"Sessions" with Google Cloud Endpoints

Question

This question is only to confirm that I'm clear about this concept.

As far as I understand, Google Cloud Endpoints are kind of Google's implementation of REST services, so that they can't keep any "session" data in memory, therefore:

• Users must send authentication data with each request.
• All the data I want to use later on must be persisted, namely, with each API request I receive, I have to access the Datastore, do something and store the data again.

Is this correct? And if so, is this actually good in terms of performance?

Answer 1

Yes you can use session, only put another Paramether in your API method with HttpServlet:

@ApiMethod
public MyResponse getResponse( HttpServletRequest req, @Named("infoId") String infoId ) {
    // Use 'req' as you would in a servlet, e.g.
    String ipAddress = req.getRemoteAddr();
    ...
}