HTTP fetch breaks

gistfile1.rb

require 'uri'
require 'net/http'

# From http://ruby-doc.org/stdlib-1.9.3/libdoc/net/http/rdoc/Net/HTTP.html#method-c-get_response
# Does not fully work!
def fetch(uri_str, limit = 10)
  # You should choose a better exception.
  raise ArgumentError, 'too many HTTP redirects' if limit == 0

  response = Net::HTTP.get_response(URI(uri_str))

  case response
  when Net::HTTPSuccess then
    response
  when Net::HTTPRedirection then
    location = response['location']
    puts "redirected to #{location}"
    fetch(location, limit - 1)
  else
    response.value
  end
end

response_1 = fetch "http://www.facebook.com" #Works fine
puts response_1.inspect

response_2 = fetch "http://apps.facebook.com/pickoffgame" #Explodes
puts response_2.inspect