要求浏览器缓存尽最大可能地 [英] Asking browsers to cache as aggressively as possible
问题描述
这是关于一个Web应用程序供应的图像。由于相同的请求将总是返回相同的形象，我想访问浏览器尽最大可能地缓存图像。我pretty多想告诉浏览器
This is about a web app that serves images. Since the same request will always return the same image, I want the accessing browsers to cache the images as aggressively as possible. I pretty much want to tell the browser
这是你的形象。继续前进，保持它;它真的不会改变在未来几天。无需回来。真。我答应了。
Here's your image. Go ahead and keep it; it's really not going to change for the next couple of days. No need to come back. Really. I promise.
我做的，到目前为止，集
I do, so far, set
Cache-Control: public, max-age=86400
Last-Modified: (some time ago)
Expires: (two days from now)当然返回 304不修改如果要求有相应的的If-Modified-Since的头。
and of course return a 304 not modified if the request has the appropriate If-Modified-Since header.
还有什么我可以做（或什么我应该做不同），以获得我的信息传达给浏览器？
Is there anything else I can do (or anything I should do differently) to get my message across to the browsers?
该应用程序托管在谷歌应用程序引擎，在这种情况下，重要的
The app is hosted on the Google App Engine, in case that matters.
推荐答案
您可能有兴趣在检查出以下谷歌code文章：
You may be interested in checking out the following Google Code article:
- Optimize caching: Leverage browser caching
在简单地说，所有现代浏览器应该能够适当地缓存图像的指示，与HTTP标头。
In a nutshell, all modern browsers should be able to cache your images appropriately as instructed, with those HTTP headers.
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