Let's take for example the following rss-link: http://yourdailygerman.wordpress.com/feed/
As you can see, the RSS publishs only 1 item at a time.
However, RSS Readers services like Feedly (and more), success to retrive more items: http://feedly.com/index.html#subscription%2Ffeed%2Fhttp%3A%2F%2Fyourdailygerman.wordpress.com%2Ffeed%2F
I opened fiddler and I saw they have their own API (following "count" paramter as the items count to get), and I wonder - How they do that???
Thanks!
You can't get more item from a feed if it's the first time you fetch it... however (and this is what Feedly does!), you can store the content of today, so that when new items are added tomorrow, you have the items from today and tomorrow... etc. Eventually you'll have enough data!
来源：https://stackoverflow.com/questions/24110170/how-to-get-more-feeds-from-rss-url