June 2010
Beginner
320 pages
9h 37m
English
Content preview from Building the Realtime User ExperienceBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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PubSubHubbub
PubSubHubbub differs from the rest of the implementations because it is a fully push-based protocol. All of the content between publishers and subscribers runs through centralized hubs, but this protocol is completely decentralized, open source, and free. Anybody can run a hub and publish and subscribe to content. There is no single entity in control of this system. However, this is a server to server protocol and requires public-facing servers end-to-end. So although this protocol isn’t used directly by end users, it makes it possible for end users to get almost instantaneous updates from the publishers.
In the PubSubHubbub workflow, a publisher specifies a hub server in the RSS or Atom feed. Every time a publisher adds or updates content, it pings the hub to announce that the feed has been updated. After receiving the ping, the hub checks the updated RSS file for differences and sends them via POST request to any subscriber that has requested it. During the subscription process, each client specifies a callback URL, and it’s this URL that the hub POSTs to as new data arrives.
The Protocol
As the name suggests, the PubSubHubbub protocol has two major components: publication and subscription.
Subscribe
The Sub part of PubSubHubbub is subscription. When your main goal is to collect aggregated content from around the Web in real time, this is the most important part. It’s a bit different from subscribing to RSS feeds because it involves two servers, and instead of you pinging ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.