How to take snapshot for a mobile website

take_snapshot_of_mobile_website.rb

=begin
** Install required packages
sudo apt-get install xvfb # fake X server
sudo apt-get install xfonts-base xfonts-75dpi xfonts-100dpi # fonts
sudo apt-get install iceweasel # this is firefox
=end

require 'headless'
require 'selenium-webdriver'
require 'webdriver-user-agent'

Headless.ly do
  driver = Webdriver::UserAgent.driver(:browser => :firefox, :agent => :iphone, :orientation => :portrait)
  driver.navigate.to 'http://google.com'
  puts driver.title
  driver.save_screenshot 'google.png'
  driver.quit
end

Headless.ly do
  driver = Webdriver::UserAgent.driver(:browser => :firefox, :agent => :iphone, :orientation => :portrait)
  driver.navigate.to 'http://baidu.com'
  puts driver.title
  driver.save_screenshot 'baidu.png'
  driver.quit
end