Error making http request in ruby on rails

Question

I am trying to make an http request to send and sms through kannel using ruby but its not working,what could be the problem with the code in this method. Thanx

require 'net/http'

 def self.send_sms( to, from, message)
   id = rand(36**8).to_s(36)
   uri= URI('http://localhost:13013/cgi-bin/sendsms?')
   params = {username: 'skylinesms', password: 'password', from: '#{from}', 
             text: '#{message}', 
             'dlr-url': '#{Rails.application.routes.url_helpers.deliver_url(:id => id)}',
             'dlr-mask': 3
            }
   uri.query = URI.encode_www_form(params)
   req = Net::HTTP::Get.new(uri.to_s)
   res = Net::HTTP.get_response(uri)
   res
 end