code: def verify_request(self, uri, http_method='GET', body=None, headers=None,
                         scopes=None):
          
          request = Request(uri, http_method, body, headers)
          request.token_type = self.find_token_type(request)
          request.scopes = scopes
          token_type_handler = self.tokens.get(request.token_type,
                                               self.default_token_type_handler)
          log.debug('Dispatching token_type %s request to %r.',
                    request.token_type, token_type_handler)
          return token_type_handler.validate_request(request), request
docs: Validate client, code etc, return body + headers