[YouTube-API] Trouble with Pubsubhubbub

Hello,

I am trying to implement the Pubsubhubbub process for Youtube. We want our blogger being able to get their  video on their blog near of Real Time.
It's not the first time I use Pubsubhubbub process.

I have developed all the process for the https://pubsubhubbub.appspot.com hub:
- Register the callback for the feed. Ex : https://gdata.youtube.com/feeds/api/users/xkobal/uploads?v=2&max-results=1
- Youtube send me the callback, and I'm responding 200 and display the challenge
- I can check that everything is ok, thanks to Subscriber Diagnostics on this page: https://pubsubhubbub.appspot.com/subscribe
- I post a video on my account (xkobal) => Google make a POST request on my callback, I respond 200.

At this point, everything seems to be ok.

But, 5 minutes later, I had a video on my account, I never receive the POST request on my Callback.
And the strangest thing, is that if I use the Publish test on that page "https://pubsubhubbub.appspot.com/publish" with my feed (https://gdata.youtube.com/feeds/api/users/xkobal/uploads?v=2&max-results=1), Youtube send me the POST request and everything works fine.

So I ask myself what I am missing, what can be my problem ?

Thanks for your help.

Best regards.

Xavier

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