java - Google App Engine authentication using OAuth -

there lot of forums , samples out there, of them either outdated or not understandable.

i understand authenticate requests appengine need log in google account using accountmanager, token using googleauthutil.gettoken, authcookie, , whatever want on appengine using token.

now, last 2 parts ones don't understand:

1. what authcookie? need new 1 every launch? temporary "permission" request authenticated requests appengine? first token received permanent 1 or should new 1 every launch too?

2. my current request "endpoint.list().execute()". authentication comes in here? i've seen lot of weird http request samples none of them used appengine endpoints.

i'm sorry if it's basic stuff started using appengine , couldn't find clear explanation on how works beginning end.

thank you.

since using endpoints, have read this?

https://developers.google.com/appengine/docs/java/endpoints/consume_android#making-authenticated-calls

it up-to-date , think reasonably clear (and includes sample).

i believe nature of oath need new token every session.