How to download a Private gallery image
I have oauth 1.0a functioning. I can get the list of galleries and images in a private gallery. However I cannot seem to actually GET an image from a private gallery. In my IOS app i am returned an authentication challenge. On the original GET request I have include the Authorization header with oauth_token, oauth_nonce, oauth_signature, oauth_consumer_key, oauth_timestamp, oauth_version, oauth_signature.
Am I missing something obvious? The fact that oauth works well enough to list the gallery contents is encouraging, but I don't understand what I am missing on the actual image download.
Galleries that are marked simply as unlisted download fine.
Any help appreciated.