GAE/J: How do I POST a Multipart MIME message from appengine to facebook

Question

I want to post a photo (stored in appengine db) to facebook.

To test I\'ve got the basic understanding down locally: I\'ve been successful with this for

Answer 1

Solved!

I needed to add:

connection.addRequestProperty("Content-length", mpEntity.getContentLength()+"");
connection.addRequestProperty(mpEntity.getContentType().getName(), mpEntity.getContentType().getValue());

Also changed:

MultipartEntity mpEntity  = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);

Hope this helps someone