quick url shortner ruby

Following code can be used to Short urls in ruby or ruby on rails application.
I am using Google API for this.

require "rest_client"
require 'json'

# UrlShorther 
# Use it UrlShortner.shortner(link)
# It will return and sorted url "http://goo.gl/J4p9jd"

class UrlShortner
  def self.shortner(link)
    begin
     response = RestClient.post('https://www.googleapis.com/urlshortener/v1/url?key=GOOGLE_API_KEY', 
                {"longUrl" => link }.to_json, headers = {'Content-Type' => 'application/json'})
     response = JSON.parse response
     shortned_url = response["id"]
   rescue Exception => e
    e
   end
  end
end

Get this API KEY https://console.developers.google.com