Sending a DM via https://api.twitter.com/1.1/direct_messages/new.xml returns …
Http: 404 <error code="34">Sorry, that page does not exist</error>
Messages sent via https://api.twitter.com/1.1/direct_messages/new.json function properly.
We noticed this error last week. Prior to the error we used https://api.twitter.com/direct_messages/new.xml which began to error assuming due to the api being updated. When updating to the 1.1 api we found that the xml request was not supported.
Is this a bug? Or will all requests lose support for a xml response?