code: def document(self, document_id, **kwargs):
          
          baseuri = '{}document/{}/content'.format(self._DOCUMENT_URI,
                                                   document_id)
          res = self.session.get(baseuri, params=kwargs)
          self.handle_http_error(res)
          return res
docs: Requests for a document by the document id.
             Normally the response.content can be saved as a pdf file
  
          Args:
             document_id (str): The id of the document retrieved.
             kwargs (dict): additional keywords passed into
              requests.session.get *params* keyword.