
}

set = proc { |env|
  env['x-rack.flash'].notice = 'Hey, the flash was set!'
  [302, {'Location' => '/'},
    'You are being redirected.'
  ]
}

builder = Rack::Builder.new do
  use Rack::Session::Cookie
  use Rack::Flash, :accessorize => [:notice]

  map('/set') { run set }
  map('/')    { run get }
end

Rack::Handler::Mongrel.run builder, :Port => 9292