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SUP, a Format to Tell Which Feeds Updated  (View post)

Matthew Claypotch [PersonRank 1]

Thursday, August 28, 2008
11 years ago2,902 views

But how will we know which SUP feeds have updated? (radar detector detector detector). Seriously though, this is a pretty nifty idea.

Eugene Villar [PersonRank 5]

11 years ago #

The important advantage I see here is the reduction of bandwidth but at the expense of additional complexity.

Marcin Sochacki (Wanted) [PersonRank 10]

11 years ago #

If RSS readers and servers implement If-Modified-Since and 304 return codes HTTP standard, bandwidth shouldn't be such a problem. Why invent a new wheel?

en.wikipedia.org/wiki/List_of_ ...

Philipp Lenssen [PersonRank 10]

11 years ago #

Marcin, check out the update Paul added to the blog:

<<Update: Several people have asked how using SUP compares with using HTTP If-Modified-Since headers. The two features are complementary. With SUP, feed consumers can monitor thousands of feeds with a single HTTP request (to fetch the latest SUP document) instead of having to request each feed individually. For example, each user's feed on FriendFeed has a unique SUP-ID (mine is "53924729"), but all of the feeds point to a single SUP URL, friendfeed.com/api/sup.json. Therefore, it's possible to watch for activity on thousands of separate FriendFeed URLs by polling just one URL, friendfeed.com/api/sup.json. If my SUP-ID appears in that SUP document, then you know that my feed has updated and it's time to fetch a new copy. This is substantially more efficient than polling each of those thousands of URLs individually.>>
blog.friendfeed.com/2008/08/si ...

Eugene Villar [PersonRank 5]

11 years ago #

I completely forgot about the caching properties of HTTP. I guess this would only be valuable for services that poll a heckuva lot of feeds (e.g., Bloglines and Google Reader) from sites that push a heckuva lot of feeds (e.g., FeedBurner and FriendFeed). For other cases, I don't think SUP is worth the effort.

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