Comment 1 for bug 527681

This is harder than initially thought, because every time we ask for a URL from 7d we get back an oauth-signed URL, which means that every time we ask the URL we get back is *different* (oauth_timestamp, oauth_nonce, and oauth_signature all differ), and the URLs aren't cacheable. So it's not just a case of resubmitting the amqp message with the same URL.