pubsubhubbub is a protocol, and, as such, does not depend on app engine. For example, superfeedr is another implementation of this protocol (I believe it's free for the first 1000 feeds, then something like 50 dollars a month for the next 1000 feeds, then decreasing gradually for even larger number of feeds).
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Denis Otkidach
On
Here is Django library implementing this protocol.
pubsubhubbub is a protocol, and, as such, does not depend on app engine. For example, superfeedr is another implementation of this protocol (I believe it's free for the first 1000 feeds, then something like 50 dollars a month for the next 1000 feeds, then decreasing gradually for even larger number of feeds).