HTTP ETag 复制
最近发现与 HTTP ETag 和我们的 CDN 我尝试在 Fiddler 中捕获一些知名网站的内容。然而，无论我使用哪种浏览器/网站组合，我都没有看到任何经过。
这有什么原因吗？您能建议我可以看到它们的组合吗？也许它们不再被广泛使用？
Having recently discovered problems relating to the HTTP ETag and our CDN I've tried to capture some in Fiddler for well known sites. However it appears that whatever combination of browser / website I use I'm not seeing any pass by.
Is there any reason for this? Can you suggest a combination in which I can see them? Perhaps they're not widely used anymore?
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它们肯定被广泛使用，我自己也经常使用它。最常见的用例是条件请求（始终检查是否有新内容，但仅在内容发生更改时才从服务器发回内容）。
但是，Last-Modified 也可以执行此操作，如果您不强制浏览器始终检查新内容（无需重新验证），则不需要它。
您的 CDN 不使用它们的原因是以下之一：
They are definitely widely used, I've used it myself often. The most common usecase is conditional requests (always check if there's new content, but only send the content back from the server if it has changed).
However, Last-Modified can also do this instead and it's not needed if you don't force the browser to always check for new content (no must-revalidate).
The reason your CDN isn't using them is one of the following: