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Open https webpage in ruby.

i am try to open https link in ruby program. http links are opening by using open(url) but when i am trying to use the same command for https urls it gives me error. following is my code. I want open first url but if there is a problem in it then the second url should be opened.

require 'rubygems'
require 'sinatra'
require 'json'
require 'open-uri'
#require 'net/http'
require 'net/https'
require 'rest-client'
require 'nokogiri'

set :environment, :production

get '/' do

  uri = ("https://url")

  url2 = "http://slashdot.org/"

       redirect (uri)
    doc = open(url2)