display web image in GTK

require 'gtk3'
require 'RMagick'
require 'open-uri'

class RubyApp < Gtk::Window

  def initialize
    super
    
    set_title "Privat"
    signal_connect "destroy" do 
      Gtk.main_quit end
      
    set_default_size 300, 200
    
    set_window_position Gtk::Window::Position::CENTER 
 
   image = Magick::ImageList.new  
    urlimage = open("http://rmagick.rubyforge.org/framed_clown.jpg")
    image.from_blob(urlimage.read)

    posh = Gdk::Pixbuf.new :data => image.to_blob
    gtkimage = Gtk::Image.new :pixbuf => posh
    add gtkimage
    show_all
  end
end

Gtk.init
  window = RubyApp.new
Gtk.main