Disable default domain https://[project-id].appspot.com of Node JS on Google App Engine

Question

I have deployed my Node JS app onto Google Cloud App Engine, and I can successfully add my custom domain for my app.

Let say my custom domain is example.com

Answer 1

You can do it just using the dispatch.yaml file from App Engine, list all your domains there, but not the *.appspot.com one. Google will show a 404 route when you try to access that.

EDIT: Not possible anymore, check comments.

Checkout the official reference.

Answer 2

After considering GAEfan suggestion, I have made some change on the router logic. If the host name is ended with "appspot.com" and the user agent is included "AppEngine-Google", it will redirect to my custom domain.

router.get('/', function(req, res, next) {
    if(req.get("host").endsWith(GOOGLE_APP_SPOT) && 
        req.get("User-Agent").includes(GOOGLE_USER_AGENT))
    {
        var redirectURL =  url.format({
            protocol: req.protocol,
            host: CUSTOM_DOMAIN,
            pathname: req.originalUrl
        });
        res.redirect(redirectURL);
    }

    res.render('templateName', viewModel);
});

Answer 3

You cannot disable that default domain. You would have to write a redirect script. You can test for "appspot" in the request's HTTP_HOST, and test for "AppEngine-Google" in the request's HTTP_USER_AGENT, to determine if it is an internal request.

Also, internal functions, like cron jobs and task queues, run on that domain, so be careful what you do. Task queues will fail given a 301.