NET:HTTP headers ruby gem

I am trying to use the NET:HTTP gem to add an api-key to http header of
a client, but it just doesn't seem to be working for some reason when I
try and test it out.Basically the server requires the http header of the
client or anything to have http_x_api header in order to serve the
request.

Server code

   require 'sinatra'

   before do
     halt 400 if (env['API_KEY']) != 'wow'
  end

   get '/' do
     "boo"
   end

client code
    require 'net/http'
    require 'uri'

    port = ENV['PORT'] || '7474'

    res = Net::HTTP.start('localhost', port )  { |h| h.get('/')}
    res.add_field('api-key', 'wow')
    res.each_header do |key, value|
      p "#{key} => #{value}"
    end
    puts (res.code == '200' && res.body == 'boo') ? 'OK' : 'FAIL'

    this the response i get back :=>

   "x-frame-options => sameorigin"
   "x-xss-protection => 1; mode=block"
   "content-type => text/html;charset=utf-8"
   "content-length => 0"
   "connection => keep-alive"
   "server => thin 1.5.0 codename Knife"
   "api-key => wow"
    FAIL

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