Clarification for https://github.com/intridea/omniauth/issues#issue/229

auth_app.rb

# coding: utf-8

FB_APP_ID = 'insert_me'
FB_APP_SECRET = 'insert_me'

class AuthApp < Sinatra::Base
  use Rack::Session::Cookie

  use OmniAuth::Builder do
    provider :facebook, FB_APP_ID, FB_APP_SECRET
  end

  get '/hello' do
    "Hello !!"
  end
  
  get '/:name/callback' do
    auth = request.env['omniauth.auth']      
    auth.inspect
  end
    
  get '/failure' do
    "invalid"
  end
    
end

config.ru

#!/usr/bin/env ruby
# encoding: UTF-8

$LOAD_PATH.unshift File.dirname(__FILE__)

ENV['RACK_ENV'] ||= "development"
require 'bundler'
Bundler.setup
Bundler.require(:default, ENV['RACK_ENV'].to_sym)

require 'auth_app'

map "/blog" do
  run AuthApp.new
end