如何强制Web浏览器缓存图片 [英] How to force a web browser to cache Images

问题描述

我写一个小的应用程序，它从本地计算机图像服务，使他们能够为 HTTP访问：//本地主机：12345 /东西/ 的东西（它返回一个JPEG）。

I am writing a small application which serves images from the local computer, so they can be accessed as http://localhost:12345/something/something (which returns a jpeg).

如何可以强制浏览器缓存此，因此只有一个单一的请求将被发送到服务器。将这个头就足够了。

How can I force the browser to cache this, so only a single request would be sent to the server. Would this header be sufficient

HTTP/1.1 200 OK
Cache-Control: public, max-age=99936000
Content-Length: 123456
Content-Type: image/jpeg

这似乎与3.X Firefox的工作，但它足以为全球浏览器等也？

This seems to work with Firefox 3.x but would it be sufficient globally for other browser as well?

推荐答案

一个修改和过期头也可能是有益的补充。

A Last-Modified and Expires header might also be useful additions.

您的服务器还应该检查设有一个如果-Modified-Since的头，并返回一个304未修改响应，如果可能的飞驰的东西。

Your server should also check for requests featuring an If-Modified-Since header, and return a 304 Not Modified response if possible to speed things along.

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