class Excon::Middleware::RedirectFollower

def response_call(datum)
  if datum.has_key?(:response) && [:get, :head].include?(datum[:method].to_s.downcase.to_sym)
    case datum[:response][:status]
    when 301, 302, 303, 307
      uri_parser = datum[:uri_parser] || Excon.defaults[:uri_parser]
      _, location = datum[:response][:headers].detect do |key, value|
        key.casecmp('Location') == 0
      end
      uri = uri_parser.parse(location)
      port_string = if datum[:omit_default_port] && ((uri.scheme.casecmp('http') == 0 && uri.port.to_i == 80) || (uri.scheme.casecmp('https') == 0 && uri.port.to_i == 443))
        ''
      else
        ':' << uri.port.to_s
      end
      # delete old/redirect response
      datum.delete(:response)
      response = datum[:connection].request(
        datum.merge!(
          :headers    => (datum[:headers] || {}).merge({'Host' => '' << uri.host << port_string}),
          :host       => uri.host,
          :path       => uri.path,
          :port       => uri.port,
          :query      => uri.query,
          :scheme     => uri.scheme,
          :user       => (URI.decode(uri.user) if uri.user),
          :password   => (URI.decode(uri.password) if uri.password)
        )
      )
      datum.merge!({:response => response.data})
    else
      @stack.response_call(datum)
    end
  else
    @stack.response_call(datum)
  end
end