Just learning about this via youtube but could not find answer to my question of how reader knows there is an update.
Is it like a Push in blackberry?
A:
It's a pull. That's why you have to configure your reader how often it should refresh the feed.
Peter Schuetze
2009-12-29 16:22:17
+2
A:
RSS is a pull technology. The reader re-fetches the RSS feed now and then (for example two times per hour, or more often if the reader learns that it's an often updated feed).
The feed is served through regular HTTP and consists of a simple XML file.
Emil Vikström
2009-12-29 16:22:23
The question was how does the reader know that there's an update? Does it continuously read the same feeds? How does it know there's an update and not reload what already seen?
Helen Neely
2010-02-13 21:38:52
+1
A:
It just check the feed for update regularly.
Recently there is a new protocol called pubsubhubbub to make feed push to the listener. But it requires the publishers support it.
Here is a list of web services support real-time RSS pushing, including Google Reader, Blogger, FeedBurner, FriendFeed, MySpace, etc.
Iamamac
2009-12-29 16:25:47
A:
I recommend this for a full description of RSS as well: (its only a brief article, its actually a suprisingly simple mechanism...I guess I shouldn't have been suprised since one of those S's is for 'Simple' though...)
monojohnny
2009-12-29 16:28:53