Redirect to S3 file

Gemfile

@@ -3,6 +3,6 @@ source 'https://rubygems.org'
 ruby '2.2.2' if ENV.key?('DYNO')
 
 gem 'aws-sdk', '~> 2'
-gem 'puma'
 gem 'pry', group: [:development, :test]
-gem 'sinatra'
+gem 'puma'
+gem 'rack'

Gemfile.lock

@@ -18,14 +18,7 @@ GEM
       slop (~> 3.4)
     puma (2.13.4)
     rack (1.6.4)
-    rack-protection (1.5.3)
-      rack
-    sinatra (1.4.6)
-      rack (~> 1.4)
-      rack-protection (~> 1.4)
-      tilt (>= 1.3, < 3)
     slop (3.6.0)
-    tilt (2.0.1)
 
 PLATFORMS
   ruby
@@ -34,7 +27,7 @@ DEPENDENCIES
   aws-sdk (~> 2)
   pry
   puma
-  sinatra
+  rack
 
 BUNDLED WITH
    1.10.6

app.rb

@@ -1,21 +0,0 @@
-require 'sinatra/base'
-require_relative 'cpi_fetcher'
-
-class App < Sinatra::Base
-  get '/' do
-    current_cpi = fetcher.cpi
-    halt 502 unless current_cpi
-
-    expires 300, :public, :must_revalidate
-    content_type :text
-    "#{current_cpi}\n"
-  end
-
-  run! if app_file == $PROGRAM_FILE
-
-  private
-
-  def fetcher
-    @fetcher ||= CPIFetcher.new
-  end
-end

config.ru

@@ -1,3 +1 @@
-require './app'
-
-run App
+run lambda { |env| [301, { 'Location' => ENV['CPI_FEED_URL'] }, []] }