我如何知道有多少人订阅了我正在提供的 RSS 源？
我们有一个网站提供一些 RSS 提要，我们想知道有多少人订阅了每个提要，而不使用像 FeedBurner 这样的系统来为他们提供服务。
解决这个问题的原始方法基本上是记录请求，然后获取请求每个 feed 的唯一 IP 的数量。但是，例如，如果我有 100 万人通过 Google Reader 订阅，那么我只会从 Google 收到针对所有订阅者的 1 个请求，对吧？
有办法解决这个问题吗？
FeedBurner 本身如何解决这个问题？
现在作为 Google 的财产，它肯定可以查出有多少人订阅了 GReader 中的某个提要，但我确信还有其他在线 RSS 提要会带来同样的问题。
有什么想法吗？
We have a site that is serving some RSS feeds, and we'd like to know how many people is subscribed to each one, without using a system like FeedBurner to serve them.
The original approach to figuring this out was basically logging requests, and then getting the number of unique IP's that had requested each feed. However, if I get 1 million people subscribing through Google Reader, for example, then I'm only going to get 1 request from Google for all the subscribers, right?
Is there a way around this?
How does FeedBurner itself work around it?
Being Google's property now, it can surely find out how many people are subscribed to a certain feed in GReader specifically, but I'm sure there are other online RSS feeds that would pose the same problems.
Any ideas?
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这并不能回答您的全部问题，但是当 Google 阅读器抓取您的 Feed 时，它会在用户代理中向您公开通过 Google 阅读器订阅的人数：
http://www.google.com/support/reader/bin/answer.py?hl= en&answer=70001
This doesn't answer your entire question, but when Google Reader crawls your feed, it will expose to you, in the User-Agent, the number of people subscribed via Google Reader:
http://www.google.com/support/reader/bin/answer.py?hl=en&answer=70001