code: def execute(self, command, data={}):
          
          method, uri = command
          try:
              path = self._formatter.format_map(uri, data)
              body = self._formatter.get_unused_kwargs()
              url = "{0}{1}".format(self._url, path)
              return self._request(method, url, body)
          except KeyError as err:
              LOGGER.debug(
                  'Endpoint {0} is missing argument {1}'.format(uri, err))
              raise
docs: Format the endpoint url by data and then request the remote server.
  
          Args:
              command(Command): WebDriver command to be executed.
              data(dict): Data fulfill the uri template and json body.
  
          Returns:
              A dict represent the json body from server response.
  
          Raises:
              KeyError: Data cannot fulfill the variable which command needed.
              ConnectionError: Meet network problem (e.g. DNS failure,
                  refused connection, etc).
              Timeout: A request times out.
              HTTPError: HTTP request returned an unsuccessful status code.