def get_document(user_name, intra_hash, file_name)
      response = @conn.get get_document_href(user_name, intra_hash, file_name)
      if response.status == 200
        return [response.body, response.headers['content-type']]
      end
      return nil, nil
    end
def get_document(user_name, intra_hash, file_name)
      response = @conn.get get_document_href(user_name, intra_hash, file_name)
      if response.status == 200
        return [response.body, response.headers['content-type']]
      end
      return nil, nil
    end
Get a document belonging to a post.

 @param user_name
 @param intra_hash
 @param file_name
 @return the document and the content type