View source for fat ping

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'''<dfn>fat ping</dfn>''' is a PuSH ping that contains a copy of the content that has been changed

=== Advantages ===
* Render once, send to all subs
* Hub can send the ping over a few seconds/minutes, to avoid hitting the main server with many requests for the changed content

=== Disadvantages ===
* More complex to implement
* For true security, needs signing of the content, see [https://superfeedr-misc.s3.amazonaws.com/pubsubhubbub-core-0.4.html#authednotify]