# File mod_docs/local.rb, line 382
  def publish_if_unmodified_since(stat, request, response)
    mtime = Time.parse(request.header('If-Unmodified-Since'))
    if (stat.mtime > mtime) then
      response.status = 412 # Precondition Failed
      response.start_body
      return true
    end

    false
  end