Re: [pubsubhubbub] Is PuSH 0.4 the spec to work to?

[Percy Baker]

remove from your email loist,

sggjb...@gmail.com

Percy Baker

On Thu, May 16, 2013 at 4:24 PM, James Clemence <ja...@jvc26.org> wrote:

I'm just working on a project which is based around PuSH, and was keen to know what the current spec is that the appspot hub works to? Is 0.4 now considered the defacto standard (whilst still a working draft?) or do people work to 0.3? - I notice some of the old implementation has been scrapped between 0.3 and 0.4 (read sync/async, the generally defunct verify_token parameter etc. and wouldn't want to start work on something which wasn't yet mainstream!

Thanks!

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[Roman]

Hi James,

Yes, the 0.4 spec is the de facto standard. We are going to make an announcement some time in June.

The Google hub still supports the 0.3 spec for backward compatibility.

Roman.

[James Clemence]

On Friday, 17 May 2013 11:24:01 UTC+1, Roman Perepelitsa wrote:

Yes, the 0.4 spec is the de facto standard. We are going to make an announcement some time in June.

The Google hub still supports the 0.3 spec for backward compatibility.

Excellent - thanks for your help! 

Are there any features which are considered particularly important in the transition phase to support between the two, or would you recommend just coding to 0.4?

Thanks 

[Roman]

My apologies for the delay in response.

The most robust approach is to only use features that exist in both 0.3 and 0.4 specs. For example, don't use "sync" subscription requests because 0.4 doesn't have them and don't reject distribution requests from the hub if they don't have the Link HTTP header because 0.3 doesn't have them.

In short, follow the robustness principle: Be conservative in what you send, be liberal in what you accept.

Roman.