#pubsubhubbub

Simply Best Practices for Web Blog’s XML Sitemaps & RSS/Atom feeds

Simply Best practices for Web Blog’s XML Sitemaps & RSS/Atom feeds

Simply Best practices for Web Blog’s XML Sitemaps & RSS/Atom feeds

Submitting sitemaps can be an important part of optimizing websites. Sitemaps enable search engines to discover all pages on a site and to download them quickly when they change. This blog post explains which fields in sitemaps are important, when to use XML…

Pushing Content Faster with PubSubHubbub

If you want to let your own script subscribe to Posterous directly via PubSubHubbub (powered by Superfeedr, but in this instance not going through their dashboard), here's an example.

$ curl -vd 'hub.mode=subscribe&hub.verify=sync&hub.callback= http%3A%2F%2Fcharlvn.za.net%2Fsomescript.php&hub.topic= http%3A%2F%2Fp.charlvn.com%2Frss.xml' http://posterous. superfeedr.com

In the above, http://charlvn.za.net/somescript.php would be my script (which has to be set up first) and http://p.charlvn.com/rss.xml is the Posterous feed I'm trying to subscribe to.

If you receive a HTTP/1.1 204 No Content response, you should be fine.

Now, somescript.php could be something like this:

<?php  if (isset($_REQUEST['hub_challenge'])) {  echo $_REQUEST['hub_challenge']; } else { $document = new DOMDocument(); $document->load('php://input');     $xpath = new DOMXPath($document);     $xpath->registerNamespace('atom', 'http://www.w3.org/2005/Atom');     $status = $xpath->evaluate('string(//atom:entry/atom:title)'); if (trim($status)) { $uri = 'http://charlvn:[email protected]/statuses/update.xml? status=' . urlencode($status);   $context = stream_context_create(array('http'=>array ('method'=>'POST'))); file_get_contents($uri, 0, $context);} }

You might notice here that even though the original feed is in RSS format, the code that gets pushed to you is in Atom.

Always blindly accepting the hub_challenge is maybe not a good idea. However, not much harm done as long as you keep the URL of the script secret.

It's really easy to become a PubSubHubbub publisher if you pick an open hub like pubsubhubbub.appspot.com.

Firstly, you need to make sure the subscribers to your feed know which hub you are notifying. You just need to link to the hub in your Atom feed as follows:

<link rel="hub" href="http://pubsubhubbub.appspot.com/"/>

Then, as soon as you publish a new post, you need to notify the hub to let it check your feed. Here is an example of how you could do that using PHP.

$feed = 'http://web4that.com/rss'; $hub = 'http://pubsubhubbub.appspot.com/'; $params = array('hub.mode' => 'publish', 'hub.url' => $feed); $curl = curl_init(); curl_setopt($curl, CURLOPT_URL, $hub); curl_setopt($curl, CURLOPT_POSTFIELDS, $params); curl_setopt($curl, CURLOPT_RETURNTRANSFER, true); curl_exec($curl); curl_close($curl);

Pubsubhubbub(パブサブハバブ)の公式サイトは以下。 https://code.google.com/p/pubsubhubbub/ 以下はその概要で訳してみた。

Recently I added PubSubHubbub support to my site. It's pretty simple to add, so I thought i'd share it here.

PubSubHubbub is a pub/sub model for the internet. e.g. publishers can update their feeds and then inform a central hub. Subscribers register with the hub and get pinged whenever the published has posted new data. For a more thorough explanation, refer the PubSubHubbub  site.

I will explain how to add support for a rss feed.

Step 1:

You first need to find a hub (or maybe host your own) I used the hub at Superfeedr. Once you register, you will receive your hub url, something like: mydomain.superfeedr.com

Step 2:

You need to augment your rss feed with the url of the hub the publisher will ping once new data appears. For good measure, also add it to the response headers. Here's what I added to my rss feed:

<!-- PubSubHubbub Discovery --> <link rel="hub" href="https://{{ meta.hub }}" xmlns="http://www.w3.org/2005/Atom" /> <link rel="self" href="{{ meta.self }}" xmlns="http://www.w3.org/2005/Atom" /> <!-- End Of PubSubHubbub Discovery -->

Here's how I added new headers (assuming a node/express type framework):

res.links({hub: cfg.hub, self: cfg.transportRequire + '://' + cfg.apiHost + '/feeds/rss2' });

Thus, the first time anyone accesses the feed, the links in the feed (or alternatively in the header), will inform them that the pubsubhubbub protocol is supported and the client can register with the hub url specified in order to get updates.

Step 3:

Subscribe with the hub and provide an appropriate callback to be called each time the publisher updates it's feed.

Step 4:

The publisher needs to ping the hub any time it's feed is updated. Here is a sample gist of a function written in javascript to achieve that.

PuSH is great because instead of downloading the entire feed over and over again, PuSH sends new content to Feedbin making it so articles show up right after they are published. Feedbin already has thousands of articles getting pushed every hour.

Das ist doch schon fast erstaunlich. Ich meine, sie hätten es auch einstellen können, ohne dass es irgendjemanden völlig überrascht hätte.

Nein, nein, das ist gut. Doch. :)