What I was unsuccessfully trying to lead you to (my fault) was, that even if you have the right proxy values, $response does not contain what you think, and especially, that $ua->get() does not know what to do with the value contained in $response.
So, consider now putting your proxy code back in to see if the Flickr API works with the proxy or not, just to see if what you think the problem is (the proxy) actually is the problem (it isn't. Your usage of LWP::UserAgent is the problem).
In reply to Re^5: Flickr::API and using a proxy
by Corion
in thread Flickr::API and using a proxy
by zmerlinz
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