Puma "reverse proxy" debugging wackiness

config.ru

# puma -p 31337 -q

require 'net/http'

run Proc.new { |env|
  uri = URI('http://127.0.0.1:80/')

  response = nil

  Net::HTTP.start(uri.host, uri.port) do |http|
    client_req = Net::HTTP::Get.new uri
    response = http.request(client_req).body
  end

  ['200', {'Content-Type' => 'text/html'}, [response]]
}