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I was sent this notice by the Flickr Team:
Upcoming changes to Flickr’s API.
Hello, Flickr API users and developers!
We’ll be making a change to the API soon, and we wanted to give you time to prepare and test your apps before it goes live.
Put simply, we’re adding a requirement for a “User-Agent” header on all API calls. We aim to make this change in the next month and will run some public testing windows to allow developers to test while minimizing disruption.
If you have an app or API client to test, please join us in the Flickr API Group to learn more and ask any questions you have.