XMLHttpRequest:如何强制缓存? [英] XMLHttpRequest: How to force caching?

问题描述

由于我以前使用过jQuery的AjAX方法，因此我对XMLHttpRequests较新.但是，我需要在Web工作者中工作，现在我必须使用经典的XMLHttpRequest来解决性能问题.

I'm newer to XMLHttpRequests since I've previously used jQuery's AjAX method. However I need to work in a web worker and now I have to use the classic XMLHttpRequest for performance issues.

我正在尝试从jquery重建cache-属性.如果应该禁用缓存，请添加以下内容:

I'm trying to rebuild the cache-property from jquery. If cache should be disabled I add this:

xhr.setRequestHeader("Cache-Control", "no-cache");

但是如果我想强制缓存(不是阻止)，我应该设置什么标头?

But what header should I set if I want to force caching (not prevent)?

推荐答案

您可以设置多种标题来鼓励缓存，但是它们(包括您错误使用的Cache-Control)是响应标头，必须由服务器发送，而不是请求标头.

There are a variety of headers you can set to encourage caching, but they (including Cache-Control which you are using incorrectly) are response headers that must be sent by the server and not request headers.

使用Cache-Control的此类示例:

One such example of using Cache-Control:

Cache-Control: max-age=3600

此面向Web作者和网站管理员的缓存教程对其进行了更深入的介绍.

This Caching Tutorial for Web Authors and Webmasters covers them in more depth.

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