class Shotgun::Loader

def proceed_as_parent
  @writer.close
  rand
  result, status, headers = Marshal.load(@reader)
  body = Body.new(@child, @reader)
  case result
  when :ok
    [status, headers, body]
  when :error
    error, backtrace = status, headers
    body.close
    [
      500,
      {'Content-Type'=>'text/html;charset=utf-8'},
      [format_error(error, backtrace)]
    ]
  else
    fail "unexpected response: #{result.inspect}"
  end
end