# File lib_doc/rucy/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