Getting 401 response when connecting to Google via OAuth2, Ruby

Question

I'm trying to access all the contacts from Google Contacts for invite purposes from my site. So I'm using OAuth2 but when I first request I get a 401 error with access_token. :(

Keep in mind I'm working local!!

Here's my code.

 def authenticate
      # initiate authentication w/ gmail
      # create url with url-encoded params to initiate connection with contacts api
      # next - The URL of the page that Google should redirect the user to after authentication.
      # scope - Indicates that the application is requesting a token to access contacts feeds.
      # secure - Indicates whether the client is requesting a secure token.
      # session - Indicates whether the token returned can be exchanged for a multi-use (session) token.
      next_param = "http://localhost:3000/import/authorise" 
      scope_param = "https://www.google.com/m8/feeds/"  
      #session_param = "1"
      state="profile"
      client_id="535946964206.apps.googleusercontent.com"
      root_url = "https://accounts.google.com/o/oauth2/auth"
      response_type="token"
      #TO FIND MORE ABOUT THESE PARAMETERS AND THERE MEANING SEE GOOGLE API DOCS.
      query_string = "?scope=#{scope_param}&state=#{state}&redirect_uri=#{next_param}&response_type=#{response_type}&client_id=#{client_id}"

      #render :text=> root_url + query_string and return
    #  redirect_to "https://accounts.google.com/o/oauth2/auth?
    #scope=https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.email+https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.profile&
    #state=%2Fprofile&
    #redirect_uri=http://localhost:3000/import/authorise&
    #response_type=token&
    #client_id=535946964206.apps.googleusercontent.com
    #"
      redirect_to root_url + query_string
    end

this is for authentication now i get response with access token

http://localhost:3000/import/authorise#state=profile&access_token=ya29.1.AADtN_WPohnlKYBH16kFrqEcYUTZ558WDICpqCqiz1mwBKESFr5PTiJFA5vsyoc&token_type=Bearer&expires_in=3600

Now next it will redirected to here,this is where i get above error

# YOU WILL BE REDIRECTED TO THIS ACTION AFTER COMPLETION OF AUTHENTICATION PROCESS WITH TEMPORARY SINGLE USE AUTH TOKEN.
def authorise
  #FIRST SINGEL USE TOKEN WILL BE RECEIVED HERE..
  token = params[:token]


  #PREPAIRING FOR SECOND REQUEST WITH AUTH TOKEN IN HEADER.. WHICH WILL BE EXCHANED FOR PERMANENT AUTH TOKEN.
  uri = URI.parse("https://www.google.com")
  http = Net::HTTP.new(uri.host, uri.port)
  http.use_ssl = true
  http.verify_mode = OpenSSL::SSL::VERIFY_NONE
  path = '/accounts/AuthSubSessionToken'
  headers = {'Authorization' => "AuthSub token=#{token}"}

  render :text=> http.get(path, headers) and return
  #GET REQUEST ON URI WITH SPECIFIED PATH...
  resp, data = http.get(path, headers)

  #ender :text=> data and return
  resp.code="200"
  #SPLIT OUT TOKEN FROM RESPONSE DATA.
  if resp.code == "200"
    token = ''
    data.split.each do |str|
    if not(str =~ /Token=/).nil?
      token = str.gsub(/Token=/, '')
    end
  end


return redirect_to(:action => 'import', :token => token)
else
redirect_to root_url , :notice => "fail"
end
end

here at above function when it requests resp, data = http.get(path, headers) the responce resp.code is 401 . i dont know what's wrong i'm following https://gist.github.com/miketucker/852849 example which uses AuthSub which is now not in use so i'm adapting oauth2 . i already have made app at clode console and given return url and other info.

any help or point me to other working example,thanks you!!! thank you.