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Running a feed reader is an interesting business. One of the more interesting problems I have seen is this “DoS” from Google’s WebSub Hub.This is a graph of WebSub pings for a single feed, The Chromium Blog. This blog appears to be powered by Blogger.This isn’t a ton of traffic, the peaks hover around one request every 10 s. However, it adds up when the bursts run for days.The number of entries in the ping varies and is bimodal. It is usually around 20 (Blogger appears to keep 25 items in the fe...