Comments on draft PubsubHubbub 0.4

Hello Julien, all,

I have been reading the 0.4 draft [1] and do believe that the generalization work to any content is definitely a major cornerstone of the spec. Here are some additional comments:

*         Why not allow support for Server-Sent Events according to EventSource spec [2]. This would allow (mobile) web applications to easily use the PuSH infrastructure and enlarge the scope of the spec whilst still keeping its spirit of decoupling publishers from subscribers and avoiding application-logics (publishers) to deal with subscribers & long-lived connections... In other words, one could say that a hub SHALL/SHOULD support text/event-stream type of subscription with no need for hub.callback parameter in the subscription (thus becoming OPTIONAL). Request for such an output could be indicated using the Accept: header. Intent verification could be skipped and this may slightly impact other sections as well...

*         Section 6 is now nearly empty. Why not keeping "at least" the 0.3 publication mechanism? Then one could obviously say that others may be supported but this would ensure interoperability between publishers and hubs (at least for public content). What is the rationale for abandoning this mechanisms as default?

Some minor comments/typos:

*         In section 4, the last sentence of the first paragraph should proabbly read "the latter" instead of "the former"

*         Still in section 4 i have not clear the purpose of the "example" part. Is it the intention to have the related text as informative only? Or is a true example (some example uris) missing?

*         In section 7, "MUST not" should read "MUST NOT" probably

In general, why not move this draft proposal to w3c pubsub website? Also, 0.3 is quite stable now so the community knows that the related text/draft doesn't vary but as I understand it 0.4 is actually in very alpha stage (for comments) and in case it should evolve over time with the same release number this should be clearly mentioned (note that the "stable" 0.3 still mentions "working draft")

I'd be happy to get your feedback on these points.

thanks
walter


[1] http://superfeedr-misc.s3.amazonaws.com/pubsubhubbub-core-0.4.html
[2] http://dev.w3.org/html5/eventsource/
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