如何检测客户端是否关闭了rails 4.2上的连接

class MyController < ActionController::Base
  include ActionController::Live

  def stream
    response.headers['Content-Type'] = 'text/event-stream'
    sse = SSE.new(response.stream)
    
    begin
      loop do
        # 检测客户端连接是否关闭
        unless response.stream.closed?
          # 执行相应的操作
          sse.write("Data")
          sleep 1
        else
          break
        end
      end
    rescue IOError
      # 客户端连接已关闭
    ensure
      sse.close
    end
  end
end

class MyController < ActionController::Base
  def heartbeat
    # 处理心跳请求
  end
end

setInterval(function() {
  // 发送心跳请求
  $.ajax({
    url: '/heartbeat',
    method: 'GET'
  });
}, 5000); // 每5秒发送一次心跳请求