缓存AJAX请求 [英] Cache AJAX requests

问题描述

我发送Ajax GET-请求到PHP应用程序，并想缓存请求返回，供以后使用。

I am sending AJAX GET-requests to a PHP application and would like to cache the request returns for later use.

由于我使用GET这应该是可能的，因为不同的请求，要求不同的URL（如getHTML.php？页= 2，getHTML.php？页= 5）。

Since I am using GET this should be possible because different requests request different URLs (e.g. getHTML.php?page=2 and getHTML.php?page=5).

我需要在PHP应用程序，使用户的浏览器缓存以适当的方式请求URL的内容要申报什么头？我需要声明Javascript代码中任何事情处理AJAX请求（我使用jQuery的$就功能具有高速缓存参数）？

What headers do I need to declare in the PHP-application to make the clients browser cache the request URL content in a proper way? Do I need to declare anything in the Javascript which handles the AJAX-request (I am using jQuery's $.ajax function which has a cache parameter)?

我将如何处理其中的编辑，例如更改的内容getHTML.php？页= 2，这样客户端不回落到缓存的版本？ 添加另一个参数的GET请求如getHTML.php页= 2及？因为链接请求的URL没有任何检查自动创建（这是preferably我希望它的方式）版本= 2是不可能的。

How would I handle edits which change the content of e.g. getHTML.php?page=2 so that the client doesn't fall back to the cached version? Adding another parameter to the GET request e.g. getHTML.php?page=2&version=2 is not possible because the link to the requested URL is created automatically without any checking (which is preferably the way I want it to be).

如何将浏览器反应过来的时候我尝试AJAX请求缓存请求URL？请问AJAX请求返回成功立刻？

How will the browser react when I try to AJAX-request a cached request URL? Will the AJAX-request return success immediately?

感谢

威廉

推荐答案

添加下列头的服务器上：

Add the following headers on the server:

    header("Cache-Control: private, max-age=$seconds");
    header("Expires: ".gmdate('r', time()+$seconds));

其中的 $秒也有一个明显的意义。

Where $seconds has an obvious meaning.

此外，检查您的服务器不发出类似语用其他一些反缓存头。如果是的话，加上杂注：高速缓存头太

Also, check if your server do not issue some other anti-caching headers like Pragma. If so, add "Pragma: cache" header too.

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