Creating and destroying favorites has always worked well in my iPhone Twitter client, but recently I'm getting a 401 for those calls. I'm making a POST request to https://api.twitter.com/1/favorites/create/ID.xml?include_entities=true (where ID is obviously the tweet's ID) using XAuth for authentication. It returns 401. I double-checked the documentation, but it all looks ok. All other API calls work fine. Any thoughts what could be wrong?
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