Hi there, I set up a subscription with https://pubsubhubbub.appspot.com/ and successfully confirmed it asynchronously. After that, however, the hub didn't seem to be pulling content from the topic URL or pushing it to the subscriber. Further testing showed that sync subscriptions always work, but async subscriptions never work.
So I tried setting up my own hub using the source code at r402, and traced what happened. It looks like, in order for a hub ping to result in a check for new content, a KnownFeedIdentity entity must exist for the topic URL (see main.py line 2258, in PublishHandlerBase.receive_publish). The KnownFeedIdentity is created by the RecordFeedHandler (main.py line 3034, in RecordFeedHandler.post), which is triggered by KnownFeed.record (main.py line 1980, in confirm_subscription). confirm_subscription() only records the new topic if its record_topic flag is set to True. This flag is True for sync subscriptions (line 2071 in SubscribeHandler.post) but False for async subscriptions (line 2119 in SubscriptionConfirmHandler.post). Sure enough, if I change False to True on line 2122, then async subscriptions work. So, is this a bug? It's clearly intentional that record_topic was set to False, but why is that? Thanks for any insight on this, —Ping
