资源 URL 中的 ETag 或哈希值，例如。 js、css、图像
我想确保每次更改 Web 应用程序中的资源（css、js 和图像）时都会刷新它们，并保留相同的资源名称（这样我就不需要更改 html 中对其的引用）。所以我想至少有两个明显的解决方案：
- 在响应标头中包含 ETAG
- 在 Url 中包含哈希（即 /css/{hash}/style.css）
我更喜欢第二个想法，因为也许一些较旧的代理或浏览器会忽略 etag - 是这样吗？但在 css 中将哈希值放入图像的 url 中要困难一些。所以最后我想我会选择图像的第一个选项，以及 css 和 js 的第一个和第二个选项。
你有什么想法？首先就足够了，如果资源发生变化，每个相当现代的软件都会请求刷新资源。
I want to make sure resources in web application (css, js, and images) will be refreshed every time I change them leaving the same name of the resource (so that I dont need to change references in html to it). So I guess there are at least two obvious solutions:
- Include ETAG in the response header
- Include Hash in Url (ie /css/{hash}/style.css)
I liked second idea better, because maybe some older proxies or browser would ignore etag - is that right ? But it is bit more difficult to put hashes into url of images in css. So finally I guess I will go with the first option for images, and both the first and the second for css and js.
What are your thougts ? Would first just be enough, and every fairly modern software will request refresh of the resource if it will change.
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关于第二个，您可以使用 Apache 重写规则来完成此任务。我假设您可以使用您使用的任何编程语言对文件的修改/创建日期进行哈希处理。
.htaccess
RewriteEngine 开启
重写库 /
RewriteRule ^css/[^/]+/style.css$ css/style.css [L]
Concerning the second, you could use a Apache Rewrite Rule to accomplish that. I assume you could hash the date modified/created of the file with whatever programming language you are using.
.htaccess
RewriteEngine on
RewriteBase /
RewriteRule ^css/[^/]+/style.css$ css/style.css [L]
根据我的经验，浏览器/代理通常会尊重 etag。不过，我通常发现我还需要设置上次修改时间。还要确保您的 etag 格式正确，因为某些浏览器对此很挑剔。
From my experience an etag is usually respected by browsers/proxies. However I've generally found that I've needed to set the last modified also. Also make sure that you have the etag formed correctly as some browsers are picky about that.