Feedburner 如何知道 RSS 源的订阅者数量？
Feedburner(http://feedburner.google.com) 提供有关订阅者和覆盖范围的 RSS Feed 的统计信息。这很有趣。
很容易理解，Feedburner 可以统计对 RSS 提要的访问（到达）。但是，Feedburner 如何了解 RSS 提要的订阅者。
根据我的理解，对 RSS Feed URI 的每个请求都是独立的。没有 cookie 或身份验证。那么，feedburner 如何知道 RSS 源有多少订阅者呢？
Feedburner(http://feedburner.google.com) provides statistics about RSS feed of subscribers and reaches. This is interesting.
It is easy to understand that Feedburner can count visits (reaches) to a RSS feed. But, how does Feedburner get to know subscribers to a RSS feed.
In my understanding, each requests to RSS Feed URI is independent. There are no cookies or identity validation. So, how does feedburner know how many subscribers to a RSS feed?
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最简单的部分是谷歌告诉它谷歌阅读器的数量，其他阅读器/聚合器也是如此。
对于轮询 RSS/Atom 提要的个人用户，请求中涉及 http 标头，因此可以通过 IP 地址跟踪用户，并且在代理后面时，许多代理在标头中包含原始 IP，这有助于在代理源之间进行排序。
如果做不到这一点，您可以阅读有关该主题的 FeedBurner 帮助。
The easy part is Google tell it the number of Google Readers, and so do the other Reader/Aggregators.
For individual users polling the RSS/Atom feed, there are http headers involved in the request, so users are tracked by IP address, and when behind proxies, a number of proxies include original IP in header, this helps sort between proxied sources.
Failing that you could read the FeedBurner help on that topic.
我想知道它是否知道任何事情。
--- 结束讽刺 ---
说真的，我博客的子号码会瞬间从大约 2k 跃升至大约 3k。
确定订户数量充其量是一门不精确的科学。
它确实依赖于其他服务的报告，有时这些服务会出现故障，或者会改变报告方式。
I wonder if it knows anything at all.
--- end sarcasm ---
Seriously, my sub numbers for my blog will jump from about 2k to about 3k at the drop of a hat.
Determining subscriber count is an inexact science at best.
It does rely on reporting from other services, and sometimes these services go down, or they change how they report.
像 FeedBurner 这样的服务实际上是博客提要的代理提要。因此，当您使用 FeedBurner（或类似工具）时，用户会订阅托管在 Google 服务器上、由您的 Feed 提供的 Feed。
因此，人们确实订阅了 Google 托管的提要，然后他们可以获得统计数据，就像您访问网站一样。
Services like FeedBurner are actualy a proxy feed to your blog's feed. So when you use FeedBurner (or alike) users subscribe to a feed hosted on Google's servers that is fed from your feed.
Thusly people are really subscribing to the feed hosted by Google and they can then get statistics just as if you were visiting a site.