pubsubhubbub - What is the difference between sync and async when sucribing to a feed?

Question

I am trying to implement pubsubhubbub as a subscriber to https://pubsubhubbub.appspot.com/

When it comes time to subscribe via the debuger the field verify type offers 2 possibilities:

Unfortunately the section 5.2 subscription validation from PubSubHubbub Core 0.4 -- Working Draft doesn't give details about the verify type.

Does sync/async make any difference for the callback script when sucribing to a feed via pubsubhubbub ?

score 0 · Accepted Answer · answered Jan 22 '14 at 13:52

PubSubHubbub 0.4 brings many updates and enhancements.

Among them:

Anf for information:

*hub.verify_token, permanent subscriptions and Hub-initiated subscription renewals have been also removed.*

Answer: It makes no more difference now, just use async as verify type.

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