How to get more Feed items?

How would I get the next page or more results for a 开发者_Go百科feed?

For example, when I go to Security Now feed page, there is no "next" link of any kind and the url parameter of "page=100" does nothing:

http://leoville.tv/podcasts/sn.xml

I get only 1 page of results of about 20 episodes. However my Google Reader can successfully retrieve episodes that are earlier than that.

Indeed it is true that Google Reader caches the items and it is NOT possible to paginate on RSS2, RSS or Atom feeds (unless they have rel=next link, which none of them seem to have).

However, we can leverage the existing Google Reader infrastructure, with some work, to retrieve a list of, say 200 items!

Given the above podcast url we retrieve the latest 200 episodes by:

1. Using the ...google.ca/reader/atom/feed prefix instead of the usual view/feed as can be seen in your google reader.
2. Appending n=200 as the query parameter.

So we have:

http://www.google.ca/reader/atom/feed/http://leoville.tv/podcasts/sn.xml?hl=en&n=200

There is a very insightful reverse-engineered google-reader API project located at http://code.google.com/p/pyrfeed/wiki/GoogleReaderAPI

Google reader caches RSS entries. You can't get any more from the actual feed if they don't allow for it.