Sending a file throught a Post with HTTPBuilder in Grails

Question

I am developing a Facebook Application an i wanna send a video file from myServer to Facebbok User`s Timeline. This is the page with the explanation http://developers.facebook.com/blog/post/515/#video_upload but its a PHP code.

My app is on Grails, and im looking in HTTBuilder class but can't find a way to do this. Do someone know how to do it?

If isnt possible to do this with HTTPBuilder, in my app, i am using Spring Social Facebook Plugin on Grais I found the interface MediaOperations but i dont know how to use this interface and use the method postVideo to upload a Video.

Thanks!