Ruby on Rails：如果是AJAX请求，如何将内容过期设置为15分钟

Is the following a good form of detecting AJAX request and setting expiration for 15 minutes so that the same GET will not require any network traffic?

以下是检测AJAX请求并设置15分钟到期的良好形式，以便相同的GET不需要任何网络流量吗？

# in controller
if request.xhr?
  response.headers['Expires'] = (Time.now + 15.minutes).httpdate
  response.headers['Cache-Control'] = ''   # override any no-cache, must-revalidate
end

Update: I found a shorter alternative, which is expires_in

更新：我找到了一个更短的替代品，即expires_in

# in controller
if request.xhr?
  expires_in(15.minutes)
end

although, after that, the header becomes:

虽然在那之后，标题变成：

Cache-Control: max-age=900, private

which used to be

曾经是

Expires: Tue, 13 Jul 2010 00:59:47 GMT

when it was the earlier version. But note that Cache-Control is for HTTP/1.1 and even a couple years ago, it was supported by 99% of the browsers, as mentioned in the High Performance Website book.

当它是早期版本。但请注意，Cache-Control适用于HTTP / 1.1，甚至几年前，99％的浏览器都支持它，如高性能网站书中所述。

1 个解决方案

#1

Ok, since there is no answer yet, I am going to use the one in the update above:

好的，因为还没有答案，我将使用上面更新中的那个：

if request.xhr?
  expires_in(15.minutes)
end

I tried it and it works well.

我试了一下，效果很好。

#1