One File Web Page with Rack

.rvmrc

rvm 1.9.2@rack-examples --create

Gemfile

source :gemcutter
gem 'haml'
gem 'rack'

Gemfile.lock

GEM
  remote: http://rubygems.org/
  specs:
    haml (3.0.25)
    rack (1.2.2)

PLATFORMS
  ruby

DEPENDENCIES
  haml
  rack

hello1.ru

message = "Hello world"
headers = {"Content-Length" => "#{message.length}",
           "Content-Type" => 'text/html'}
status = 200 
run lambda {[status, headers, [message]]}

hello2.ru

message = "Hello world"
status = 200

use Rack::ContentLength
use Rack::ContentType

run lambda {[status, {}, [message]]}

hello3.ru

require 'erb'

status = 200 
home_view = <<VIEW
  Hello world
VIEW
rendered_view = ERB.new(home_view).result

use Rack::ContentLength
use Rack::ContentType

run lambda {[status, {}, [rendered_view]]}

hello4.ru

require 'haml'

status = 200 
home_view = <<VIEW
!!!
%html
  %head
    %title= title
  %body
    = message
VIEW
rendered_view = Haml::Engine.new(home_view).render Object.new,
  {:message => 'Hello world', :title => 'A hello world page'}

use Rack::ContentLength
use Rack::ContentType

run lambda {[status, {}, [rendered_view]]}