Do all my future users need a google account to access my web app hostet via GAE?

Question

Total GAE beginner here.

Maybe total obvious answer. Maybe so obvious that I was not able to get a clear information via search because nobody spend even a single thought on it.

I just uploaded my first test app into GAE and in order to access it I need to login with my google account.

Why is that? If I want a login logic for my app, I will implement one by myself?

And if I do implement a custom auth mechanism: What is the user experience? Do a user need to first login into his google account and then into my app?

Do all my future users need a google account to access my web app hostet via GAE?

Clarification would be much appreciated.

EDIT:

Switch to "Federated Authentication" shown here to deactivate the google login screen.

Answer 1

This is clearly shown in the google gae documentation. Even a google search about 'google appengine user authentication' shows in the 1st result: https://developers.google.com/appengine/articles/auth