code: def user_agent():
      
      client_name = 'unknown_client_name'
      try:
          client_name = os.environ.get("EDX_REST_API_CLIENT_NAME") or socket.gethostbyname(socket.gethostname())
      except:  # pylint: disable=bare-except
          pass  # using 'unknown_client_name' is good enough.  no need to log.
      return "{} edx-rest-api-client/{} {}".format(
          requests.utils.default_user_agent(),  # e.g. "python-requests/2.9.1"
          __version__,  # version of this client
          client_name
      )
docs: Return a User-Agent that identifies this client.
  
      Example:
          python-requests/2.9.1 edx-rest-api-client/1.7.2 ecommerce
  
      The last item in the list will be the application name, taken from the
      OS environment variable EDX_REST_API_CLIENT_NAME. If that environment
      variable is not set, it will default to the hostname.