# File lib/sinatra/async.rb, line 164
      def async_handle_exception
        yield
      rescue ::Exception => boom
        if settings.show_exceptions?
          printer = Sinatra::ShowExceptions.new(proc{ raise boom })
          s, h, b = printer.call(request.env)
          response.status = s
          response.headers.replace(h)
          response.body = b
          body(response.body)
        else
          body(handle_exception!(boom))
        end
      end